（中北大学土木工程学科管理部, 太原 030051）

［摘要］我国《建筑抗震设计规范》（GB 50011—2010）并未给出交错桁架结构的结构影响系数的具体数值。为明确其结构影响系数的取值，依据相应的规范设计了3个层数为4层、8层和12层的交错桁架结构模型，通过MIDAS Gen软件中的推覆(Pushover)分析得出结构的能力谱曲线，再通过能力谱法得出弹塑性需求谱曲线。将结构的能力谱曲线和弹塑性需求谱曲线族绘制于同一坐标系中，通过试算确定结构的目标位移及求解结构影响系数和位移放大系数的相关点的坐标。根据性能点处的指标评估结构的抗震性能，并求出结构影响系数的值。研究表明：对于选取适当构件截面的交错桁架结构在设防烈度地震和罕遇地震作用下的变形均满足抗规要求；建议交错桁架结构的结构影响系数和位移放大系数宜分别取值为3.0和5.0；通过塑性铰分析，交错桁架空腹处的梁对结构的性能有重要的影响。

［关键词］交错桁架体系； 结构影响系数； 位移放大系数； Pushover分析

中图分类号：TU398-1文献标识码：A文章编号：1002-848X(2020)13-0084-05

Study on structural influencing coefficient of staggered truss steel framing system

ZHENG Liang, QIN Cheng, GUO Hong, ZHANG Dapeng, GENG Shaobo

（School of Civil Engineering, North University of China， Taiyuan 030051， China）

Abstract:The Code for seismic design of building(GB 50011—2010) do not provide specific values for the structural influence coefficient of the staggered truss steel framing systems.  In order to clarify the value of the structural influence coefficient, three staggered  truss steel framing system models with 4 layers, 8 layers, and 12 layers were designed according to the corresponding specifications. The capacity spectrum curve was obtained through Pushover analysis in MIDAS Gen software，and the inelastic demand spectrum curve was obtained through the capability spectrum method. The capacity spectrum curve and inelastic demand spectrum curve of the structure were drawn in the same coordinate system, and the coordinates of the relevant points of the structure′s target displacement, structural influencing coefficient and structural displacement amplification factor were determined through trial calculation. The seismic performance of the structure was evaluated according to the index at the performance point, and the value of the structural influencing coefficient was obtained. It is shown that: the deformation of staggered  truss steel framing systems in the fortification earthquake and rare earthquake conform to the code for seismic design of buildings requirements. The structural influencing coefficient and displacement amplification factor are respectively recommended to be 3.0 and 5.0. Through the plastic hinge analysis, the beam at the open-web truss has an important influence on the performance of the structure.

Keywords:staggered truss steel framing system; structural influencing coefficient; displacement amplification factor; Pushover analysis

*国家自然科学基金青年科学基金项目（51408558）。

作者简介：郑亮，博士，讲师，Email:zl_5403@126.com。