【提要】 根据钢结构错列桁架的组成特点，推导出评定水平荷载作用下扭转效应系数的计算公式，并通过模型计算考察《高层民用建筑钢结构技术规程》(JGJ99—98)第3.2.2条是否适用于钢结构错列桁架。计算结果表明：规程第3.2.2条的判定条件并不适用于钢结构错列桁架体系，计算时应该考虑结构扭转的影响。
【关键词】 错列桁架 扭转效应 钢结构设计
Torsional Effect Evaluation of Steel Staggered Truss System/Lu Linfeng1,Gu Qiang2,Su Mingzhou3,Zhou Tianhua1(1 Changan University,Xian 710061,China; 2 Suzhou University of Science and Technology,Suzhou 215011,China; 3 Xian University of Architecture and Technology,Xian 710055,China)
Abstract:According to the composition characteristics of steel staggered truss under leve
l load,the calculating formula of the torsional effect coefficient was derived,and it investigates whether the clause 322 of the Technical specification for steel structure of tall building(JGJ99—98) is applicable to the steel staggered truss or not.The calculating result indicates that the specification is not applicably,and the torsional influence should be considered.
Keywords:staggered truss; torsional effect; steel structure design
*陕西省自然科学基金资助项目(20013C1)。
1)长安大学，西安，710061；2)苏州科技学院，215011；3)西安建筑科技大学，710055。