基于性能的大跨桥梁颤抖振响应概率性评价  

Probabilistic evaluation of flutter-buffeting response of long-span bridges based on performance

作　　者：邵亚会[1] 海瑞 钟剑[1] 赵彤 SHAO Yahui;HAI Rui;ZHONG Jian;ZHAO Tong(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2021年第1期67-72,106,共7页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51308178;51608161)。

摘　　要：大跨度桥梁颤抖振响应因风场的随机性呈现较大差异,建立基于性能的大跨度桥梁概率性评价方法尤为重要。文章建立了基于性能的大跨度桥梁颤抖振性能概率性评价方法;首先对同风速时的风场进行10~20组多组随机生成,分别计算不同风速、不同随机风场下桥梁的随机振动响应;然后对同风速下多组响应计算结果进行最不利响应曲线拟合,确定结构响应的概率分布;最后基于结构最不利响应,确定不同损伤程度的界限,建立大跨桥梁损伤的评价标准,对桥梁随机振动全过程损伤程度进行评价,建立不同损伤级别下的损伤曲线。研究结果表明:跨中最不利响应的均值在横向与竖向随风速呈幂指数增长;Q-Q图显示同一平均风速下,跨中横向和竖向随机振动的最不利响应符合正态分布且与风速大小无关;基于行人和行车舒适度的评价标准,结构竖向损伤比横向均对风速更加敏感,结构的损伤主要由竖向损伤控制。The flutter-buffeting response of long-span bridge has great difference for the reason of randomness of wind fields.Establishing the framework of probabilistic evaluation method for long-span bridges based on performance is particularly important.In this paper,1020 groups of random groups were generated in the wind field at each wind speed,and the responses of bridges under different wind speeds were calculated.Thereafter,the most adverse response curve fitting was carried out for the multi-group response results under the same wind speed,confirming the probability distribution of the response.Finally,based on the most adverse response of the structure,the limits of different damage degrees were determined,the damage evaluation criteria of the long-span bridge were discussed,and the damage curves under different damage levels were established.It is found that the mean value of the most adverse responses in the midspan of a long-span suspension bridge increases exponentially with wind speed in both the horizontal and vertical directions.The Q-Q figure shows under the same average wind speed,the most adverse responses of the transverse and vertical random vibrations in the midspan are positively distributed and independent of the wind speed.According to the evaluation criteria of pedestrian and driving comfort,the vertical response of the structure is more sensitive to the wind speed than the horizontal response and the damage of structure is mainly controlled by vertical damage.

关 键 词：颤抖振 损伤评价 概率分布 舒适度 损伤曲线 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]