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    Structural Analysis
  • Structural Analysis
    SSI Method Based Modal Identification of VFIFE Cable Network Model
    HUANG Jiasi, XU Wencheng, DUAN Yuanfeng, ZHANG Hongmei
    2022, 38(6): 1-6.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The vector form intrinsic finite element method （VFIFE） is suitable for analyzing and simulating the large deformation, nonlinear or discontinuous mechanical behaviors of the flexible structures effectively, without assembling the global stiffness matrix. As for that, the modal parameters cannot be solved by eigenvalues directly. In this paper, referring to the stochastic subspace identification （SSI）, the covariance based stochastic subspace Identification program （VFIFE-SSI） is nested in the VFIFE solver. The modal analyses of the twin-cable network and the different cables network VFIFE models are carried out respectively, and the modal frequencies, damping ratios and mode shapes of the cable network are obtained. The accuracy of the VFIFE-SSI method is verified by comparing the results of the analytical solution with the traditional finite element analysis results. Meanwhile, the results show that the stiffness and damping coefficient of the cross-ties will influence the modal parameters of the cable network, and the overall performance of the cable network can be adjusted by varying the cross-tie parameters in engineering.
  • Structural Analysis
    Performance of Socket Connections for Precast Bridge Columns Subjected to Axial Load
    LÜ Xinjian, LI Tao, LIU Duo, CHENG Zhao, ZHANG Jiandong
    2022, 38(6): 7-14.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To investigate the performance of socket connections for precast columns subjected to axial load, through the nonlinear three-dimensional numerical approach, this paper introduced the details of the designed models and studied the effects of column embedment length, column surface texture, and grout strength on the connection performance. The results indicated that：the ABAQUS numerical model with the surface contact algorithm adequately captured the structural behavior of the socket connections;the specimen with round foundation and confining steel tubes was adequate to fully exercise the axial performance of socket connection; increasing of column embedment length increased the strength of the socket connection in a linear relationship, whereas it had negligible effect on the side shear stress of the socket connection; the socket connections with different column surface texture exhibited comparable axial performance; the connection strength was increased by only 11.4% with increasing the compressive strength of grout from 40 MPa to 80 MPa.
  • Structural Analysis
    Embedding Effect of Flange Restraint on Elastic Shear Buckling of Corrugated Steel Webs
    ZHANG Boshan, YU Jiangjiang, CHEN Weizhen
    2022, 38(6): 15-22.
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    Existing design and evaluation formulas for shear behavior of corrugated steel webs are mainly based on analyses of simply-supported corrugated plates or corrugated steel webs in I-beams with specific flanges, which could not refeclt the influence of flange constraint on shear buckling. Elastic shear buckling is the important basis for shear behavior of corrugated steel webs. In this paper, the elastic shear buckling behavior of 9 groups of four-edge simply-supported corrugated plates and 63 groups of I-beams with corrugated steel webs were simulated by the finite element analysis software ANSYS, adopting the eigenvalue buckling analysis. The models were divided into 9 series according to the web profiles. Based on the parametric study of flange dimentions, flange restraint and its influence on elastic shear buckling stress of corrugated steel webs were explored. The coefficients to describe the flange constraint level and the embedding effect were proposed. The results showed that the flange restraint had embedding effect on elastic shear buckling of corrugated steel webs, thus the elastic shear buckling stress of the corrugated web in an I-beam was higher than that of a simply-supported corrugated plate.
  • Structural Analysis
    Numerical Simulation on Water Filling Process of Steel Truss Aqueduct and Its Structural Response
    CHANG Haocheng, WU Zhigang, CHEN Airong, YIN Liang, MA Rujin
    2022, 38(6): 23-29.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The Pi River steel truss aqueduct project is the first large steel truss aqueduct in China. Research on water filling process of this kind aqueduct is insufficient. Based on VOF （Volume of Fluid） and FEM （finite element method）, this paper conducts numerical simulation of the process of aqueduct water filling and the dynamic response of the structure during the process. Firstly, VOF method is used to simulate multiphase flow in the process of water filling at different gate opening heights, and then the results are transformed into two different load patterns： static load and dynamic load, which are applied to the structure to obtain the structural response. The results obtained by the two methods are compared.
