【摘要】 以汶川县威州镇一幢既有典型混凝土框架结构房屋为研究对象,分析了当地现有混凝土结构的抗震安全水平。采用《建筑抗震设计规范》(GB 50011—2010)设定的设防烈度及地震水平,对混凝土结构进行非线性时程分析,建立了该结构的概率地震需求模型。依据该模型确定结构地震易损性水平,建立继续使用、严重破坏和倒塌3种状态下结构的地震易损性曲线,以此研究汶川县此类结构设计的抗震安全水平。研究结果表明:此类既有混凝土框架结构不能完全满足《建筑抗震设计规范》(GB 50011—2010)中不同抗震设防等级关于房屋破坏和倒塌的基本要求。更多还原

【Abstract】 A typical existing reinforced concrete(RC) frame structure in Weizhou Town,Wenchuan County was studied to review the seismic safety levels of local RC frame building.The adopted assessment levels of earthquake ground motions were produced according to the local fortification intensity in Chinese Code for Seismic Design of Buildings(GB 50011—2010).By using nonlinear finite element method,probabilistic seismic demand model(PSDM) for RC frame structure was built.The seismic fragility curves for immediate occupancy,significant damage,and collapse prevention damage levels of the RC frame building were analyzed.Then,the seismic fragility assessment of the RC frame was discussed to assess the safety levels of the actual RC frame structure of design in Wenchuan County.The research results indicate that the existing RC frame structure in Wenchuan County would unlikely meet the structural damage and collapse prevention performance objectives in related earthquake hazard levels that are found in guidelines for performance-based earthquake engineering in Code for Seismic Design of Buildings(GB 50011—2010).更多还原