Seismic evaluation of existing structures is based on determining the damage likely to occur during the lifetime of these structures due to earthquake ground motion excitation. However, there is not a consensus about the acceptable level of seismic damage, the expected lifetime of these structures, and the seismic hazard level(s) to evaluate the structures at. This paper presents a methodology for a parametric calculation of the seismic collapse risk of an existing Reinforced Concrete (RC) frame building based on its seismic code compliance, quantified by a dimensionless metric. This metric, defined as compliance factor, compares the seismic capacity of an existing structure with the seismic demand for a new structure at a predetermined hazard level. The inelastic seismic behavior of four models of the RC frame building of varying compliance was analytically investigated in this study to demonstrate the novel methodology. The four models of the RC building were chosen to represent existing RC frame structures designed and constructed before the introduction of modern seismic code provisions. These four building models were excited by a group of earthquake ground motion excitations using Incremental Dynamic Analysis. The collapse probabilities of the four building models, representing varying values of seismic code compliance, were determined for two different locations corresponding to regions of moderate and high seismic hazard, thus laying the basis for the compliance-based estimation of the seismic collapse risk of existing structures.

现有结构的抗震评估基于确定在这些结构的寿命期间由于地震地震动激发可能发生的损坏。然而，对于可接受的地震损伤水平、这些结构的预期寿命以及评估结构的地震危险水平，并没有达成共识。本文提出了一种基于现有钢筋混凝土 (RC) 框架建筑的抗震规范合规性的地震倒塌风险参数计算方法，该方法通过无量纲度量进行量化。该指标定义为合规系数，将现有结构的抗震能力与预定危险级别的新结构的抗震需求进行比较。在本研究中，对不同柔度的 RC 框架建筑的四种模型的非弹性地震行为进行了分析研究，以证明这种新颖的方法。选择了 RC 建筑的四个模型来代表在引入现代抗震规范规定之前设计和建造的现有 RC 框架结构。这四个建筑模型是由一组使用增量动态分析的地震地面运动激发激发的。四种建筑模型的倒塌概率，代表了地震规范合规性的不同值，分别针对两个不同位置对应的中高地震危险性区域确定，从而为基于合规性估计现有地震倒塌风险奠定了基础。结构。