  • Structural Analysis
    Fatigue Mechanism Analysis of Orthotropic Steel Decks with Hot Rolled Thickened U Ribs
    SHENG Rongrong, LIU Yuqing, DONG Xiaoqiang, CHEN Airong
    2022, 38(6): 30-37.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    As an attempt to improve the fatigue performance of orthotropic steel decks, hot rolled thickened U ribs are largely used for the first time in the cross-sea steel box girder bridge of Xiamen Second East Passage. To clarify the fatigue mechanism of the novel bridge deck with hot rolled thickened U ribs jointed to deck plates by double-side welding, local models of orthotropic steel deck are built using ANSYS. Fatigue performance assessment of orthotropic steel decks with hot rolled thickened U ribs and U ribs with the thickness of 8 mm is implemented by the structural hot spot stress approach, and the stress history, range and distribution of fatigue details under wheel loads are analyzed. The results indicate that the hot spot stress of fatigue details with hot rolled thickened U ribs shows the similar fluctuation to that with 8 mm U ribs.For the orthotropic steel deck with hot rolled thickened U ribs, the hot spot stress amplitudes at the weld toe of the deck plate at the U rib to deck and diaphragm joint and the U rib at the end of U rib to diaphragm joint are reduced by 19% and 20% respectively, and the stress concentration at the U rib to deck and diaphragm joint is alleviated.
    • Earthquake and Wind Resistance
  • Earthquake and Wind Resistance
    Seismic Performance of Reinforced Concrete Beams Corroded by Chloride
    JIANG Huanjun, CHEN Shang, LIU Bangyu
    2022, 38(6): 38-43.
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    To study the effects of chloride erosion on the seismic performance of reinforced concrete （RC） beams, the finite element models of 120 RC beams corroded by chloride were established by using the numerical modelling method which was validated. The effects of corrosion ratio,shear-span ratio, longitudinal reinforcement characteristic value, stirrup ratio and concrete strength on the seismic performance of RC beams with chloride erosion were analyzed. Based on the numerical simulation results, it can be concluded that the corrosion ratio has an important effect on the failure mode of RC beams with chloride erosion. Both longitudinal reinforcement characteristic value and shear-span ratio affect the deformation performance of RC beams with chloride erosion significantly. The research results can be utilized for the life-cycle oriented seismic performance evaluation and design of RC structures.
  • Earthquake and Wind Resistance
    Research on Seismic Performance of Concrete Frame Supported by Buckling Restrained Braces Based on Stiffness Ratio Design
    HU Dazhu, TAO Linjie, YANG Zhenqiao
    2022, 38(6): 44-54.
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    To study the influence of stiffness ratio on the performance of buckling-restrained brace-concrete frame structural systems and its likely reasonable value range, three concrete frames with different initial storey drifts are designed and analyzed respectively. By means of dynamic time history analysis of frequent earthquakes and rare earthquakes, the influences of different stiffness ratios on seismic performance of the frame structure, such as the inter-storey drift angle, inter-storey shear force, hysteretic energy dissipation ratio of bracing, plastic damage distribution, etc. Based on the analysis results, the likely suitable stiffness ratios are proposed for structures with different initial drift angles.
  • Earthquake and Wind Resistance
    Analysis of Shanghai Acceleration Signal of 12·22 Changzhou Earthquake with Magnitude of 4.2
    REN Xiaosong, ZONG Gang, ZHOU Qiushang
    2022, 38(6): 55-62.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    On Dec.22,2021, an earthquake with magnitude of 4.2 occurred in Changzhou, Jiangsu Province, which is sensible in Shanghai. The field-structure seismological array,which is recently established at different campuses of Tongji University, got the efficient acceleration signal of this earthquake. The peak ground and building acceleration of five stations are in the range of 1-5 cm/s2 and 1-6 cm/s2 respectively. By comparative analysis of the field and building signal in time and frequency domain, the peak ground acceleration, response spectrum of ground signal along with the dynamic characteristic of the building signal were studied. The influence of the earthquake on Shanghai is relative sensible to low buildings of short natural period. Rapid intensity assessment by field and structure signal is discussed and the intensity of different campus is 1 to 3.
