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    Structural Analysis
  • Structural Analysis
    Crack Detection Method for Cylindrical Members with Spatial Projection Restoration and Binocular Stereo Vision
    ZHANG Yudong, DING Lirong, PAN Zuanfeng
    2025, 41(2): 1-8. https://doi.org/10.15935/j.cnki.jggcs.202502.0001
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    A crack detection method for cylindrical members based on binocular stereo vision and spatial projection restoration is proposed. By this method, the image point of the crack edge on the image plane of the left camera is selected as the projection point, and the side surface of the cylindrical member is selected as the projection cylinder surface. Based on the obtained world coordinate of the projection point and the equation of the projection cylinder surface, the world coordinate of the actual crack edge point can be obtained by calculating the intersection of the line connecting the coordinate origin and the projection point and the projection cylindrical surface. In this way, the spatial shape of the crack can be restored, and further, based on this, the characteristic value of the crack can be detected. The method proposed can realize oblique photography of cracks, truly restore the original spatial shape and size of cracks, and improve the recognition accuracy of cracks. At the same time, this method only needs to perform binocular camera calibration once and perform stereo matching on a limited number of feature marker points based on their geometric features to obtain all the required calculation parameters. It has high computational efficiency, good matching effect, and the detection accuracy is not sensitive to illumination changes. This method solves the defect that the traditional 3D reconstruction technology based on binocular stereo vision is difficult to directly extract the crack boundary on the 3D point cloud of the structure surface, and is suitable for crack identification and parameter extraction of cracked surface of cylindrical members.
  • Structural Analysis
    Comfort Level Analysis of Column-Less Beam Spiral Steel Stairs
    LIU Jinhui, CAO Guozhen, CHEN Jianfeng, GAO Xiuxiu
    2025, 41(2): 9-17. https://doi.org/10.15935/j.cnki.jggcs.202502.0002
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Based on the pulsation method, the dynamic characteristics of a column-less steel spiral stair were tested, and the natural frequency and damping ratio of the steel stairs were obtained. Based on the test results, a numerical model was established to study the comfort and influencing factors of the column-less steel spiral stairs. The research results show that the comfort of the steel stair meets the requirements of the current Chinese design code. Change of the constraint conditions at the end of steel stairs and adjusting the stiffness of arc beams supporting them can significantly impact the comfort of column-less steel spiral stairs.In addition, in order to facilitate the design, based on the above analysis, an approximate calculation formula for the natural vibration frequency of the column-less steel spiral stairs was proposed, which can be used to estimate the natural vibration frequency of such steel stairs and predict the comfort level in the preliminary design stage. It provided some reference for the design and comfort analysis of similar stairs in future.
  • Structural Analysis
    Force Analysis of Double Flat Arm Holding Pole Waist Cable
    ZHAI Guanglin, LÜ Meng, WU Mingchun, SHI Wei, WANG Shuang, LIU Ling
    2025, 41(2): 18-26. https://doi.org/10.15935/j.cnki.jggcs.202502.0003
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The layout scheme of guyed pole waist ring cable has an important influence on the efficiency and safety of UHV transmission tower erection construction. In order to study and obtain an economical, reasonable, safe and reliable layout scheme of holding pole waist ring cable, according to the real size of GGTY2 × 7t / 16-1000 type landing electric rotating double flat arm holding pole, this paper uses the finite element analysis method to establish the holding pole-waist ring-cable coupling mechanical analysis model under the condition of UHV transmission tower assembly. The mechanical characteristics of holding pole and cable under different working conditions and different typical waist ring cable layout schemes are calculated. Through the analysis of the displacement of holding pole and the tension of cable, the optimal arrangement scheme of holding pole waist ring cable is obtained. The coupling calculation method and analysis conclusion of pole-waist-strut coupling obtained in this paper can provide technical support for UHV transmission tower assembly and improve the efficiency and safety of construction assembly.
