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Seismic behavior of irregular reinforced-concrete structures under multiple earthquake excitations

机译：多次地震激励下不规则钢筋混凝土结构的抗震性能

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Reconnaissance studies on the recent Tohoku earthquake have reported collapse of structures due to multiple earthquake excitations in the earthquake-affected region. Strength and stiffness degradation is shown to be the primary reason for the observed damage. The present study aims to investigate the degrading behavior of irregularly built reinforced concrete structures subjected to the Tohoku ground motion sequences. Three-dimensional numerical models of three irregular reinforced concrete structures are developed. The structural characteristics of these buildings are then altered to achieve a regular case. The models contain appropriate damage features that can capture both the irregularity and material deterioration effects. The capacities of both cases are evaluated using the N2 and extended N2 procedures. The degrading models are then used for ground motion sequences measured at 23 selected stations. The results indicate that multiple earthquake effects are significant, and irregularity effects increase the dispersed damage under these excitation sequences.
机译：最近的东北地震的侦察研究报告说，由于地震影响地区多次地震激发，建筑物坍塌了。强度和刚度的降低是观察到损坏的主要原因。本研究旨在研究受东北地面震动影响的不规则建筑钢筋混凝土结构的降解性能。建立了三种不规则钢筋混凝土结构的三维数值模型。然后更改这些建筑物的结构特征，以达到常规效果。这些模型包含适当的损坏特征，可以同时捕获不规则性和材料劣化影响。使用N2和扩展N2程序评估这两种情况的能力。然后将降级模型用于在23个选定站点测量的地面运动序列。结果表明，多重地震效应是显着的，而不规则效应则增加了这些激励序列下的分散破坏。

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