  • Earthquake and Wind Resistance
    Simulation Analysis of Sudden Loading Response and Influence Factors of Non-Structural Element Based on VFIFE
    WU Zehan, ZHANG Hongmei
    2022, 38(6): 63-74.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    With the application of vector form intrinsic finite element method, it shows excellent prediction results for large deformation and non-continuous problems. Aiming at the near fault response of the main non-structural member-large suspended chandelier, which is not getting the attention it deserves. In this paper, the vector form intrinsic finite element method is used to analyze the influence of simulation parameters on the response of multi-mass large suspended chandelier under sudden loading. The effects of different sudden loading modes and damping ratios on the vibration of multi-mass large suspended chandelier are discussed. The results show that the loading mode affects trajectory of the structure, and the change of damping ratio affects the speed of the structure vibration to the equilibrium position. This research can provide a reference for practical design and application of multi-mass large suspended chandeliers.
  • Earthquake and Wind Resistance
    Comparative Study on Vibration Characteristics and Dynamic Response Analysis Methods of Deep Water Circular High Pier Structure
    YANG Kun, GE Shuxun
    2022, 38(6): 75-83.
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    The hydrodynamic added mass of the pier body has a great influence on the vibration characteristics and seismic dynamic response of high pier structures in deep water. To study the application scope of the hydrodynamic added mass calculation methods, a dynamic analysis model of circular high pier structure in deep water is established by using the finite element software ADINA, which is based on the fluid-solid coupling full numerical method of potential fluid element and the hydrodynamic added mass method based on Morison equation.By comparing and analyzing the vibration characteristics and seismic response of these two models, the accuracy and application scope of the hydrodynamic added mass model are discussed. The results show that the ratio of depth to width has a significant influence on the accuracy of vibration characteristics and seismic response of high pier structure in deep water calculated by the hydrodynamic added mass model, and reasonable control of the ratio of depth to width can ensure the accuracy of the hydrodynamic added mass model.
  • Earthquake and Wind Resistance
    Study of Influence of Pile Driving on Environmental Vibration of Building Structures
    CHAO Yan, SONG Xiaodong, HUANG Jiangtao
    2022, 38(6): 84-91.
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    To investigate the vibration characteristics of structures induced by pile driving, a field test is conducted and the frequency spectrum is studied. The dynamic response of the soil is predicted by using the finite element model and transient analysis, which is validated by combination of the measurement. The finite element model of the building and high-speed railway bridge is developed, and the influence of pile driving on structures is evaluated. The research shows that： （1） The frequency range of soil vibration induced by pile driving is from 3 to 30 Hz, with the peak frequency around 10 Hz. （2） The dynamic response of the soil at the location of the vibration source shows obvious pulse attenuation characteristics. The acceleration level of the soil attenuates rapidly with the increase of field test point. No obvious pulse attenuation behavior can be observed at the location of 60 m away from the vibration source. （3） The peak particle velocities at the foundation and top floor of the building are 2.7 mm/s and 6.6 mm/s, respectively. The maximum transverse amplitude and vertical acceleration at the mid-span of the high-speed railway bridge are 0.023 mm and 0.144 m/s2, respectively, which are less than the limit value proposed in associated guidelines.