  • Structural Analysis
    Simulation and Load-Bearing Capacity Calculation Methods for the Uniaxial Tensile Performance of Textile Reinforced Ultra High Ductile Cementitious Composites
    CHEN Yuyang, DOU Xiangxiang, JIANG Jiafei
    2025, 41(2): 27-39. https://doi.org/10.15935/j.cnki.jggcs.202502.0004
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    Textile Reinforced Ultra High Ductile Cementitious Composites （TR-UHDCC） are advanced materials characterized by high strength, high ductility, crack resistance, and durability. Compared to traditional masonry reinforcement materials, TR-UHDCC exhibits superior performance. Based on existing experimental research results, this paper introduces the Hashin damage criterion to account for the damage behavior of the fiber grid, establishing a three-dimensional finite element model for TR-UHDCC. This model accurately simulates the stress-strain curve of TR-UHDCC and its corresponding characteristic points （cracking stress and strain, peak stress and strain, ultimate stress and strain）. Using this model, the effects of fiber grid distribution rates and the tensile strength of UHDCC on the characteristic points of TR-UHDCC were studied. Finally, a theoretical calculation model for the tensile load-bearing capacity of TR-UHDCC was developed based on the sectional force equilibrium relationship. The calculated values from this model align well with experimental and parametric analysis results, with an average error of only 3.63%.
  • Structural Analysis
    BIM-based Parametric Modeling of Mortise-Tenon Joints in Traditional Timber Structure
    WANG Jiachen, DONG Jingliang, SONG Xiaobin
    2025, 41(2): 40-48. https://doi.org/10.15935/j.cnki.jggcs.202502.0005
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    Chinese mortise and tenon joints present significant historical and cultural value. Recently, BIM-based structural parametric design has been increasingly promoted and applied. Through the digital model, the entire life cycle of traditional structure will be recorded for their conservation. This paper summarizes the shape characteristics of typical mortise and tenon joints. Based on dimension feature, family templates of mortise and tenon joints were developed on the Revit platform, which improves modeling efficiency and accuracy.
    • Earthquake and Wind Resistance
  • Earthquake and Wind Resistance
    Influence of Ground Motion Selection Based on Conditional Mean Spectrum on Seismic Fragility Analysis of RC Frame Structures
    WEI Shilong, HAN Jianping, JIN Zhaoxin
    2025, 41(2): 49-58. https://doi.org/10.15935/j.cnki.jggcs.202502.0006
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    Ground motion spectral shape characteristics have a great importance to analysis of the seismic fragility of reinforced concrete frames. The incremental dynamic analysis （IDA） on a five-story reinforced concrete frame structure is carried out using 9 groups of ground motions which take into account the different parameters. Using the IDA, the seismic fragility curves corresponding to different damage states and collapse margin ratios （CMRs） are obtained based on the maximum inter-story drift ratio （θmax）, the average values and dispersion of the maximum residual inter-story drift ratio （RIDRmax） corresponding to the 50% exceeding probability with different damage states and the limit of performance index of RIDRmax corresponding to different seismic performance grades are proposed. The results show that the conditional mean spectrum （CMS） of different spectral shape parameters （ε）, magnitude （M） and earthquake distance （R） significantly influence structure seismic fragility analysis; the ε, M and R have a significant influence on RIDRmax of the structure when the damage is small, but the effect will be no longer obvious when the damage is greater.
  • Earthquake and Wind Resistance
    Seismic Performance Analysis of Highway Hollow Piers with Socket Connections
    MIAO Baodong, WANG Zhigang
    2025, 41(2): 59-65. https://doi.org/10.15935/j.cnki.jggcs.202502.0007
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In recent years, the concept of prefabricated assembly bridges has extended from superstructures to substructures, and it is rapidly advancing towards fully prefabricated bridge construction. As a major form of modular prefabricated components for bridge piers, centrifugally prefabricated reinforced concrete pipe piers have realized industrialized manufacturing. However, there is still a lack of necessary research on their mechanical properties under lateral low frequency cyclic loading. This study employs numerical simulation verified by test data to analyze and compare the seismic performance under lateral low frequency cyclic loading between socketed centrifugally prefabricated pipe piers and cast-in-place solid piers that has been widely applied. The results indicate that socketed prefabricated piers possess equal seismic resistance to that of cast-in-place piers, thus having a broad range of engineering applications in assembly bridge constructions. Finally, the study analyzes the primary factors which influence the seismic performance of centrifugally prefabricated pipe piers and provides recommendations for improving their seismic resistance for future engineering practices.
