考虑多分量气动导纳的抖振响应敏感性

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。

Buffeting response sensitivity analysis considering multi-component admittance function

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 parame-ters, such as, wind velocity, model geometric size, static wind load coefficient, admittance function component and flutte-ring derivatives, etc. , were evaluated and compared systematically, and some new understanding and conclusions about traditional buffeting aerodynamic expressions were illustrated.