关于桥梁结构的气动导纳

A Review of Aerodynamic Admittance Functions of Bridge Structures

结构的抖振响应由结构上的抖振力决定 ,而结构上的抖振力又由结构的气动导纳函数和阵风谱决定。基于片条假设的Sears’气动导纳函数未能反映阵风在桥跨方向上的相关特性。三维气动导纳 (3DAAF)的分析表明气动导纳函数受结构的特征尺寸、阵风场特性和折算频率影响。

Buffeting responses of structures are excited by buffeting forces, which are determined by the aerodynamic admittance function (AAF) of structures and power spectrum density of turbulence., the Sear's function, which is based on the strip assumption, fails to account for the coherence of the turbulence along the span. It is shown by the analysis that 3 dimensional AAF (3DAAF) is affected by the dimensions of the structure, the characteristic of the turbulent field and the reduced frequencies. The taut strip test also shows that 3DAFF accords better with the facts met in civil engineering.