结构物耐震性能评估参数包括量测震度、工程需求参数、破坏计量和决策变数等，采机率地震危害分析逐项计算各参数之年超越机率。研究采用 EQWEAP 程序并配合性能设计理念和中国台湾地震危害曲线以及规范建议，探讨了中国台湾都会区之桩基耐震性能。研究范例以近年来中国台湾地区具有代表性地震为主，藉由中小、设计和最大考量地震之标的最大加速度和各地区相似地盘构造的测站纪录，推求不同地震等级的桩基最大位移和弯矩，并检视其破坏特性；透过大量的参数研究和专家判断，桩基的耐震性能指针即能制订，该项分析流程可作为其它地工构造物耐震分析参考。

The parameters used to evaluate seismic performance of the structures include Intensity Measured (IM), Engineering Demand Parameter (EDP), Damage Measure (DM) and Decision Variable (DV). One can compute the annual exceedance of these parameters based on probability analysis of seismic hazard. This study adopts the EQWEAP analysis with the concepts of performance based design and seismic hazard curves as well as design codes to investigate the seismic performance of piles at Taiwan metropolitans. The representative earthquakes were selected. The largest pile displacements and moments were computed at various levels of earthquakes considering small to moderate design and maximum acceleration of maximum consideration EQs at different target PGAs and foundation sites of similar velocity profile. Applying with massive parametric analysis and specialist judgments, the indices for seismic performance of the pile foundation could be made. The corresponding analytical procedures can be applied to other geotechnical structures.