基于气动新模型的大跨度桥梁频域抖振分析  

A NEW AERODYNAMIC METHOD FOR LONG-SPAN BRIDGE BUFFETING ANALYSIS

作　　者：张志田[1] 葛耀君[2] 陈政清[1] 

机构地区：[1]湖南大学风工程试验研究中心,长沙410082 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《工程力学》2006年第6期94-101,共8页Engineering Mechanics

基　　金：国家自然科学基金资助项目(50278069)

摘　　要：提出采用准定常气动刚度与基于试验的非定常气动阻尼进行气动修正的大跨度桥梁抖振计算新模型。桥梁节段模型风洞试验表明,气动新模型能相对更准确地描述桥梁结构的气动刚度与气动阻尼特性。以东海大桥的风致抖振响应为例,对气动新模型与传统Scanlan颤抖振模型的分析结果进行了对比研究。计算结果与风洞试验表明,气动新模型具有良好的计算精度与明确的物理意义。Put forward a new method for long-span bridge buffeting analysis which using quasi-steady aerodynamic stiffness and unsteady aerodynamic damping based directly on wind tunnel test. The wind tunnel test of bridge Segment model shows that the new aerodynamic model can describe the aerodynamic stiffness and damping properties of bridge structure more accurately. As an example, both the numerical results of the new model and traditional flutter-buffeting model were presented and compared for East Sea Bridge under wind loads. The computed results and wind tunnel test results show that the new model gives accurate outcomes and has explicit physical meanings.

关 键 词：抖振 准定常 气动刚度 非定常 气动阻尼 

分 类 号：TU311.3[建筑科学—结构工程]