ABSTRACT

The close proximity of some populated cities all over the world to the active faults shows the necessity to investigate the consequences of the prominent characteristics of near-fault pulse-like ground motions (i.e., the forward directivity and fling-step) on the seismic performance of the code-compliant multi-story buildings. This paper attempts to quantify the effects of pulse-like near-fault ground motions on the seismic responses of reinforced concrete (RC) moment-resisting frame (MRF) buildings and to compare the results with those induced by non-pulse-like ground motions. For this purpose, three archetype buildings with 3-, 9-, and 18-story heights were designed in accordance with the provisions of ASCE 7–10 and were subjected to 48 ground motions in four sets including the forward-directivity, fling-step, non-pulse near-fault, and far-fault records. The results demonstrate that the contribution of higher modes to the seismic responses is more predominant in the non-pulse-like ground motions than their pulse-like counterparts. Moreover, the maximum seismic demands imposed by the pulse-like ground motions are higher than those for the non-pulse-like motions. A detailed assessment of the seismic performance of the RC buildings based on Tier 3 systematic evaluation of the ASCE 41–17 standard is another objective of this study. Findings from this evaluation reveal that the 3-story frame fails to meet the acceptance criteria under the pulse-like ground motions, whereas both the 9- and 18-story frames satisfy the performance criteria of ASCE 41–17 for both the pulse-like and non-pulse-like ground motions. This indicates that the performance of the buildings designed in accordance with ASCE 7–10 does not necessarily satisfy the performance expected in ASCE 41–17.

摘要

全世界一些人口稠密的城市都与活动断层非常接近，这表明有必要研究近断层脉冲状地面运动的突出特征（即，前向指向性和猛冲阶跃）对地震性能的影响。符合代码的多层建筑物。本文试图量化脉冲状近断层地震动对钢筋混凝土（RC）抗弯框架（MRF）建筑物的地震响应的影响，并将其结果与非脉冲状地震动的影响进行比较。为此，根据ASCE 7-10的规定，设计了3层，3层，9层和18层高的原型建筑，并对它们进行了四组48次地面运动，包括正向性，俯冲阶跃，非脉冲近故障，和故障记录。结果表明，较高模式对地震响应的贡献在非脉冲状地震动中比其脉冲状地震动更为突出。而且，由脉冲状地震动施加的最大地震需求高于对于非脉冲状地震动的需求。基于ASCE 41-17标准的方法3的系统评估，对RC建筑物的抗震性能进行详细评估是本研究的另一个目标。从评估中发现，三层框架在脉冲状地面运动下无法满足验收标准，而9层和18层框架在脉冲状地面运动中均满足ASCE 41-17的性能标准。和非脉冲状的地震动。