两种阻尼模型对结构动力特性影响的能量分析

Analysis of dynamic characteristics of two damped structures by energy method

采用能量分析法,对基于线性阻尼模型和能量型非线性阻尼模型的结构共振特性和地震响应进行研究.通过对一柱状结构的计算分析,得出结论:对于线性阻尼模型,当激励荷载的频率与结构系统自振频率很接近时,结构的能量响应会出现非常大的突变,即存在能量共振;对于能量型非线性阻尼模型不存在能量共振,且能量型非线性阻尼模型具有较强的抗震耗能能力.

Based on the energy method, the resonant characteristics and seismic response of the linearly damped structure and the nonlinearly damped energy structure were analyzed. Reasonable conclusions were drawn from the result of an example of a column structure. It is found that the energy response of the linearly damped structure will experience enormous increment when the frequency of excitation loads is very close to the natural frequency of the structure, i.e. energy resonance occurs. The nonlinearly damped energy model does not experience energy resonance, and it is of high antiseismic capability.