【摘要】 结构强度折减系数是基于强度抗震设计法中确定设计地震作用的关键。我国现行《建筑抗震设计规范》[1](GB 50011—2010,简称《规范》)对不同的结构体系采用单一的强度折减系数,不尽合理。在已有强度折减系数方法基础上,提出了以中震位移限值为极限位移的改进间接确定强度折减系数方法,将其应用于钢框架结构强度折减系数中,并与直接强度折减系数方法进行对比分析,验证了此方法的有效性和准确性,研究表明钢框架结构强度折减系数不受建筑层数的影响,其强度折减系数接近于4。更多还原

【Abstract】 Structural strength reduction factor is the key to determine earthquake action in strength-based seismic design.The Code for Seismic Design of Buildings(GB 50011—2010)specifies a uniform strength reduction factor for various structure systems,and this may not be reasonable in many situations.This paper presents an improved strength reduction approach utilizing displacement as criteria in moderate earthquakes.The accuracy of the proposed approach is verified through comparing with results from the direct strength reduction approach.The design examples show that strength reduction factor of the steel frame is not related to the number of stories,and the strength reduction coefficient for multi-story steel frames is close to 4.更多还原