两种阻尼模型对结构动力特性影响的能量分析
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摘要
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 nonlinearly 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 nonlinearly damped energy model does not experience energy resonance, and it is of high antiseismic capability.
Based on the energy method, the resonant characteristics and seismic response of the linearly damped structure and the nonlinearly 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 nonlinearly damped energy model does not experience energy resonance, and it is of high antiseismic capability.
引文
[1]胡海岩.结构阻尼模型及系统时域动响应[J].应用力学学报,1993,10(1):35—43.
[2]陈德臣,白洁,罗华耿.关于一类非线性阻尼模型控制问题的一个注记[J].应用力学学报,1995,12(4):113—117.
[3]ZHANGW.Frequencyresponseofnon linearlydampedflexiblestructures[J].IntJofConfr,1991,54(1):135—155.
[4]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1989.
[5]谢能刚,邵韦循,王彪.基于提高动稳定性的拱坝拱圈结构抗震优化设计[J].水利水运工程学报,2001(4):41—44.
[2]陈德臣,白洁,罗华耿.关于一类非线性阻尼模型控制问题的一个注记[J].应用力学学报,1995,12(4):113—117.
[3]ZHANGW.Frequencyresponseofnon linearlydampedflexiblestructures[J].IntJofConfr,1991,54(1):135—155.
[4]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1989.
[5]谢能刚,邵韦循,王彪.基于提高动稳定性的拱坝拱圈结构抗震优化设计[J].水利水运工程学报,2001(4):41—44.
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