大跨钢桁架吊杆拱桥地震响应分析  

Study on Seismic Response of Long-span Steel Truss Arch Bridge

作　　者：张先蓉[1] 袁毅[1] ZHANG Xianrong;YUAN Yi(China Railway Major Bridge Reconnaissan and Design Institute Co Ltd,Wuhan 430056,China)

机构地区：[1]中铁大桥勘测设计院集团有限公司,湖北武汉430056

出　　处：《土木工程与管理学报》2023年第2期77-84,共8页Journal of Civil Engineering and Management

摘　　要：为研究强震作用下大跨钢桁架吊杆拱桥各结构地震响应,以实际桥梁工程为背景,建立三维精细化土-桥梁有限元模型,采用土体非线性本构并考虑土-桥梁结构相互作用,分析了桥墩、承台及桩基础的整体刚度损伤、桥身应力分布以及桥主梁纵向位移,通过不同试验工况进行对比。结果表明:强震作用下,桥梁下部混凝土损伤集中在桥墩与承台连接处、承台与桩基础接触处,且混凝土等级对损伤影响较大;桥身应力集中位置主要分布于两侧桥墩附近,水平地震动方向的改变影响桥身的应力分布,桥身整体应力并未发生明显变化,但竖向地震动对桥身地震响应影响显著,且横向与竖向地震动作用下桥身整体地震响应最大;桥主梁纵向位移最值出现在桥梁两端及主拱中间位置附近,双向地震动对整体桥主梁位移影响更大。研究结论可为大跨钢桁架吊杆拱桥的抗震分析与设计提供科学的参考依据。To study the seismic response of large-span steel truss suspension arch bridge with various structural components under strong earthquake action,based on actual bridge engineering,a three-dimensional refined soil-bridge finite element model was established.Nonlinear soil constitutive relationship and soil-bridge structural interaction were considered,and the overall stiffness damage of bridge pier,bearing,and pile foundation,stress distribution of bridge deck,and longitudinal displacement of bridge main beams were analyzed under comparing different experimental conditions.The results show that under strong earthquake action,concrete damage of the bridge substructure is concentrated in the connections between the bridge pier and bearing,and between the bearing and pile foundation,and the concrete grade has a significant influence on the damage.The stress concentration in the bridge deck is mainly distributed near the two bridge piers,and the change in the horizontal seismic direction affects the stress distribution of the bridge deck.The overall stress of the bridge deck does not change obviously,but the vertical seismic action significantly affects the seismic response of the bridge deck.The overall seismic response of the bridge deck is the largest under both horizontal and vertical seismic actions.The maximum longitudinal displacement of the bridge main beam appears near the ends of the bridge and the middle position of the main arch,and the bidirectional seismic action has a greater influence on the overall displacement of the bridge main beam.The conclusion can provide a scientific reference for the seismic analysis and design of large-span steel truss suspension arch bridges.

关 键 词：土-结构相互作用 非线性 时程分析 钢桁架拱桥 

分 类 号：U448.224[建筑科学—桥梁与隧道工程] U448.225[交通运输工程—道路与铁道工程]