1) 西安建筑科技大学，710055； 2)中国建筑西北设计研究院，西安，710003；3)苏州科技

学院，215011

［提要］结构影响系数主要包括延性折减系数和超强系数。给出了按我国抗震规范设计的几个典型抗弯钢框架结构，采用弹塑性时程分析方法确定了结构的整体能力曲线。考虑了结构层数、跨数等对结构延性和超强能力的影响，给出了在典型地震波作用下的各结构的结构影响系数值。建议在我国的结构抗震设计中，抗弯钢框架的结构影响系数最小值可取4。

［关键词］抗弯钢框架；结构影响系数；延性；超强；弹塑性时程分析方法

Research on Structural Influencing Coefficient of Moment-resisting Steel Frames/Li Cheng1, Xu Bairong2, Gu Qiang3(1 College of Civil Engineering, Xi"an University of Architecture ＆ Technology, Xi"an 710055, China; 2 Northwest Building Design and Research Institute, Xi"an 710003, China; 3 University of Science and Technology of Suzhou,Suzhou 215011, China)

Abstract:The structural influencing coefficient includes ductility reduction factor and overstrength factor.The moment-resisting steel frames are designed according to Chinese seismic code, and inelastic time history analysis has been performed on these steel frames to get the global capacity envelopes of structures. Involving effects of the number of stores and spans on structural ductility and overstrength capability, the structural influencing coefficient values are determined for moment-resisting steel frames under the action of the typical seismic wave.It is proposed that the minimum structural influencing coefficient value can be 4 for moment-resisting steel frames in Chinese earthquake resistant design of structure.

Keywords:moment-resisting steel frames; structural influencing coefficient; ductility; overstrength; inelastic time history analysis

*国家自然科学基金资助项目(50578099)。