非线性温度场耦合效应对连续梁-拱组合桥力学性能的影响  

Effects of the Coupled Nonlinear Temperature Field on Mechanical Properties of Continuous Beam and Arch Composite Bridge

作　　者：钱有伟 伍平 林柯 魏志伟 王炎[2] Qian Youwei;Wu Ping;Lin Ke;Wei Zhiwei;Wang Yan(The Second Engineering Co.,Ltd.of Ctce Group,Suzhou 215100,Jiangsu,China;School of Architecture and Engineering,Zhejiang University of Technology,Hangzhou 310018,China)

机构地区：[1]中国中铁四局集团第二工程有限公司,江苏苏州215100 [2]浙江理工大学建筑工程学院,杭州310018

出　　处：《科技通报》2025年第3期99-105,113,共8页Bulletin of Science and Technology

基　　金：国家自然科学基金项目(42377136)。

摘　　要：连续梁-拱组合桥有着结构受力合理、材料利用率高、对地基适应能力强及造价较低等多重优点,在高速铁路交通建设中运用越来越广泛。对连续梁-拱组合桥而言,吊杆是连接拱肋及连续梁的关键构件。非线性温度场耦合效应通常会对吊杆内力造成影响,进而影响全桥的受力安全。本文通过Midas/Civil建立全桥有限元模型,对不同升降温工况下吊杆内力、连续梁及拱肋的力学性能进行分析,同时结合ANSYS建立拱脚细部模型,对拱脚的受力状态进行分析。分析结果表明:非线性耦合温度场对吊杆内力大小影响显著,对短吊杆而言更为敏感;连续梁线形受非线性耦合温度场影响较大;拱脚整体应力分布规律不会随着非线性耦合温度场而改变,但升温会造成拱脚拉应力增大,影响拱脚结构安全。设计与施工过程中,应充分考虑非线性耦合温度场作用以及其对吊杆索力、桥梁线形、拱脚应力的影响。The continuous beam-arch composite bridge,characterized by rational structural loading,high material utilization,strong adaptability to foundations,and relatively low cost,is increasingly applied in high-speed railway transportation construction.For continuous beam-arch composite bridges,suspenders are key components connecting the arch ribs and the continuous beam.The coupled nonlinear temperature field often affects the internal forces of the suspenders,further impacting the overall structural safety of the bridge.In this paper,a finite element model of the entire bridge is established using Midas/Civil to analyze the mechanical properties of the suspenders,continuous beam,and arch ribs under different temperature rise and fall conditions,additionally,a multi-scale model of the arch feet is established using ANSYS to analyze the stress state of the arch feet.The analysis results indicate that the coupled nonlinear temperature field significantly affects the internal forces of the suspenders,with shorter suspenders being more sensitive;The alignment of the continuous beam is greatly influenced by the coupled nonlinear temperature field;Although the overall stress distribution pattern of the arch feet does not change with the coupled nonlinear temperature field,temperature rises can increase tensile stresses in the arch feet,compromising their structural safety.During design and construction,the effects of the coupled nonlinear temperature field on suspender cable forces,bridge alignment,and arch foot stresses should be fully considered.

关 键 词：非线性耦合温度场 吊杆 有限元 梁拱组合 拱脚应力 

分 类 号：U447[建筑科学—桥梁与隧道工程]