An improved response surface method (RSM) for the seismic fragility analysis of base-isolated structures is proposed so that the correlation of seismic demands on the structural components can be effectively considered. In addition, the performance levels of base-isolated structure as well as the associated quantitative indices for various structural components are discussed and defined. Taking a typical base-isolated reinforced concrete plane frame with lead-rubber-bearings as an illustrative example, the seismic fragility analysis following the computational procedure based on the improved RSM are conducted. Through the illustrative example, it is demonstrated that the obtained response surface models for the seismic demands on the components as well as the correlation of components are accurate and reliable; moreover, the computational cost for the system seismic fragility analysis is significantly reduced due to the use of Monte Carlo simulation; finally, it is indicated that it is necessary to take into account the correlation of components in order to obtain more accurate system fragility curves of base-isolated structure.

中文翻译：

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考虑结构构件地震需求相关性的基础隔震结构脆性分析的改进响应面法

提出了一种改进的响应面法（RSM），用于基础隔震结构的地震脆性分析，从而可以有效地考虑地震对结构构件的需求。此外，讨论并定义了碱基隔离结构的性能水平以及各种结构组件的相关定量指标。以典型的基础隔震钢筋混凝土平面框架为例，以改进的RSM为基础，按照计算程序进行了地震脆性分析。通过算例表明，所获得的构件地震需求响应面模型以及构件之间的相关性是准确可靠的。此外，由于使用了蒙特卡洛模拟，大大降低了系统地震易损性分析的计算成本；最后，表明有必要考虑组件的相关性，以获得更精确的基础隔离结构的系统脆性曲线。