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达到位移目标时确定结构的地震需求,是性能抗震设计的一个重要课题。研究了结构位移目标,确定了位移性能目标参数,推导了单自由度结构体系的位移性能目标与周期的关系。将1085条地震波,输入到不同周期的单自由度弹塑性动力微分方程,调整地震动,反复迭代,达到位移目标,获得地震需求与周期、位移目标之间的函数关系,建立了具有统计意义的三维坐标下的性态谱,并拟合了性态谱的计算公式。研究表明:性态谱是反映不同位移目标下结构地震需求的一种有效方法。性态谱曲线随着结构周期的增大明显减小,并随着位移目标的增大,逐渐增大。性态谱曲线已无平台段,与场地的共振效应消失,场地对性态谱的影响总体不明显。性态谱可快速地、简便易行地预测达到不同性能目标时结构的地震需求,拟合的性态谱计算公式可进行结构抗震性能评估。
It is an important issue of performance seismic design to determine the seismic demand of the structure when reaching the target of displacement. The displacement target of structure is studied, the target parameter of displacement performance is determined, and the relationship between displacement target and period of single-degree-freedom structure system is deduced. 1085 seismic waves are input to different degrees of single-degree-freedom elasto-plastic dynamic differential equations to adjust ground motion and iteratively iteratively to reach the displacement target. The functional relationship between seismic demand and period and displacement target is obtained, and a statistically significant Three-dimensional coordinates of the state spectrum, and fitting the formula of the state spectrum. The results show that the state spectrum is an effective method to reflect the earthquake demand under different displacement targets. The spectral curve decreases with the increase of structural period, and increases with the increase of displacement target. There is no plateau in the state spectrum curve, and the resonance effect with the site disappears. The influence of site on the spectrum of the condition is not obvious. The state spectrum can be used to predict the seismic demand of structures with different performance targets quickly and easily. The formula of the fitted state spectrum can be used to evaluate the seismic performance of structures.