Π形组合梁斜拉桥施工过程主梁应力分析方法
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摘要
为准确计算Π形组合梁斜拉桥施工过程中的主梁应力,基于能量变分原理建立了考虑轴力、弯矩、剪力滞相互耦合的有限梁段实用单元,提出了适用不同支承、不同边界条件下的有限梁段法主梁应力计算公式,对某主跨360m的Π形组合梁斜拉桥进行了实桥试验验证,并分析了该桥关键施工阶段的应力变化规律。结果表明:采用有限梁段法计算的主梁应力精度较高,钢主梁和混凝土桥面板的应力差异均在±3MPa内,与实桥试验的相对应力误差不超过5%;有限梁段法可以从整体上分析Π形组合梁斜拉桥施工全过程的主梁应力变化规律;关键施工阶段中钢主梁主要受拉,混凝土桥面板主要受压,且整个施工过程中混凝土板应力变化不大。
In order to accurately calculate the stress of main girder during construction,we established a practical finite segmental girder element based on the energy variational principle after taking the mutual coupling of axial force,bending moment,and shear lag into account.Moreover,we put forward the stress calculation formulas of composite girder under the conditions of different boundary support and different load,verified the calculation formulas by real bridge tests on a 360 m Π-shaped composite girder cable-stayed bridge,and analyzed the stress variation law of the bridge during the key construction stage.The results show that the finite segmental girder method can be adopted to accurately calculate the stress of main girders,the difference in stress of the steel main girder and the concrete bridge deck is within ±3 MPa,and the relative difference between the calculation results and the actual bridge test does not exceed 5%.The finite segmental girder method can be adopted to analyze the stress variation law of the main girder during the whole construction process of Π-shaped composite girder cable-stayed bridge.In the key construction stage,the steel main girder is mainly in a tensile state,the concrete bridge deck is mainly in a compressive state,and the stress of the concrete deck negligibly changes during the whole construction process.
In order to accurately calculate the stress of main girder during construction,we established a practical finite segmental girder element based on the energy variational principle after taking the mutual coupling of axial force,bending moment,and shear lag into account.Moreover,we put forward the stress calculation formulas of composite girder under the conditions of different boundary support and different load,verified the calculation formulas by real bridge tests on a 360 m Π-shaped composite girder cable-stayed bridge,and analyzed the stress variation law of the bridge during the key construction stage.The results show that the finite segmental girder method can be adopted to accurately calculate the stress of main girders,the difference in stress of the steel main girder and the concrete bridge deck is within ±3 MPa,and the relative difference between the calculation results and the actual bridge test does not exceed 5%.The finite segmental girder method can be adopted to analyze the stress variation law of the main girder during the whole construction process of Π-shaped composite girder cable-stayed bridge.In the key construction stage,the steel main girder is mainly in a tensile state,the concrete bridge deck is mainly in a compressive state,and the stress of the concrete deck negligibly changes during the whole construction process.
引文
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[11]JTG/T D64-01-2015,公路钢混组合桥梁设计与施工规范[S].(JTG/T D64-01-2015,Specifications for Design and Construction of Highway Steel-Concrete Composite Bridge[S].)
[2]蔺鹏臻,方炜彬,杨子江,等.预应力作用下箱梁桥的剪力滞效应研究[J].中国公路学报,2015,28(5):101-107.(LIN Peng-zhen,FANG Wei-bin,YANG Zi-jiang,et al.Shear Lag Effect Analysis of Box Girder Bridge Under Prestressing Effect[J].China Journal of Highway and Transport,2015,28(5):101-107.in Chinese)
[3]朱力,聂建国,季文玉.钢-混凝土组合箱型梁的滑移和剪力滞效应[J].工程力学,2016,33(9):49-58,68.(ZHU Li,NIE Jian-guo,JI Wen-yu.Slip and ShearLag Effects of Steel-Concrete Composite Box Beam[J].Engineering Mechanics,2016,33(9):49-58,68.in Chinese)
[4]王建国,陈涛.船舶与大跨度斜拉桥碰撞的有限元数值模拟[J].桥梁建设,2016,46(5):12-17.(WANG Jian-guo,CHEN Tao.Finite Element Numerical Simulation of Colliding of Vessel with Long Span Cable-Stayed Bridge[J].Bridge construction,2016,46(5):12-17.in Chinese)
[5]卢海林,张山,万崇勇,等.静动荷载作用下简支预应力混凝土曲线箱梁剪力滞效应分析[J].武汉工程大学学报,2016,38(5):465-470.(LU Hai-lin,ZHANG Shan,WAN Chong-yong,et al.Shear Lag Effect of Curved Box Girder of SimplySupported Prestressed Concrete under Static and Dynamic Load[J].Journal of Wuhan Institute of Technology,2016,38(5):465-470.in Chinese)
[6]卫军,黄敦文,晏辉煌,等.短悬臂斜拉桥主梁正应力分布试验研究[J].土木工程学报,2017,50(1):70-74,81.(WEI Jun,HUANG Dun-wen,YAN Hui-huang,et al.Experimental Study on Normal Stress Distribution of Main Girder in Short Cantilever Cable-Stayed Bridge[J].China Civil Engineering Journal,2017,50(1):70-74,81.in Chinese)
[7]刘洋,周世军,王刚.河口大桥施工过程剪力滞效应研究[J].桥梁建设,2017,47(4):36-41.(LIU Yang,ZHOU Shi-jun,WANG Gang.Study of Shear Lag Effects of Hekou Bridge in Construction Process[J].Bridge Construction,2017,47(4):36-41.in Chinese)
[8]张二华,单德山,周泳涛.曲线斜拉桥主梁扭矩分布优化及试验验证[J].桥梁建设,2018,48(1):71-75.(ZHANG Er-hua,SHAN De-shan,ZHOU Yong-tao.Optimization and Test Verification of Torque Distribution of Main Girders of Curved Cable-Stayed Bridges[J].Bridge Construction,2018,48(1):71-75.in Chinese)
[9]周世军,宋刚.剪力滞对斜拉桥中Π形主梁弯曲刚度影响分析[J].土木工程学报,2018,51(1):106-113.(ZHOU Shi-jun,SONG Gang.Effect of Shear Lag on Flexural Stiffness ofΠ-Shaped Girder in Cable-Stayed Bridges[J].China Civil Engineering Journal,2018,51(1):106-113.in Chinese)
[10]宋刚.结合梁斜拉桥中剪滞效应的数值解法(硕士学位论文)[D].重庆:重庆大学,2017.(SONG Gang.Numerical Solution of Shear-Lag Effect in Composite Girder Cable-Stayed Bridge(Master Dissertation)[D].Chongqing:Chongqing University,2017.in Chinese)
[11]JTG/T D64-01-2015,公路钢混组合桥梁设计与施工规范[S].(JTG/T D64-01-2015,Specifications for Design and Construction of Highway Steel-Concrete Composite Bridge[S].)