  • Earthquake and Wind Resistance
    Development of GUI Program for Parameters Identification of MR Damper Based on Least Square Method
    LI Xin, ZHANG Ying
    2022, 38(6): 92-100.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    When utilizing magnetorheological （MR） damper in structural control, one of the challenges is the development of effective control algorithms and control law based on available feedback measurements. To develop control algorithms that take maximum advantage of MR damper, high fidelity model must be developed that can adequately characterize the damper’s nonlinear behavior. First, a brief review of four idealized models for MR damper is introduced, including Bingham model, modified Bingham model, Bouc-Wen model and phenomenological Bouc-Wen model, and the advantages and disadvantages of these models are discussed. Secondly, based on the mechanical characteristic test of the MR damper, three models are selected for Simulink modeling and simulation analysis. The analysis indicates that the phenomenological Bouc-Wen model fits well for the performance of the magnetorheological damper. A tool of parameter identification for phenomenological MR damper model is developed based on nonlinear least square method by using the Simulink GUI graphical interface in Matlab. Moreover, identification results and curve fitting results are verified with experimental data. The identification results show that the fitting results and the test data are in good agreement, and the system identification tool meets the requirements which has good practical application value.
    • Experiment Study
  • Experiment Study
    Behavior of Thread-Fixed One-Side Bolted Connection under Bending Moment and Shear Force
    JIANG Xiaoming, WANG Guangwei, ZHANG Man, TANG Liru, WANG Peijun
    2022, 38(6): 101-110.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The existing researches on thread-fixed one-side bolted connections are simple, generally pure bending, pure tension, and pure shear. There is an obvious relationship between the bending and shear bearing capacity of the practical structural connections, so it is necessary to study the structural performance and calculation method of the connections under the combination of bending and shear. This paper conducted experimental research on the influence of bending moment and shear force on the mechanical performance of the thread-fixed one-side bolts bolted joints and traditional nut-fixed double-sides bolted connections for comparison. Parametric analysis of thread-fixed one-side bolts bolted joints under bending moment and shear force was carried out utilizing finite element model verified by the test results. The influence of shear force against bending performance was discussed, meanwhile, the interactive relationship between bending and shear capacity was drawn. The results show that the deformation of the screwed bolt hole caused by shear force will further weaken the anchor effect of the threads, and then reduce the tensile strength of the connection. Therefore, the shear force has a greater influence on the connection bearing capacity than the tensile force.
  • Experiment Study
    Research on Centrifugal Model Test of Different Arrangement of Double-row Piles Retaining Structures
    LIAO Zhijian, LÜ Qi, WU Yue
    2022, 38(6): 111-118.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Due to its unique mechanical characteristics, the arched double-row pile supporting structure can convert the external load it receives into its own axial force, thereby giving full play to the compressive performance of concrete materials. This new type of supporting system is gradually being promoted and applied in engineering practice. However, the mechanism of arched double-row piles is much complicated, and the relevant researches are lags far behind engineering practice. Based on the actual foundation pit engineering, the centrifugal model test is used to compare the force and deformation laws of the straight and arched double-row piles retaining structures. The test results show that the two are more consistent in the law of bending moment of the pile, the law of horizontal deformation and the law of settlement of the soil behind the pile, but the arched double-row piles retaining structures are more conducive to the deformation control of the foundation pit; The maximum positive and negative bending moment and horizontal deformation of the double-row piles at the center are larger than those of the double-row piles at the arch foot. The results can provide experimental reference for similar engineering design and theoretical research.
  • Experiment Study
    Wind Tunnel Test for Wind Loads of an Angle Steel Transmission Tower Head under Skew Winds
    LI Chao, HU Xiaoyi, SONG Xueqi, DENG Hongzhou
    2022, 38(6): 119-125.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    A wind tunnel test was carried out for the tower head of an angle-steel transmission tower in the Zhundong-East China ±1 000 kV UHV DC transmission line. The technique of high frequency force balance was employed to study the aerodynamic characteristics of the tower head model under skew winds. Through the indirect force measurement method, the aerodynamic coefficients, skew wind load factors and load distribution factors of the two cross-arms were obtained, respectively. The results reveal that, under skew winds, the most unfavorable condition for the drag coefficient of a cross-arm is wind direction 10°, and the most unfavorable condition for lift coefficient is 30°; the skew wind load factors of the two cross-arms in a tower head are close under wind direction 0°~75°, while under wind direction 75°~90°, the skew wind load factors of the downstream cross-arm are obviously smaller than those of the upstream cross-arm; the load distribution factor should not be obtained directly by decomposing the skew wind load factor according to the wind direction, the effects of lift should not be neglected; based on the test results, fitting equations of the skew wind load factor were proposed, which can provide references for practical engineering designs.
