摘要
以润扬长江大桥悬索桥为工程背景,提出了一种随机车辆荷载作用下大跨悬索桥振动响应计算方法。在准确的悬索桥有限元模型基础上,根据实测车辆统计数据采用指数分布模拟随机车流,进而分析悬索桥动力响应。分析结果表明:结构各关键部位按动力学方法计算的响应更能反映实际情况;悬索桥1/8点与7/8点处位移响应最为剧烈,在桥梁运行状况的监测中,应重点关注这两个关键区域;车辆超载对桥梁结构的动力响应有显著影响,在日常运营管理中应严格控制超载车辆的通行。
Dynamic analysis of the Runyang Suspension Bridge under random moving vehicular loads is presented. According to the observed data from daily traffic on the bridge, an exponential model is adopted to simulate the random moving vehicular loads. Based on the finite element model of the bridge, the dynamic responses can be obtained by solving the equation of motion of the formulated model. Results show that responses from the dynamic and static analysis differ significantly from each other. The dy- namic amplifications of the response reach a high level at the 1/8 and 7/8 spans compared with the results from the static ana/y- sis, which indicates that these two locations should be paid more attention during the health monitoring of the bridge. Responses of the bridge will be apparently affected by the over-weighted vehicles but are not sensitive to the moving velocity; therefore, o- ver-weighted vehicles should be controlled during the daily management of the bridge.
出处
《中国科技论文》
CAS
北大核心
2013年第11期1131-1135,共5页
China Sciencepaper
基金
国家自然科学基金资助项目(10902024)
教育部新世纪优秀人才支持计划资助项目(NCET-11-0086)
江苏省自然科学基金资助项目(BK2010397)
关键词
随机交通荷载
大跨悬索桥
有限元
振动响应
stochastic traffic loads
large-span suspension bridge
finite element method
dynamic response
