摘要
在高地震烈度区,中等跨度斜拉桥选择合理的抗震约束体系,对优化结构抗震性能具有较好的效果。以跨径布置(100+240+100)m的斜拉桥为工程案例,对四种不同的横桥向约束体系进行模态分析、非线性时程分析,并比较了过渡墩的三种约束方案对桥梁整体抗震性能的影响,结果表明在横桥向设置弹塑性约束装置可大幅降低结构地震响应;此外,对弹塑性约束的力学参数Fy、K1和K2进行了敏感性分析,得到了结构地震响应的变化趋势,并给出了参数设计的建议。基于理论分析结论,在不同地震水准下,对弹塑性约束装置的工程应用提出了三道抗震设防防线的设计思路,为中等跨度斜拉桥抗震体系的选择提供参考。
In strong earthquake area, choosing a reasonable aseismic constraint system has a better effect on optimizing aseismic performance of medium-span cable-stayed bridges. Here, a cable-stayed bridge with a span of 100 m+240 m+100 m was taken as an engineering case. Firstly, modal analysis and nonlinear time-history analysis were performed for four different transverse constraint systems. Then effects of 3 constraint schemes of transition pier on bridge overall aseismic performance were compared. Results showed that setting an elastoplastic constraint device in bridge transverse direction can significantly reduce the structural seismic response;sensitivity analyses are conducted for mechanical parameters Fy, K1 and K2 of the elastoplastic constraint to obtain the variation trend of structural seismic response, and give suggestions for parametric design;based on conclusions of theoretical analysis, under different seismic levels, the design idea of 3 aseismic defense lines is proposed for engineering application of elastoplastic constraint devices, the proposal provides a reference for choosing aseismic system of medium-span cable-stayed bridge.
作者
黄永福
马健
夏支贤
HUANG Yongfu;MA Jian;XIA Zhixian(Yunnan Transportation Planning and Design Institute Co Ltd,Kunming 650041,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2020年第15期237-242,共6页
Journal of Vibration and Shock
关键词
中等跨度斜拉桥
弹塑性约束
非线性时程分析
参数敏感性
抗震防线
medium-span cable-stayed bridge
elastoplastic constraint
nonlinear time history analysis
parametric sensitivity
aseismic defense line
