【摘要】 液化场地的地震动具有特殊性，明晰其对上部结构破坏的影响，是工程合理抗震设防的基础。以实际震害资料为背景，通过典型建筑物易损性分析，揭示液化场地地震动对工程结构破坏的影响机制与实际作用。以2011年新西兰6.3级地震震害调查为背景，提取液化场地和非液化场地地震动实测记录，并建立一层民居和六层结构两种典型建筑物易损性分析模型。基于国际上通用的OpenSees计算程序，采用地震动实测记录，分别计算结构在液化与非液化场地地震动作用下的结构易损性，以二者之差作为液化所引起的结构易损性增量，并与实际震害进行对比，提出液化场地地震动对两种典型建筑物震动响应的影响机制与影响程度。成果可深化液化场地对工程结构破坏影响的认识，同时可为推动液化场地工程结构抗震设计理论的发展提供指导。更多还原

【Abstract】 Ground motions at liquefied sites exhibit distinct characteristics. Clarifying their impact on the damage to superstructures is fundamental for rational seismic fortification in engineering. Using actual seismic-damage data, this study reveals how ground motions at liquefied sites influence structural damage via fragility analysis of typical building types. Against the backdrop of the 2011 M6.3 earthquake in New Zealand, we have compiled actual seismic records from both liquefiable and non-liquefiable sites, and constructed fragility analysis models for two archetypal buildings: a single-story residence and a six-story structure. Using the widely used OpenSees software, we compute the seismic fragility of structures under records from liquefied and non-liquefied sites, respectively. The difference between the results is defined as the fragility increment due to liquefaction and is compared with observed seismic damage. The influence mechanism and degree of seismic ground motion in liquefiable sites on the vibration response of two typical buildings are proposed. The findings enhance the understanding of the influence of liquefied sites on engineering structural damage and can provide guidance for advancing the theoretical development of seismic design for structures on liquefiable sites.更多还原