考虑多分量气动导纳的抖振响应敏感性  

Buffeting response sensitivity analysis considering multi-component admittance function

作　　者：赵林[1] 葛耀君[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：《振动与冲击》2010年第2期84-88,共5页Journal of Vibration and Shock

基　　金：科技部国家重点实验室基础研究资助项目(项目编号:SLDRCE08-C-02);国家自然科学基金委重大研究计划重点研究项目(90715039)

摘　　要：对于类流线型箱梁桥梁断面,采用抖振频域分析方法和气动弹性节段模型测振风洞试验,初步验证了互谱法识别的多分量气动导纳函数结果的正确性和工程适用性。结合可靠度理论敏感性算法,系统评价了来流风速参数、模型参数、静风力系数、导纳函数和颤振导数等对于二维节段模型抖振响应的贡献率分布关系,更正了工程应用中采用单一分量导纳函数假定带来的对抖振气动力表达式认识上偏差。Multi-component admittance function of a typical streamline box girder was identified using correlation spectrum method in wind tunnel testing,then its precision and engineering applicability were validated basing on a 2-D buffeting frequency domain algorithm and vibration-measuring tests with a sectional model in a wind tunnel.Combining a sensitivity algorithm in the reliability theory,the distributions about buffeting response contributions of some key parameters,such as,wind velocity,model geometric size,static wind load coefficient,admittance function component and fluttering derivatives,etc.,were evaluated and compared systematically,and some new understanding and conclusions about traditional buffeting aerodynamic expressions were illustrated.

关 键 词：类流线型箱梁 多分量导纳函数 风洞试验 敏感度 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]