在基于排水量的地震设计,无弹性的排水量比率系列(IDRS ) 为从它的对应物的最大的有弹性的排水量需求估计一个非线性的 SDOF 系统的最大的侧面的无弹性的排水量需求是特别地有用的线性有弹性的 SDOF 系统。在这研究,为近差错的脉搏类型地面运动的 IDRS 的特征基于很多地震地面运动被调查。地点条件,到山峰地面加速(针网阵列) 的山峰地面速度(PGV ) 的比率, PGV,和 IDRS 上的最大的增长速度(MIV ) 的影响也被评估。结果显示 IDRS 上的近差错的地面运动的效果在在 0.2 s 之间的时期仅仅是重要的 - 1.5 s,在扩大能接近 20% 的地方。PGV/PGA 比率在考虑的参数之中在 IDRS 上有最重要的影响。地点条件仅仅稍微影响 IDRS,这也被发现。
In displacement-based seismic design, inelastic displacement ratio spectra (IDRS) are particularly useful for estimating the maximum lateral inelastic displacement demand of a nonlinear SDOF system from the maximum elastic displacement demand of its counterpart linear elastic SDOF system. In this study, the characteristics of IDRS for near-fault pulse-type ground motions are investigated based on a great number of earthquake ground motions. The influence of site conditions, ratio of peak ground velocity (PGV) to peak ground acceleration (PGA), the PGV, and the maximum incremental velocity (MIV) on IDRS are also evaluated. The results indicate that the effect of near-fault ground motions on IDRS are significant only at periods between 0.2 s - 1.5 s, where the amplification can approach 20%. The PGV/PGA ratio has the most significant influence on IDRS among the parameters considered. It is also found that site conditions only slightly affect the IDRS.