为探究实际工程背景下钢-UHPC组合桥面板早期收缩效应的发展与分布规律,考查组合桥面板中UHPC收缩引起的构件次内力水平,在夏季自然环境常温养护条件下进行了90天钢-UHPC组合桥面板静置收缩监测试验。浇筑完成后对UHPC板、钢筋、钢结构等构件的应变值进行了监测与分析,并且利用有限元软件对试验模型开展了收缩模拟与验证,对构件次内力分布、界面滑移等特征做了进一步的探究。研究结果表明：夏季炎热环境下（温度：17 ℃~42 ℃,湿度：50%~90%）,组合桥面板UHPC未见明显裂缝; UHPC初凝时间约为15小时,收缩在约40天时基本稳定;在跨中区域UHPC受约束作用最大,对应的UHPC和钢板次内力最大,钢筋由于与UHPC应变的协同性在该处压应力最小。在远离跨中方向上,UHPC与钢结构的结合作用逐渐减弱。
Abstract
In order to investigate the development and distribution of the early shrinkage effect of the steel-UHPC composite deck slab in a practical engineering context, and to investigate the level of secondary internal forces of the members caused by the shrinkage of UHPC in the composite deck slab, a 90-day static shrinkage monitoring test of the steel-UHPC composite deck slab was carried out in the natural environment under normal temperature maintenance conditions in summer. The strain values of UHPC slab, steel reinforcement, steel structure and other components were monitored and analyzed after the completion of the casting, and the shrinkage simulation and verification of the test model were carried out using finite element software to further investigate the characteristics of the component sub-internal force distribution and interface slippage. The results of the study show that： no significant cracks were observed in the UHPC of the combined deck slab under the hot summer environment （temperature： 17-42 ℃, humidity： 50%-90%）; the initial setting time of UHPC was about 15 hours, and the shrinkage was basically stable at about 40 days; the UHPC was subjected to the greatest restraint in the mid-span region, corresponding to the greatest UHPC and steel plate sub-internal forces, and the compressive stress of the steel reinforcement at this location was the smallest. In the direction away from the span center, the binding effect between UHPC and steel structure gradually decreased.
关键词
桥梁工程 /
钢-UHPC组合桥面板 /
应变监测 /
收缩效应 /
常温养护
{{custom_keyword}} /
Key words
bridge engineering /
steel-UHPC composite bridge deck /
strain monitoring /
shrinkage effect /
normal temperature curing
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] Chen Shiming,Huang Yang,Gu Ping,et al.Experimental study on fatigue performance of UHPC-orthotropic steel composite deck[J].Thin-Walled Structures,2019,142:1.
[2] Zhang Xiuzhen,Liu Zhichao,Wang Fazhou.Autogenous shrinkage behavior of ultra-high performance concrete[J].Construction and Building Materials,2019,226(30):462.
[3] Xie T,Fang C,Ali M M,et al.Characterizations of autogenous and drying shrinkage of ultra-high performance concrete (UHPC):An experimental study[J].Cement and Concrete Composites,2018,91:156.
[4] 李家和,刘铁军,欧进萍.高性能混凝土的自收缩与干燥收缩[C].第五届高强与高性能混凝土及其应用学术讨论会,2003.
Li Jiahe,Liu Tiejun,Ou Jinping.Autogenous shrinkage and drying shrinkage of high performance concrete[C].The Fifth Symposium on High Strength and High Performance Concrete and Its Application,2003.(in Chinese)
[5] 赵筠,廉慧珍,金建昌.钢-混凝土复合的新模式——超高性能混凝土(UHPC/UHPFRC)之一:钢-混凝土复合模式的现状,问题及对策与 UHPC 发展历程[J].混凝土世界,2013(10):56-69.
Zhao Jun,Lian Huizhen,Jin Jianchang.A new mode of steel-concrete composite—UHPC/UHPFRC (UHPC/UHPFRC) Part 1:The status quo,problems and countermeasures of steel-concrete composite mode and the development history of UHPC[J ].Concrete World,2013(10):56-69.(in Chinese)
[6] Huang H,Ye G.Examining the “time-zero” of autogenous shrinkage in high/ultra-high performance cement pastes[J].Cement and Concrete Research,2017,97:107-114.
[7] Fehling E,Schmidt M,Walraven J,et al.Ultra-high performance concrete UHPC:Fundamentals,design,examples[M].John Wiley & Sons,2015.
[8] 崔存森. 养护制度对超高性能混凝土收缩徐变及其基本力学性能的影响[D].北京:北京交通大学,2018.
Cui Cunsen.The effect of curing system on the shrinkage and creep of ultra-high performance concrete and its basic mechanical properties[D].Beijing:Beijing Jiaotong University,2018.(in Chinese)
[9] 胡功球. 不同养护条件下超高性能混凝土(UHPC)的收缩性能研究[D].长沙:湖南大学,2015.
Hu Gongqiu.Research on the shrinkage properties of ultra-high performance concrete (UHPC) under different curing conditions[D].Changsha:Hunan University,2015.(in Chinese)
[10] 中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.活性粉末混凝土:GB/T 31387—2015[S].北京:中国标准出版社,2015.
General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China,National Standardization Administration of China.Activated powder concrete GB/T 31387—2015 [S].Beijing:China Standard Press,2015.(in Chinese)
[11] 中华人民共和国国家质量监督检验检疫总局.金属材料室温拉伸试验方法:GB/T 228—2010[S].北京:中国标准出版社,2010.
General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China.Room temperature tensile test method for metallic materials:GB/T 228—2010[S].Beijing: China Standard Press,2010.(in Chinese)
[12] 管品武,涂雅筝,张普,等.超高性能混凝土单轴拉压本构关系研究[J].复合材料学报,2019,36(5):1295-1305.
Guan Pinwu,Xu Yazheng,Zhang Pu,et al.A review on constitutive relationship of ultra-high-performance concrete under uniaxial compression and tension[J].Acta Materiae Compositae Sinica,2019,36(5):1295-1305.(in Chinese)
[13] Lee J,Fenves G L.Plastic model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998,124(8):892-900.
[14] 张劲,王庆扬,胡守营,等.ABAQUS混凝土损伤塑性模型参数验证[J].建筑结构,2008(8):128.
Zhang Jin,Wang Qinyang,Hu Shouying,et al.Parameters Verification of Concrete Damaged Plastic Model of ABAQUS[J].Building Structure,2008(8):128.(in Chinese)
[15] Huang Hao,Ye Guang.Examining the “Time-Zero” of autogenous shrinkage in high/ultra-high performance cement pastes[J].Cement and Concrete Research,2017,97:110.
[16] Kmiecik P,Kamiński M.Modelling of Reinforced Concrete Structures and Composite Structures with Concrete Strength Degradation taken into Consideration[J].Archives of Civil and Mechanical Engineering,2011,11(3):623-636.
[17] 张渤雨. 后结合钢-UHPC组合桥面板收缩效应及静力性能试验研究[D].上海:同济大学,2020.
Zhang Boyu.Experimental study on shrinkage effect and static performance of steel UHPC composite deck[D].Shanghai:Tongji University,2020.(in Chinese)
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
PDF(1402 KB)
