悬索桥简化抖振反应谱研究  

Research on simplified buffeting response spectrum of suspension bridge

作　　者：白桦[1] 何俊 李宇[1] 李加武[1] 

机构地区：[1]长安大学公路学院,公路大型结构安全教育部工程中心,陕西西安710064 [2]四川川北公路规划勘察设计有限责任公司,四川广元628017

出　　处：《广西大学学报（自然科学版）》2013年第1期111-118,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51078038);桥梁结构抗风技术交通行业重点实验室开放基金资助(KLWRTBMC10-01);中国博士后科学基金资助项目(2011M501429);中央高校基本科研业务费专项资金资助(CHD2011JC003,CHD2011JC004)

摘　　要：为了解决传统抖振分析方法较复杂的问题,采用简化振型函数的方法,总结了一种考虑背景响应的简化悬索桥抖振反应谱计算方法。通过实例计算验证,表明采用这种型函数方法是高效、准确的。采用这种方法分析了结构阻尼比、气动导纳函数、气动自激力及主梁跨径等参数对悬索桥抖振响应的影响。结果表明:对混凝土等阻尼比较大的桥梁,背景响应的影响不可忽略;气动导纳取Sears函数时,抖振响应分析结果可能会偏危险;不考虑自激力影响,抖振响应将偏大10%～150%左右,背景响应比例会偏小10%～130%左右;跨径超过2 000 m的超大跨径桥梁,背景响应的作用可以忽略。In order to solve the problem that traditional analytical method for buffeting is relatively complicated, the modal function was simplified and a simplified calculation method for buffeting re- sponse spectrum of suspension bridge with consideration of backgroud response was summarized. It is proved that this function is more efficient and with higher accuracy when applied to the actual ex- amples. The influence of different parameters such as damping ratio, aerodynamic admittance func- tion, self-exited force and bridge span on the buffeting response of suspension bridge is analyzed. The results show that the background responses, which bring bridges large damping, can not be ig- nored. The results of buffeting response appear dangerous when the aerodynamic admittance adopts the Sears function. Buffeting response would be 10% - 150% larger and background response would be 10% - 130% smaller when the self-excited force is neglected. The effect of background response can be ignored when the span of bridge is more than 2 000 meters.

关 键 词：桥梁工程 悬索桥 抖振 反应谱 背景响应 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] TU317.1[交通运输工程—道路与铁道工程]