    • Foundation
  • Foundation
    Research on Design of Pile Foundation under the Large-Span Truss of a Subway Superstructure Project in Shanghai
    SUN Shuyu, WANG Jingyu
    2022, 38(6): 126-133.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Subway superstructure projects generally have the characteristics of limited site and strict foundation settlement control, which brings great challengers to structural design. What is more, in this project, large-span trusses are used to span the subway station, so the design of the pile foundation under the truss system is much more difficult because of the concentration of the load under the truss. To solve the problem that the pile spacing does not meet the code requirements due to the restricted site, this project adopts a new method to consider this adverse condition. The new method calculation results show that the shaft resistance bearing capacity of the pile foundation can still meet the design requirements after being reduced. The main reasons for the settlement of this project are analyzed. Based on the data such as the test pile results of similar projects, the settlement data is researched and estimated. Research shows that the main reason for the settlement of the cast-in-situ pile comes from the compression deformation of the pile body, the settlement of the pile foundation under the large-span truss is very small, which can meet the requirements of the subway settlement limitation. The number of piles under the truss is limited because of the restricted site, the horizontal bearing capacity of the pile foundation is insufficient, therefore, a horizontal force transfer plate is installed on the cap to solve the problem of the excessive horizontal force.
  • Foundation
    Degree Classification for Defective Underwater Pile of Bridge
    ZHANG Peixu
    2022, 38(6): 134-143.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In view of the related grading standards for assessing the damage degree of underwater pile foundations of bridges in our country, there are still some shortcomings such as the difficulty of quantifying the assessment indicators, the inconsistent grading scale, and the strong subjectivity of the division process. This method unifies the classification scale of common defects of bridge underwater pile foundation into 5 levels, and uses the finite element calculation data as the analysis basis for determining the interval range of each scale, so as to enhance the objectivity of disease classification and assessment. This paper firstly uses the finite element software ABAQUS to study the impact of six common diseases of underwater pile foundations on the horizontal bearing capacity of bridge pile foundations. Secondly, according to the finite element calculation results, the damage degree of different diseases is unified to five continuous intervals based on the class correlation discretization idea. Finally, comparing with the disease grading evaluation standard given by the existing regulations, the correctness and scientificity of the method for determining the disease grading evaluation standard proposed in this paper are verified, which lays the foundation for the safety assessment of bridge underwater pile foundation.
    • Engineering Construction
  • Engineering Construction
    Translocation Monitoring System of Xiamen Houxi Bus Station： Design and Implementation
    XIE Liyu, GUAN Shuai, LU Wensheng, LAN Wuji, SHU Xuezhi
    2022, 38(6): 144-151.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In order to ensure the safety of the bus station during the process of translocation of Xiamen Houxi long-distance bus station, the whole houses were monitored by the translocation monitoring system. First of all, a brief introduction of Xiamen Houxi long-distance bus station translocation construction scheme and the main technical process was introduced. Then, the site installation scheme of Xiamen Houxi long-distance bus station translocation monitoring system was illustrated, and the positions of each sensor installed on site were explained. Finally, the sensor data of the whole process of the translocation were analyzed and summarized. The results show that the translocation of Xiamen Houxi long-distance bus station is stable, the sensors have no abnormal data, and the structure is in a safe state during the translocation process. The monitoring plays a demonstrational and promotional role for the monitoring system design of the translocation project, and has certain reference significance.