  • Earthquake and Wind Resistance
    Study on the Horizontal Seismic Sliding Fragility of Wheeled Medical Equipments in Typical Hospital Buildings
    LI Yinghui
    2025, 41(2): 66-73. https://doi.org/10.15935/j.cnki.jggcs.202502.0008
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    A large number of medical equipments in the hospital building are movable with casters, which are prone to large slippage and easy to disconnect from the power plug or collide with other objects under earthquakes, thus adversely affecting the medical function of the hospital. In this paper, based on the calculation formula of the slip response of rigid blocks, a large number of incremental dynamic time history analyses are carried out on wheeled medical devices with different caster states. The horizontal excitation input considers the different floor acceleration responses of typical hospital buildings （seismic isolated, non-isolated） under different site characteristic periodic ground motion sets. The analysis results show that the use of PFV （floor peak velocity） as the floor motion intensity index of wheeled medical equipment can effectively reduce the discreteness of the vulnerability data. The site characteristic period, floor location and dynamic characteristics of the building structure have little influence on the fragility of wheeled medical equipment, while the state of casters has a greater impact, and the wheeled equipment when the casters are locked is less susceptible to damage. Finally, the fragility curve of wheeled medical equipment is proposed, which can be used in the subsequent evaluation of the seismic resilience of hospital buildings.
    • Experiment Study
  • Experiment Study
    Flexural Behavior and Toughness Evaluation of Milled-Cut Steel Fiber Reinforced Concrete
    LIU Shiqi, LIU Yuqing, LI Yongjun, XU Xiaoqing
    2025, 41(2): 74-82. https://doi.org/10.15935/j.cnki.jggcs.202502.0009
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To investigate the influence of milled-cut steel fiber （MSF） on the flexural behavior and toughness of plain concrete, four-point bending tests were conducted on C50 concrete matrixes with different volume fractions of steel fiber （0%,0.6%,1%,1.4%）. The flexural behavior,cracking mode,and failure mechanisms of milled-cut steel fiber reinforced concrete （MSFRC） was analyzed. The evaluation methods for flexural toughness of fiber-reinforced concrete in domestic and international standards were studied to assess their applicability. The results indicate that the maximum equivalent flexural strength of the MSFRC is 1.8 times than that of plain concrete. Upon surpassing the critical fiber volume fraction of 1%, the material displays multiple cracking characteristics,with strain hardening behavior observed at an enhanced fraction of 1.4%. The method specified in JG/T 472—2015 steel fiber reinforced concrete is applicable for characterizing the flexural toughness of milled-cut steel fiber reinforced concrete. The increase in fiber volume fraction enhances the flexural deformation capacity of concrete and improves the post-cracking flexural toughness within the small deflection range.
  • Experiment Study
    Experimental Study on Bond Properties Between Steel Fiber and Cement-Based Materials
    LEI Tiange, CHEN Tao, SHI Huilin, LI Weichao
    2025, 41(2): 83-93. https://doi.org/10.15935/j.cnki.jggcs.202502.0010
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Cement-based materials containing fiber are widely used in engineering structures. In order to study the bonding properties between steel fibers and cement matrix, this research investigated fiber pullout performance of steel fiber in cement mortar and high-strength grout. The bonding properties were evaluated by the indexes of maximum pullout load,energy dissipation and average bond strength. The test results show that the shape of the pullout load displacement curve in the high-strength grout is similar to that of the ordinary cement mortar. The mechanical anchoring effect exists between the deformed fibers and the matrix, and the maximum pullout load and energy dissipation are significantly increased compared with that of the straight fibers. Compared with the straight fiber, the average bond strength and energy disspation of the hooked fiber of ordinary cement mortar matrix are increased by 180.8% and 126.8%, respectively. In high-strength grout, the increase is 363.3% and 474.7% respectively. When the steel fiber has an inclination angle, the process of the pullout is usually accompanied by the spalling of the ordinary cement mortar matrix and the plastic deformation of the steel fiber. The increase of embedding depth will increase the pullout load and energy dissipation, but it may cause the fiber breakage for the waved fiber.
