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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。
The structural strength reduction factor is the key to determine the seismic action of design based on the strength seismic design method. China’s current “Code for Design of Seismic Design of Buildings” [1] (GB 50011-2010, “Specification”) uses a single strength reduction coefficient for different structural systems, which is not reasonable. Based on the existing method of strength reduction coefficient, a method of indirectly determining the strength reduction factor by using the mid-seismic displacement limit as the limit displacement is proposed. The method is applied to the strength reduction factor of steel frame structure and is compared with the direct strength reduction The results show that the strength reduction factor of steel frame structure is not affected by the number of building layers, and the strength reduction coefficient is close to 4.