  • Engineering Construction
    Analysis of Construction Mechanical Properties of Novel Large-Span Steel-Concrete Transfer Truss of High-Rise Building During Construction Stage
    LI Ziyun, GUO Mengtao, LI Yunfu, LI Shengli
    2022, 38(6): 152-160.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The large-span steel-concrete transfer layer truss is a novel conversion form of high-rise building structure. Monitoring and analyzing the mechanical properties during construction is critical to the safety of high-rise buildings. Real-time monitoring and numerical simulation technology were used in combination to analyze the mechanical characteristics of the large-span steel-concrete transfer layer truss of high-rise building during construction stage. In terms of displacement and stress as indicators, the consistency between the real-time monitoring values and the numerical simulation results is assessed and verified. In addition,the mechanical properties of the novel large-span steel-concrete transfer layer truss were presented. The results show that during the construction process, the stress and displacement values in each structural member of the conversion layer truss captured by real-time monitoring and derived from the numerical simulation meet the requirements of the specification and have a great safety margin; the higher the construction floor level, the smaller the influence of the vertical load on the truss stress and displacement; during the scaffold dismantling stage, vertical deflection would occur in the transfering truss.The finite element method can be used to evaluate the mechanical properties of the new large-span steel-concrete conversion layer truss.
  • Engineering Construction
    Study on Simultaneous Construction of Main Body and Accessory of Station and Treatment of Water Leakage at Joint
    WANG Peng, RUAN Yongfen, ZHU Qiang
    2022, 38(6): 161-167.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The construction of regular subway station points is the first excavation of the main structure foundation pit,After the main structure is completed and capped, then the subsidiary structure foundation pit excavation, which will greatly lengthen the construction cycle, but also cause the main foundation pit part of the structure of the secondary excavation and secondary support cost increased. The soil layer of the Dianchi lacustrine sedimentary stratum is relatively special, which is soft soil with poor engineering properties and high sensitivity. To avoid excessive disturbance of surrounding soil caused by secondary excavation and save the construction period, the construction technology of simultaneous construction of main body and auxiliary structure foundation pit is explored. Based on Kunming Metro Wujiaba station project, the construction technology of excavation of main structure and auxiliary structure simultaneously in a lacustrine soft soil area. This construction method, construction procedure, construction technology, and measures to implement joint deformation after the seam displacement and seepage problems are studied, and combined with the monitoring data of the cause of the problems are analyzed, and targeted treatment measures were taken to ensure the safety of engineering, can be as the main body in the subway stations and affiliated construction provides a new technology measures, It also provides a reference for similar engineering analysis.
  • Engineering Construction
    Research on Construction Simulation and Cloud Monitoring Technology of Steel-Reinforced Concrete Complex Joints in Bearing Layer of the Zhengzhounan Railway Station
    CHEN Wentao, WANG Jingfeng, YU Qijun, SU Hang
    2022, 38(6): 168-175.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The Zhengzhounan Railway Station is one of the four comprehensive transportation hubs in Zhengzhou, the “heart of China Railway”. The supporting rail layer adopts a section steel concrete structure. The section steel and joints of this structure are complex and diverse in types. The total scale of the project yard is 16 sets and 32 lines, and the construction site environment is complex. In this paper, a refined BIM model is established for the steel reinforced concrete （SRC） complex joints in Zhengzhou South Railway Station, and the construction process is simulated. A cloud platform data processing and real-time monitoring system is developed. The location of monitoring points is determined reasonably, and the monitoring data is compared with the simulation value. The results show that the BIM model established in this paper can show the construction technology of key complex joints in a virtual and dynamic way; The monitoring results of the cloud platform data processing and real-time monitoring system in this project meet the expectations, which provides a strong guarantee for the construction safety.