  • Experiment Study
    Experimental Investigations on Sliding Performance between Laminated Rubber Bearing and Girder Bottom
    FENG Keyan, FANG Yuan, CHEN Xu
    2025, 41(2): 94-101. https://doi.org/10.15935/j.cnki.jggcs.202502.0011
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Based on the typical sliding damage between laminated rubber bearings and steel plates embedded at girder bottom occurred in extensive earthquakes, full-scale quasi-static experiments are first conducted to explore the frictional energy dissipation mechanism between bearing and steel plate. The effects of vertical stress and sliding velocity on the behavior of laminated rubber bearings are investigated, including the force-displacement relationship, lateral shear deformation and shear stiffness, and the coefficient of friction. Additionally, shake table tests are further carried out on rubber bearing-mass block system, where both harmonic excitation and recorded seismic ground motion are used as input to investigate the sliding frictional performance between bearings and steel plate. Conclusions from these experiments can serve as foundations supporting seismic design of bridges with laminated rubber bearings.
  • Experiment Study
    Research on Bearing Capacity and Restoring Force Model of Steel Pipe-Aeolian Sand Recycled Concrete Columns
    WANG Yaohong, CHEN KangJie, LU XiaoKai, LI Zhiqiang, DONG Wei
    2025, 41(2): 102-112. https://doi.org/10.15935/j.cnki.jggcs.202502.0012
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To investigate the bearing capacity and restoring force model of steel tube-eolian sand recycled concrete columns, five specimens with varying eolian sand replacement ratios were designed, and pseudo-static tests were conducted. A comparative analysis was performed on the hysteresis curves, backbone curves, and stiffness degradation of each specimen. The experimental results indicated that the specimen with a 30% eolian sand replacement ratio exhibited relatively superior seismic performance. Based on the experimental data, as well as the established backbone curve model and stiffness unloading equation, a restoring force model for the column was developed. This model accurately reflects the hysteresis characteristics of the specimen and is suitable for elastoplastic seismic response analysis of steel tube-eolian sand recycled concrete columns.
  • Experiment Study
    Study of Freeze-Thaw Performance of Roof Structures using Different Types of Mortar
    LI Yutong, HUANG Yong′an
    2025, 41(2): 113-119. https://doi.org/10.15935/j.cnki.jggcs.202502.0013
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    In order to study the freeze-thaw performance of mortar in roofing structure, the freeze-thaw cycles tests were carried out on three roof models of different types of mortar, and the damage evolution rules of three types of mortar were analyzed. The development law of strain of different types of mortar under freeze-thaw environment was studied by using refined finite element model, and the rationality of the test results was verified. The finite element simulation and test results show that the tensile strain of cement mortar is large under the action of freeze-thaw cycles. In the 50th cycle, the strain value has reached 100 με, indicating that cement mortar has cracked, and the strain peak value continues to increase with the increase of freeze-thaw cycles. The peak strain of polymer mortar and polypropylene fiber mortar is small, and the peak strain of the two mortars does not increase with the increase of the number of freeze-thaw cycles within 100 times of freeze-thaw cycles, so the polymer mortar or polypropylene fiber mortar has a better freeze-thaw performance.
