【摘要】 首先根据组合结构的特点,通过输入简谐波分别计算了3种等效振型阻尼比模型时组合结构的地震反应,并与非比例阻尼模型时的真实地震反应相比较,讨论了不同等效振型阻尼比模型对组合结构地震反应的影响;然后根据共振条件下结构动力反应的相对误差,推导了组合结构等效振型阻尼比的估算公式;最后通过输入简谐波和实际El Centro地震波验算了这一等效振型比例阻尼比模型的计算精度。结果表明:任意假定组合结构的等效振型阻尼比是不合理的,有时会低估组合结构的地震反应;该估算方法具有很高的计算精度。更多还原

【Abstract】 Firstly,according to the characteristics of composite structures,the seismic responses of composite structure with three models of equivalent modal damping ratio were respectively calculated under the excitation of harmonic waves.The influence of different equivalent modal damping ratio models on the seismic responses was discussed by comparing with the real seismic responses of composite structure with non-proportional damping model.Then, an estimating formula to evaluate equivalent modal damping ratio was derived according to the relative errors of the structural dynamic responses under resonant condition.Finally,the calculation precision of the equivalent modal damping ratio was proved by the dynamic responses of composite structure under the excitation of harmonic waves and real El Centro seismic waves.The results show that the equivalent modal damping ratio assumed at will is not reasonable and will lead to underestimate the seismic responses of composite structure and the method has high precision.更多还原