Adjustment method for elastic time-history analysis of structures considering period reduction
The problem that the period reduction cannot be considered in a structural time-history analysis was studied.Structural time-history analyses considering and neglecting the period reduc-tion were compared,and then the amplification coefficient was proposed to amplify the effective peak acceleration of the input ground motion and the seismic response in time-history analysis to consider the amplification effect of period reduction on the structural seismic response in elastic time-history analysis.The influences of involved parameters on the amplification coefficient were studied theoretically.Then,the adjustment effects and differences between the two adjustment methods were compared on the basis of the single-degree-of-freedom system.Moreover,an engi-neering example was used to verify the effectiveness of the proposed methods considering period reduction in the elastic time-history analysis.The results show that the value of the amplification coefficient is related to the period reduction coefficient,the natural vibration period of the struc-ture,and the characteristic period of the site.For the single-degree-of-freedom system,the two adjustment methods have identical adjustment effects.The seismic shear force and story drift ra-tio of each floor of the example structure obtained using the elastic time-history analysis are near those calculated by the response spectrum considering the period reduction.
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维普