  • Experiment Study
    Experimental and Numerical Simulation Study of Heat Transfer in Steel Columns for Localized Fire Conditions
    ZHOU Jinggang, ZHOU Xuanyi, WANG Wei, CONG Beihua
    2025, 41(2): 120-129. https://doi.org/10.15935/j.cnki.jggcs.202502.0014
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The current structural fire resistance research has relatively few studies for localized fire scenarios, and the test results are relatively scarce. Based on this, this paper attempts to build a realistic fire test platform, and adopts two fire source forms, jet fire and pool fire, to heat the H-shaped columns and record its thermal results. In terms of numerical simulation, unlike the iterative coupling method that applies the concept of adiabatic surface temperature, this paper realizes the two-way direct coupling of fluid-solid heat transfer by unifying the fire analysis with the thermal analysis using the CFD method. The distribution rules of the spatial velocity field and temperature field were explored in the fire analysis model, and the thermal characteristics of steel columns in different fire source environments were explored in the thermal model. The correctness of the direct coupling method was verified by comparing experimental data with simulation results. In addition, the theoretical and empirical formulas are applied to explore the distribution law of convective heat transfer coefficient of the steel column surface.
    • Engineering Construction
  • Engineering Construction
    Analysis and Application of Internal Force Changes in Various Stages of Construction and Operation of High-Level Well
    CHEN Ye, QI Min, SHEN Qingsong, GU Shilei, DU Nianfu, CUI Jiaping
    2025, 41(2): 130-136. https://doi.org/10.15935/j.cnki.jggcs.202502.0015
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The internal force distribution of the high-level well is complex and variable in different construction stages, and the construction design can only be carried out after clarifying the internal force distribution. This article is based on the construction of a high-level well Jiaxing City. A numerical software is used to establish a model and study the distribution and variation of internal forces in each stage of the construction. The results show that the axial force on the wellbore changes from a compressed state to a tensile state. The magnitude of the axial force increases linearly with depth in the sinking stage, while in other stages, it shows a pattern of small upward and large downward; The maximum bending moment is relatively small in the sinking stage, significantly increases in the bottom sealing stage, increases in the horizontal bending moment and decreases in the vertical bending moment during the top pipe stage, and increases in both the operating and long-term operating stages; The underground section is basically the same as the operating phase. According to the calculation results of internal forces, the thickness of the wellbore can be optimized to a variable thickness, and the above ground section steel bars can be optimized to be prestressed steel bars to resist the influence of temperature difference. The internal force analysis results and optimization design ideas in this article can provide reference and inspiration for similar projects in the future.
    • Foundation
  • Foundation
    Research on the Design and Deformation Control of PHC Short Pile Foundation for Heliostats
    LIU Ruifeng, CHEN Jing, LI Zijian, ZHANG Zhenchang, XU Chunbo, GUO Zhaosheng
    2025, 41(2): 137-147. https://doi.org/10.15935/j.cnki.jggcs.202502.0016
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To ensure that the PHC short pile foundation of the heliostats meets the accuracy requirements of pile top deformation, this paper relies on a single pile horizontal static load test of a certain project and uses ABAQUS finite element analysis software to conduct nonlinear numerical analysis of the pile-soil integration under pile top static load. By comparing the numerical simulation results with the experimental data, the accuracy of the numerical calculation model is verified, and based on this, the foundation design is carried out. Four measures to improve the anti deformation ability of the short pile structure are proposed, and the enhancement effect is compared and analyzed from three aspects： the bending moment distribution map of the pile body, the displacement distribution map of the pile body below the ground, and the load displacement curve of the pile top. The following conclusions are drawn through analysis： the foundation designed in this article meets the requirements of deformation and crack resistance; Under the soil conditions of this project, when Lu is less than 4.66 m and Ld is greater than 4.34 m, and the bending moment of the pile at the ground meets the crack resistance requirements, the horizontal displacement of the pile top can meet the requirement of less than 25mm; The measures 1, 3, and 4 proposed in this article can enhance the ability of the pile body to resist deformation, while measure 2 has limited effectiveness. In engineering, one or more of these measures can be referred to as needed to improve the stiffness of the pile body and achieve the goal of controlling deformation.