    • Study of Design Method
  • Study of Design Method
    Design and Analysis of Economic Parameters of Simply Supported Precast Channel Steel Concrete Composite Beam for Urban Viaduct
    WANG Qingquan, ZHAO Wei, Su Qingtian
    2022, 38(6): 176-184.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In order to rationally design simply supported precast channel steel concrete composite beam for urban viaduct, structural design factors such as mid-span cross-beam layout, cross-section layout （number of main beams）, beam height, and bridge deck width were selected, and various parameters were set. The calculation and analysis of the determined composite girder bridge deck and steel girder slabs have resulted in the following conclusions： ① Under the premise of meeting the structural stress requirements, the installation of the mid-span beams will slightly increase the cost and affect the construction speed and landscape performance. Only the end beams can be installed; ② Generally, the arrangement of large openings and fewer beams is more cost-effective than the arrangement of small openings and multiple beams; ③ The economic beam height of the 30 m span composite beam is 1.6~1.8 m, the 35 m span economic beam height is 1.8~2.2 m, and the 40m span economic beam height is 2.0~2.4 m。
  • Study of Design Method
    Calculation Method of Load Lateral Distribution Coefficient of I-Beam with Deviated Pretensioning Method and Design of Cross-Girder
    ZHANG Zheyuan, LIN Ying, WANG Jianhui, DENG Qinger, ZHANG Kegan
    2022, 38(6): 185-191.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The deviated pre-tensioned girder with discounted reinforcement avoids the shortcomings of post-tensioned prestressed concrete girder in tunnel construction technology and durability, and improves the mechanical adaptability of prestressed concrete structure, so it has a broad application prospect in bridge engineering. In practical engineering, the concept of load transverse distribution coefficient is often used to simplify the spatial multi-beam system into single beam system for analysis and calculation. However, with the increase of span, bridge width and the adjustment of beam spacing, this simplified calculation method will have a significant impact on the spatial stress state of the actual structure. Therefore, this article established the three-dimensional finite element model of I-beam, this paper studies force behavior of I-beam, through comparing all kinds of load transverse distribution coefficient calculation method and the error of the actual space force, put forward the reasonable and applicable method by studying the transverse beam spacing on force of main girder space, put forward reasonable design reference.
  • Study of Design Method
    Structural Design of Zhanjiang Wuchuan Airport Terminal
    CHEN Jingyu, OU Tong, QIU Youwei
    2022, 38(6): 192-201.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In the structural design of Zhanjiang Wuchuan airport terminal, the following problems should be solved： In selecting the structural system of large-span and large-cantilever roofs, internal force analysis should be conducted. Under the safety of building use and structural force, the structural form should be economically reasonable. Prestressed pipe pile foundation and punched cast-in-place pile foundation are combined. It should try to save expense while meeting force requirements under different load conditions. Effective measures of design, materials selection, and construction should be taken to solve the problems in individual structures including overlength, high temperature stress and concrete shrinkage stress. Structural durability should also be satisfied in the design. By analyzing the fire resistance of the whole terminal roof based on the large space heating curve, the fireproof rule of large space roof grid structure should be obtained. The performance of different-position viscous camping bearings under wind-induced vibration should be evaluated. Some pertinent force analyses should also be taken specifically to assure the node performance. Therefore, it should guarantee the wind vibration reliability of the terminal in such an area of highly frequent strong typhoons.
    • State of the Art
  • State of the Art
    Research Progress of Fire Resistance Design Theory of High Strength Steel Structures
    OUYANG Hui, ZHENG Xiaofen, CHENG Hao
    2022, 38(6): 202-213.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    With the continuous refinement of metallurgical technology in recent years, more and more high-strength structural steel has been emerging, its excellent physical and mechanical properties make it quickly applied to related projects. Similar to plain steel, the problem of fire resistance of high-strength steel structure is still very prominent. In the past ten years, the research on the fire resistance of high-strength steel has also started, and this paper makes a systematic investigation and summary on the high-strength steel fire-fighting high temperature and post-fire mechanics performance, high-strength steel components and node fire resistance, and high-strength steel structure fire resistance, and finally discusses and looks forward to the problem of under-research. At present, the research on the fire resistance performance of high-strength steel structure is still in the preliminary stage, and studies have shown that the high-temperature mechanics and fire resistance of high-strength steel have different degrees of deviation from the existing domestic and foreign relevant codes, and cannot be directly used.