摘要
以某大跨度双塔空间缆索面自锚式悬索桥为背景,系统阐述了典型减隔震装置对不同设防烈度下桥梁减隔震设计的适用性;同时基于有限元数值模拟方法,构建7种约束体系的有限元模型,进行模态分析和地震反应谱分析,以揭示不同约束体系对结构动力特性和地震响应的影响。研究结果表明:对于双塔空间缆索面自锚式悬索桥,采用纵桥向塔梁之间弹性约束、墩梁之间完全释放约束,横桥向塔梁之间完全约束、墩梁之间弹性约束是合理的抗震约束体系;塔、梁是否设置竖向支撑,对桥梁地震响应影响不大。所提出的“纵-横-竖”合理抗震约束体系可为同类桥梁抗震设计提供一定的借鉴作用。
Taking a long-span double-pylon spatial cable plane self-anchored suspension bridge as the background,the applicability of typical seismic isolation and energy dissipation devices to bridge seismic isolation and energy dissipation under different seismic fortification intensities is systematically expounded.At the same time,based on the finite element numerical simulation method,7 finite element models with distinct constraint systems are constructed to carry out the modal analysis and seismic response spectrum analysis in order to reveal the influence of various constraint systems on the structural dynamic characteristics and seismic responses.The research results show that for a doublepylon spatial cable plane self-anchored suspension bridge,it is a reasonable seismic restraint system to adopt elastic constraints between pylon and girder,and fully release constraints between piers and girder in the longitudinal direction of the bridge,and complete constraints between pylon and girder,and have elastic constraints between piers and girder in the transverse direction of the bridge.Whether vertical supports are set up for pylons and girder has little impact on the seismic response of bridges.The proposed“longitudinal-transverse-vertical”rational seismic constraint system can provide some references for seismic design of similar bridges.
作者
曲慧
QU Hui(Tongji University Architectural Design and Research Institute(Group)Co.,Ltd.,Shanghai 200092,China)
出处
《城市道桥与防洪》
2025年第9期203-207,共5页
Urban Roads Bridges & Flood Control
关键词
自锚式悬索桥
双塔空间缆索面
抗震体系
self-anchored suspension bridge
double-pylon spatial cable plane
seismic resistant system