  • Foundation
    Study on the p-y Curve of Lateral-Loaded Pile Considering the Small-Strain Behavior of Clay
    HUANG Yuhua, GU Xiaoqiang, YU Jian
    2025, 41(2): 148-157. https://doi.org/10.15935/j.cnki.jggcs.202502.0017
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The study of the mechanical behavior of a single pile under lateral loads is an important topic in geotechnical engineering. Among various methods, the p-y curve method considers the soil nonlinearity and provides a more accurate reflection of the pile's horizontal bearing behavior compared to the traditional “m” method. Most existing p-y curve models are based on summaries of experimental data, with unclear physical meanings of model parameters and difficulties in determining their values. Therefore, a p-y curve model that reasonably considers the stress-strain characteristics of soil is established based on the pile-soil interaction mechanism. Firstly, based on the Airy stress function, the stress distribution function of the soil around the pile is obtained. Subsequently, the Duncan-Chang model and the small strain model are introduced to describe the small strain nonlinearity of the soil elements around the pile. The p-y curve expression for a laterally loaded pile is ultimately obtained by integrating the strain of the soil. The required parameters of this p-y curve, such as E50 and Su, can be obtained from consolidated undrained triaxial tests or field tests, while small strain parameters G0 and γ0.7 can be obtained from resonant column tests or wave velocity tests. Finally, through comparison with field tests, model tests, and the API code methods, the accuracy and practicality of this p-y curve model are verified.
    • Strengthening and Retrofitting of Structures
  • Strengthening and Retrofitting of Structures
    Reconstruction Technology of Cable-Stayed System of High Pier and Long Span Continuous Rigid Frame Bridge Based on Damage Iteration Model
    HE Peng, GENG Yongkui, ZHOU Bo
    2025, 41(2): 158-167. https://doi.org/10.15935/j.cnki.jggcs.202502.0018
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Based on the reinforcement and reconstruction of a long-span continuous rigid frame bridge with high piers in Yunnan province, a sensitivity analysis method to predict the damage degree of the bridge based on the measured bridge floor alignment is proposed, which provides a theoretical basis for the parametric modification of the finite element model of the bridge. Through iterative calculation of the sensitive parameters that affect the alignment of the bridge floor, the problem of model correction is transformed into an optimization problem of the error minimization between the control target parameter values and the measured data values, according to which the damage degree of the bridge in different periods can be predicted. The design scheme of the cable-stayed system reinforced long-span continuous rigid frame bridge with high piers based on the reconstruction of“No.0 block”is emphatically introduced,which provides reference for the subsequent maintenance and reinforcement of similar bridges.
  • Strengthening and Retrofitting of Structures
    Research on Calculation Method of Bearing Capacity of Existing Masonry Wall after Plugging and Reinforcement
    XU Haonan, JIANG Jitong, DONG Kun, WANG Chunzeng
    2025, 41(2): 168-176. https://doi.org/10.15935/j.cnki.jggcs.202502.0019
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The bearing capacity of the existing wall after plugging reinforcement is studied. Considering the influence of stress lag effect, original stress level, opening rate and plugging material performance on the bearing capacity of the masonry wall after plugging, the corresponding calculation method is given. The results show that the use of the original masonry mortar and block materials can not meet the bearing capacity requirements of the wall ; improving the strength of masonry mortar and block materials can only meet the bearing capacity requirements of some walls ; the use of high ductile concrete to reinforce the wall is an effective means of repair, but there is also the possibility that it cannot meet the demand for bearing capacity.
