风雨耦合环境结构荷载与响应的分析及试验研究  

Theoretic and testing investigation of wind-rain coupling loads on bridges and structures

作　　者：赵林[1] 葛耀君[1] 武占科[1] 许林汕[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

出　　处：《振动工程学报》2014年第4期507-517,共11页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51178353;91215302;51222809;2013CB036300)

摘　　要：采用理论分析及试验研究方法对风雨共同作用下的结构荷载与响应进行了研究。首先在确定风雨联合作用概率模型的基础上通过对降雨作用特性的分析,比较了雨滴冲击作用模型和空气密度等效变化模型对建筑结构等效静力的作用性能;其次,基于高精度风雨耦合荷载环境模拟试验设备,进行了风雨定常气动力荷载模型高频天平测力试验,研究了简单几何形体的风雨定常荷载变化规律;然后,采用二维悬挂系统测振试验方法,研究了风雨非定常气动力荷载模型及其结构振动响应特点;最后,对缆索承重桥梁拉索风雨激振现象进行耦合荷载环境参数精细化控制试验,揭示了拉索空间姿态、拉索动力特性、来流风速和不同雨强组合等条件对拉索风雨振的影响规律。The computational models and its parameter identification methods of wind-rain coupling loads on bridges and structures are presented in this paper with the aspects of joint probability distribution of wind and rain, wind and rain separated action and coupled effects on steady and unsteady forces. According to the calculation preciseness, the function of Gumbel and Copula has been selected to describe joint probability distribution of wind and rain intensity after various attempts. Firstly, Two type simple mathematic models have been tried in wind and rain separated action, including raindrop impact model and equivalent air density model, and both of them show the fact that it may be accurate enough to neglect rain influence while only considering direct rain loading action. Furthermore, through suspended 2-13 scaled models wind tunnel tests under the condition of wind and rain coupling loading environment, in which high-frequency dynamic force-measured balance and artificial rainfall system were utilized, showing that rain effect should not be neglected in steady and unsteady force models with considering coupled action of wind and rain on bridges and structures. Finally, using updated wind and rain coupling simulated equipment, systemic parameter analysis of wind-rain excited phenomena of stay cables were rechecked, illustrating the influence of spatial angle, dynamic character, in-coming wind velocity and different density combination of wind and rain.

关 键 词：拉素 风雨共同作用 气动力荷载 结构响应 风洞试验 

分 类 号：U488.25[交通运输工程—载运工具运用工程] TU973.21[交通运输工程—道路与铁道工程]