一种基于滞变阻尼假定的混合结构抗震计算模态叠加法

黏滞阻尼假定导致现行用于混合结构抗震计算的时程分析方法存在不足.滞变阻尼假定与试验结果相符,克服了黏滞阻尼假定的缺陷.该文提出一种基于滞变阻尼假定的模态叠加法,对单一材料结构和混合结构皆适用,其阻尼矩阵构造方法简单、构造工作量小、物理意义明确,回避了基于黏滞阻尼假定时计算阻尼矩阵需要事先确定若干响应较为显著频率问题和需...

A mode superposition method for seismic calculation of hybrid structures based on hysteretic damping assumption

The viscous damping assumption leads to several disadvantages of the current time-history analysis methods used in the seismic calculation of hybrid structures. The hysteretic damping assumption can produce more consistent results with the experimental ones and overcomes the shortcomings of the viscous damping assumption. In the present study, a mode superposition method, which is applicable to both single-material structure and hybrid structure, is proposed based on hysteretic damping assumption, and in the proposed method the creation of damping matrix is simple with less workload and clear in the physical meaning. Additionally, in the proposed method, the trouble of pre-determining a few significant frequencies of the response when calculating the damping matrix based on the viscous damping assumption and the difficulty of calculating the modal damping ratio can be obviated, so that the classical mode superposition method used in the seismic calculation of hybrid structures can be improved effectively and more reasonable results, which are more consistent with the failure mode of model shaking table test, can be achieved.