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Assessment indices for the seismic vulnerability of existing R.C. buildings

机译：现有钢筋混凝土地震脆弱性的评估指标建筑物

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摘要

The seismic vulnerability of old multi-storey reinforced concrete (R.C.) buildings reinforced with substan-dard details is assessed as a function of interstorey drift demand imposed by the design earthquake while considering brittle termination of elastic response of the critical members of the structure due to a prema-ture shear failure. Interstorey drift demand is related to column and wall translational stiffnesses which are expressed through analytical derivations in terms of the floor area ratios of gravity and lateral load bearing members in the critical floor. Interstorey drift capacity is related to the available transverse reinforcement and the axial load ratio of the vertical members. The significance of the area ratio of vertical members in the typical floor as an index of vulnerability is explored with reference to the limitations in the value of axial load ratio used in R.C. design in order to secure ductile flexural behavior, and also with reference to the stability index of gravity load bearing members. Interstorey Drift Spectra are derived for the existing R.C. buildings suitable for rapid seismic vulnerability screening but also as a guide for rehabilitation of the existing structures. Lightly reinforced or substandard reinforced concrete buildings that reportedly collapsed during previous earthquakes are used as example case studies in order to calibrate the proposed methodology.
机译：考虑到设计地震施加的层间漂移需求，同时考虑到结构的关键构件的弹性响应的脆性终止，评估了具有实质细节的旧多层钢筋混凝土（RC）建筑的地震脆弱性。过早的剪切破坏。层间漂移需求与柱和墙的平移刚度有关，这些刚度通过分析推导以临界楼板中的重力和侧向承载构件的楼板面积比表示。层间漂移能力与可用的横向钢筋和垂直构件的轴向载荷比有关。参照R.C中使用的轴向载荷比值的局限性，探讨了典型地板中垂直构件的面积比作为易损性指标的重要性。为了确保延性挠曲行为而设计，并且还参考重力承载构件的稳定性指标。层间漂移谱是针对现有R.C.适用于快速地震脆弱性筛查的建筑物，也可作为现有结构修复的指南。据报道，在先前地震中倒塌的轻度钢筋或不合格钢筋混凝土建筑被用作示例案例研究，以校准所提出的方法。

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