    • Study of Design Method
  • Study of Design Method
    Analysis and Design of Super-Tall Towers in Seismically Active Regions with Double Excitation Viscous Damping
    ZHOU Feng, WANG Jie, ZHAO Xin, DU Bingjie, MORN Chornay, YAN Xiao, LIN Shengzhong
    2025, 41(2): 177-186. https://doi.org/10.15935/j.cnki.jggcs.202502.0020
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    This paper is based on the engineering background of super-tall towers in earthquake prone areas, comprehensively arranges the position, various deformation amplification devices, viscous damping parameters and other key contents to carry out the selection and analysis of viscous damping systems under wind and earthquake double excitation. Taking a 396 m super-tall tower as an example, the design of viscous damping systems under wind and earthquake double excitation is studied. Research has shown that viscous damping vibration reduction systems have a certain control effect on different modal responses, which can effectively improve the comfort, stiffness, and strength performance of structures under wind and earthquake conditions. Reasonable placement of dampers, deformation amplification devices, and parameter selection can achieve more efficient vibration reduction efficiency.
  • Study of Design Method
    Design Method for Deformation Adaptability of PC Facade Panels
    LU Jiasen, ZHANG Qilin
    2025, 41(2): 187-196. https://doi.org/10.15935/j.cnki.jggcs.202502.0021
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Deformation adaptability is the key issue during design of precast concrete façade panels, which is related to seismic, wind-resistant, waterproof, airtight performance of building façade panels system, and displacement adjustment ability of supporting system between panels and main structures and reasonable sealant joint width is very important for the in-plane adaptability of the panels to the story drift of main structures and the displacement ability of sealant. Firstly, the design formulas of deformation adaptability of bearing joints are suggested, and based on the displacement ability of sealant, the nominal shear deformation rate is put forward. The calculation method of sealant joint width is given by considering the influence factors of thermal movement, seismic movement, wind load movement, construction tolerances and sealant movement capacity, and the movement check computation of sealant joint width is suggested for the story drift of main structure during fortification earthquake and rare earthquake. Finally, an design example is given.
  • Study of Design Method
    Application of Viscous Fluid Damper in School Corridor Space
    WANG Yu
    2025, 41(2): 197-207. https://doi.org/10.15935/j.cnki.jggcs.202502.0022
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In the current research on seismic reduction design of school buildings using viscous fluid dampers, attention is often paid to the main structures such as teaching buildings and dormitory buildings, while neglecting the corridor space that plays an important role in the overall spatial organization of the campus. In order to study the application of viscous fluid damper in school corridor space, this paper takes the corridor space between teaching buildings in a primary school in Shanghai as an example for seismic reduction design. Firstly, conduct frequent earthquake analysis on the structure, and the results meet the requirements of the specifications. Secondly, conduct elastic time history analysis under fortification earthquakes and compare the seismic reduction effects when including the foundation layer or not, the arrangement of dampers in the inner or outer frame, the number of dampers changed, the floor of dampers changed, and determining the seismic reduction plan. Finally, conduct elastic-plastic time history analysis under rare earthquakes to calculate structural damage, energy dissipation, and drift ratio. The research results indicate that viscous fluid dampers can provide certain energy dissipation under earthquake action and are an effective seismic reduction method for school corridor spaces.
  • Study of Design Method
    Research on Design of Core Tube Structures in Super-Tall Buildings Based on Optimization Algorithms
    TANG Zhen
    2025, 41(2): 208-214. https://doi.org/10.15935/j.cnki.jggcs.202502.0023
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    With the development of super-tall building structures, the economy has become the focus of the owners in the design. The core tube is an important component for lateral force resistance and vertical force transmission, which has a great impact on the structural cost. In this study the design of core tube structure in typical super-tall buildings is investigated by using intelligent optimization algorithm. First, a number of engineering cases of super high-rise buildings around 300m high are collected, the common parameters for super-tall structure are summarized, and a typical super-tall building structure model is established accordingly. The advantages and disadvantages of each optimization algorithm are briefly analyzed, and the computational efficiency is compared. Then, the design process of the core tube combined with the intelligent optimization algorithm is proposed, the mathematical model of constraint optimization is established, and the constraint conditions related to the specification and construction are introduced into the optimization process using the penalty function method. Finally, the method is used to optimize the wall thickness of the core tube with different outer frame stiffness and different coupling beam height, and the distribution law of the wall thickness after optimization under different conditions is provided.