斜风作用下大跨度斜拉桥裸塔抖振性能  

Buffeting Performance of Free-Standing Tower of Long-Span Cable-Stayed Bridge under Yawed Wind

作　　者：朱乐东[1] 曹映泓 丁泉顺[1] 徐建英[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]广东省路桥建设发展有限公司,广东广州510635

出　　处：《同济大学学报（自然科学版）》2005年第7期880-884,共5页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金资助项目(50378068)

摘　　要：通过气弹全模型试验对斜风作用下湛江海湾大桥裸塔抖振响应性能进行了研究.结果显示:随着风偏角的增加,该桥裸塔抖振响应呈非单调变化,顺桥向和横桥向抖振位移响应在30°风偏角附近达到最小值,在0°或90°附近达到最大值;从总体上看,桥塔抖振位移响应随风速的增加近似地按两次曲线增加;对于桥塔顺桥向、横桥向和扭转抖振响应,峰值因子有所不同,试验平均值分别为2.72,3.38和3.62.The buffeting performance of the free-standing tower of Zhanjiang Bay Bridge, a long-span cable- stayed bridge,under yaw wind is investigated by means of wind tunnel test of aeroelastic full model.It is found that the variation of buffeting response of the free-standing tower with wind yaw angle is not monotonous.The longitudinal and lateral buffeting responses of the free-standing tower attain their minimal values at around 30° of wind yaw angle and reach their maximal values at about 0°or 90°of wind yaw angle.It is also seen that,in general,the buffeting responses increase with the increase of wind speed at a conic curve approximately.The measured peak factors are different to some extent for the longitudinal,lateral and torsional buffeting responses of the free-standing tower,and the averaged values are 2.72,3.38 and 3.62,respectively.

关 键 词：大跨度斜拉桥 裸塔 斜风 抖振 峰值因子 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]