【摘要】 我国抗震规范GB 50011—2001采用"三水准设防"、"二阶段设计"的办法,在小震下进行承载力设计和弹性变形验算,在大震下进行弹塑性变形验算,以保证"小震不坏","大震不倒"。但在"中震可修"水准上并没有给出具体量化的性能指标。文中以层间位移角作为性态指标,将"中震可修"性态目标划分为"轻微损坏"和"中等破坏"两阶段。采用结构三维非线性动力分析程序CANNY对一按现行规范设计的框架结构进行了计算,得出了该结构在中震作用下的变形及破坏情况,分析了按现行规范设计的该框架在中震下的性态以及是否中震可修,并在此基础上进行的一典型框架在上述两性能目标下的设计,得出了各性能目标下的结构内力、变形及破坏情况,以及结构所需的截面尺寸及配筋情况,对实行多性态设计有一定的参考价值。更多还原

【Abstract】 China seismic code(GB 50011—2001) adopts "three levels","two-stages-design"method to prevent structures from destroy under minor earthquake and collapse under major earthquake,which is doing capacity design and elastic deformation checking under minor earthquake firstly then checking elastoplastic deformation under major earthquake.However,it did not give the specific and quantitative performance index to ensure structures repairable under moderate earthquake.Using the interstory displacement as the performance index,two performance objectives under moderate earthquake "slight damage" and "medium damage" were proposed in this paper.Using 3-Dimensional Nonlinear Dynamic Structural Analysis Program(CANNY),the time-history analysis was perfomed for a RC frame structure,which was designed according to the existing seismic design code,to gain the deformation and damage state under moderate earthquake and to check whether it is repairable under moderate earthquake.Based on this,a typical frame structure was designed and analyzed under the two performance objectives,the characteristics of internal force,deformation,damage,section size and reinforcement ratio between the two performance objectives were obtained,which would be a guide to design of structures under multi-performance-objectives.更多还原