摘要
为探索大跨度悬索桥的合理抗震结构体系,以主跨1 490m的润扬长江公路大桥为背景,采用多振型地震反应谱分析方法,分析了桥跨布置、主缆矢跨比、边主跨比、加劲梁高度、中央扣设置以及加劲梁支承方式等主要结构设计参数对大跨度悬索桥地震反应的影响。研究结果表明:三跨悬吊连续布置是大跨度悬索桥理想的抗震结构布置形式;采用大的主缆矢跨比可以明显改善结构抗震性能,主缆矢跨比以1/10较合理;短边跨布置可以显著增强悬索桥的抗震性能;增大加劲梁高度不利于悬索桥的抗震性能;跨中位置缆梁间设置刚性中央扣有利于增加结构刚度及其抗震性能;加劲梁采用三跨连续支承方式时结构抗震性能最优。
To examine the rational anti-seismic structural system for the long-span suspension bridge,the Runyang Changjiang River Highway Bridge with a main span of 1 490 m was taken as the study background.By using the multi-mode seismic response spectrum analysis,the effects of the main structural design parameters on the seismic response of the long-span suspension bridge were analyzed,including the span arrangement,sag ratio of the main cables,side span to main span ratio,depth of the stiffening girder,lay-out of the central buckle and the supporting way of the stiffening girder.The results of the study indicate that the type of three-span continuous suspension is the ideal anti-seismic structural arrangement for the long-span suspension bridge.A big sag ratio for the main cables can significantly improve the seismic performance of the structure.A sag ratio of 1/10 is rational.Decreasing the side-span length can obviously enhance the seismic performance of the suspension bridge.The increase of the depth of the stiffening girder is not favorable to the improvement of the seismic performance of the suspension bridge.To place the central buckle between the cable and the girder in the midspan is of advantage to increase the structural stiffness and the seismic performance.The structure gains the optimum seismic performance when the stiffening girder adopts the way of three-span continuous supporting mode.
作者
张新军
张超
ZHANG Xin-jun ZHANG Chao(College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China)
出处
《世界桥梁》
北大核心
2017年第1期39-44,共6页
World Bridges
基金
浙江省自然科学基金项目(LY15E080020)
关键词
悬索桥
大跨度
多振型地震反应谱分析方法
抗震性能
结构体系
桥跨布置
矢跨比
加劲梁
中央扣
suspension bridge
long-span
multi-mode seismic response spectrum analysis method
seismic performance
structural system
span arrangement
sag ratio
stiffening girder
central buckle
