INELASTIC DISPLACEMENT RATIOS FOR STRUCTURES ON FIRM SITES
INELASTIC DISPLACEMENT RATIOS FOR STRUCTURES ON FIRM SITES
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DOI：
10.1061/(asce)0733-9445(2000)126:10(1150
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发表时间：
2000-10
期刊：
影响因子：
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通讯作者：
E. Miranda
中科院分区：
文献类型：
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作者：
E. Miranda
非弹性位移比的综合统计研究的结果，允许最大横向弹性位移需求的结构上的最大横向非弹性位移需求的估计。这些比率计算的单自由度系统进行不同程度的非弹性变形时，受到相对大量的记录地震地面运动。这项研究是基于264个加速度时程记录在坚定的网站在各种地震在加州。剪切波速度高于180米/秒的三种类型的土壤条件被认为是。振动周期的影响，水平的延性需求，现场条件，地震震级和震中距离进行了仔细的评估和讨论。与平均值相关的非弹性位移比。特别强调的是分散的结果。它的结论是，平均剪切波速度高于180米/秒的土壤条件的影响相对较小，可以忽略不计的设计目的的网站。最后，非线性回归分析的结果，提供了一个简化的表达式，用于在设计中近似平均非弹性位移比的结构在坚定的网站。
The results of a comprehensive statistical study of inelastic displacement ratios that permit the estimation of maximum lateral inelastic displacement demands on a structure from maximum lateral elastic displacement demands are presented. These ratios were computed for single-degree-of-freedom systems undergoing different levels of inelastic deformation when subjected to a relatively large number of recorded earthquake ground motions. The study is based on 264 acceleration time histories recorded on firm sites during various earthquakes in California. Three types of soil conditions with shear-wave velocities higher than 180 m/s are considered. The influences of period of vibration, level of ductility demand, site conditions, earthquake magnitude, and epicentral distance are carefully evaluated and discussed. Inelastic displacement ratios associated with mean values are presented. Special emphasis is given to the dispersion of the results. It is concluded that for sites with average shear-wave velocities higher than 180 m/s the influence of soil conditions is relatively small and can be neglected for design purposes. Finally, results from nonlinear regression analyses are presented that provide a simplified expression to be used in the design to approximate mean inelastic displacements ratios for structures on firm sites.