摘要
传统的抖振分析方法或者过于复杂而不便于工程应用 ,或者忽略了过多的因素而精度不高。根据R .H .Scanlan的桥梁颤抖振分析方法并引入气动导纳的影响 ,采用数值积分的结果 ,得到了大跨度桥梁抖振反应谱的实用公式 ,并提出了一种计入背景响应的实用方法。还研究了背景响应的变化规律 ,并进行了工程实例分析。分析结果表明 :背景响应在很多情况下不可忽略 ,现给出的实用公式具有较高的精度 。
A practical formula of the buffeting response spectrum for a long span bridge is proposed in the paper.It is based on the Scanlan's buffeting theory with a modification of the aerodynamic admittance function.At the same time,the background response is considered.We found that the background response must be considered for some more flexible bridge with a mid span.The Yangtze river bridge at Yichang and the Minjiang river bridge at Fuzhou are taken as examples to be analyzed.The numerical results are compared with that of other methods.The comparison shows that the proposed formula is easy to use with enough accuracy.
出处
《土木工程学报》
EI
CSCD
北大核心
2002年第1期28-34,共7页
China Civil Engineering Journal
基金
国家自然科学基金重大项目资助,编号:59895410
关键词
大跨桥梁
抖振反应谱
背景响应
实有公式
long-span bridges
buffeting responses spectrum
background responses
practical formulae
