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Global damage indexes for the seismic performance assessement of RC structures

机译：RC结构抗震性能评估的整体破坏指标

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摘要

When performing the seismic risk assessment of new or existing buildings, the definition of compact indexes able to measure the damaging and safety level of structures is essential, also in view of the economic considerations on buildings rehabilitation. This paper proposes two series of indexes, named, respectively, Global Damage Indexes (GDIs), which are representative of the overall structure performance, and Section Damage Indexes (SDIs), which assess the conditions of reinforced concrete (RC) beam-column sections. Such indexes are evaluated by means of an efficient numerical model able to perform nonlinear analyses of the RC frame, based on the continuum damage mechanics theory and fiber approach. An improvement of a two-parameter damage model for concrete, developed by some of the authors, which guarantees a better correlation between the Local Damage Indexes (LDIs) and the material's mechanical characteristics, is also presented. For the reinforcement, a specific LDI, named 'steel damage index', which takes into account the plastic strain development and the bar buckling effect, is proposed. The numerical model has been employed to simulate several experimental tests, in order to verify the accuracy of the proposed approach in predicting the RC member's behavior. Nonlinear static and dynamic analyses of two RC frames are carried out. The robustness of the method, as well as the effectiveness of the GDIs in assessing the structural conditions, are demonstrated here. Finally, comparisons between the evolution of GDIs and the achievement of the performance levels as proposed in FEMA 356 are reported.
机译：在进行新建筑物或现有建筑物的地震风险评估时，考虑到建筑物修复的经济因素，定义能够测量建筑物的破坏和安全水平的紧凑指标至关重要。本文提出了两个系列的指标，分别命名为代表整体结构性能的整体损坏指数（GDI）和用于评估钢筋混凝土（RC）梁柱截面状况的截面损伤指数（SDI）。 。基于连续损伤力学理论和纤维方法，借助于能够对RC框架进行非线性分析的有效数值模型来评估这些指标。还提出了一些作者对混凝土的两参数损伤模型的改进，该模型保证了局部损伤指数（LDI）与材料的机械特性之间具有更好的相关性。对于钢筋，提出了一种特定的LDI，称为“钢损伤指数”，其中考虑了塑性应变的发展和钢筋的屈曲效应。数值模型已被用来模拟几个实验测试，以验证所提出的方法在预测钢筋混凝土构件行为方面的准确性。对两个RC框架进行了非线性静态和动态分析。这里展示了该方法的鲁棒性以及GDI在评估结构条件方面的有效性。最后，报告了FDI 356中提出的GDI演变与性能水平实现之间的比较。

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