桥面板施工顺序对钢-混组合梁桥的受力影响研究及优化  

Influence of Deck Panel Construction Sequence on Load BearingPerformance of Steel-Concrete Composite GirderBridge and Optimization

作　　者：姜博 彭友松 权新蕊 王刚 JIANG Bo;PENG Yousong;QUAN Xinrui;WANG Gang(Sichuan Communications Surveying&Design Institute Co.,Ltd.,Chengdu 610017,China;School of Automation,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]四川省交通勘察设计研究院有限公司,四川成都610017 [2]成都信息工程大学自动化学院,四川成都610225

出　　处：《桥梁建设》2024年第3期149-156,共8页Bridge Construction

基　　金：四川省自然科学基金项目(2022NSFSC0441)~~。

摘　　要：为分析桥面板施工顺序对钢-混组合梁桥成桥受力性能的影响并优化现有的桥面板施工顺序,基于钢-混组合梁桥的受力过程,以交通部颁发的装配化钢-混组合梁通用图为依托,选取3×40 m钢-混组合连续梁桥为对象进行研究。采用桥梁博士软件建立钢-混组合梁桥有限元模型,以桥面板施工工序和结构体系转换时间为变量,分析7种桥面板施工顺序下的结构受力性能。结果表明:钢-混组合截面的受力模式分为一次受力状态和分阶段受力状态,其中采用一次受力状态的施工顺序具有施工方便、成桥整体刚度大、钢梁应力小的优点,但存在支点处桥面板拉应力过大的缺点;分阶段受力状态的施工顺序能有效降低支点处桥面板拉应力,但成桥钢梁应力偏大,结构刚度不足。针对采用上述2种受力模式的施工顺序不能兼顾结构成桥性能(钢梁应力、整体刚度等)较优与控制支点桥面板拉应力的问题,提出优化的混合受力状态的施工顺序,该顺序既保留了一次受力状态较优的成桥性能又显著降低了支点处桥面板拉应力,兼顾了上述2种受力模式的优点,可为钢-混组合梁桥的设计和施工提供参考。In this paper,the General Drawing of Prefabricated I-Type Composite Beam Bridge issued by the Ministry of Transport of the People′s Republic of China is consulted to analyze the influence of deck panel construction sequence on the load bearing behaviors of the steel-concrete composite girder bridge after completion and optimize the commonly-used deck panel construction sequence.A finite element model of a steel-concrete composite girder bridge with three continuous spans of 40 m was developed in Dr.Bridge,with the deck panel construction timeline and structural system transformation timing as variables,to analyze the load bearing behaviors of the bridge structure when seven different construction sequences of deck panels were applied.It is shown there exists two stress states,namely the one-off stress state(dead loads are applied to the composite girder at a time)and staged stress state(including the stage where the steel girders independently carry the dead loads and the stage the dead loads are carried by the composite cross-section).To combine the steel girders and deck panels first in a span together and then erect the whole composite structure can lead to eased construction sequence,greater overall stiffness of the structure and smaller stresses in the steel girders during construction,but oversized tensile stresses in the deck panels at supports,while to erect the steel girders in a span first and then construct the deck panels and combine the two can effectively reduce the tensile stresses in the deck panels at supports,but induce oversized stresses in the steel girders and insufficient structural stiffness after completion of the bridge.Neither of the two deck panel construction sequences could allow the bridge to have sound performance after completion while bringing the tensile stresses in the deck panels at supports under proper control.The mixed construction sequence draws the advantages of both the two states,which enables the bridge to have sound performance after completion and notably reduce the

关 键 词：钢-混组合梁桥 桥面板 结构体系转换 施工顺序 受力性能 有限元法 

分 类 号：U448.38[建筑科学—桥梁与隧道工程] U443.31[交通运输工程—道路与铁道工程] U445.4