行波激励下大跨度拱桥随机地震响应分析  

Random seismic response of long-span arch bridge under effect of traveling wave

作　　者：刘爱荣[1] 唐潘[1] 禹奇才[1] 张俊平[1] 

机构地区：[1]广州大学土木工程学院,广东广州510006

出　　处：《广州大学学报（自然科学版）》2011年第3期51-55,共5页Journal of Guangzhou University:Natural Science Edition

基　　金：国家自然科学基金项目(50978062);广东省自然科学基金项目(9151065004000002);广东省科技计划项目(2010A030200014);广州市科技计划项目(2010Y1-C751)资助

摘　　要：基于随机振动理论,研究了大跨度拱桥在行波激励作用下的平稳随机地震响应特性,揭示了地震视波速及场地条件对大跨度拱桥的地震响应影响规律.研究结果表明:行波效应和地震场地条件对大跨度拱桥地震响应影响很大,随着地震视波速减小主拱圈内力表现为递增趋势,当视波速为50 m.s-1时拱脚弯矩较一致激励增大了84%;随着场地刚度减小主拱圈内力逐渐增大,在一致激励作用下,软场地及中等场地条件下,拱脚弯矩分别比硬场地条件下增大了94%和22%.Based on the theory of random vibration, the stationary random seismic response characteristics for long-span arch bridge excited by traveling wave was investigated in this paper, from which the influence trends of the seismic shearwave velocity and field conditions on long-span arch bridge were revealed. It is showed that the effect of traveling wave and filed conditions of seismic site have a great contribution to the seismic response of long-span arch bridge. With the seismic shearwave velocity decreasing, the internal forces of the main arch show an increasing trend. Compared with the synchronous seismic excitation, the bending moment of arch springing increases by 84% under the shearwave velocity of 50 m · g-1, and with the stiffness of field increasing, the inter- nal forces of the main arch become smaller. Under the synchronous seismic excitation, the bending moment of arch springing in soft soil and medium soil increases by 94% and 22% respectively more than that in firm soil field.

关 键 词：大跨度拱桥 地震响应 随机振动 行波效应 场地条件 

分 类 号：TU311[建筑科学—结构工程]