（1 北京工业大学建筑工程学院， 北京 100124； 2 中冶京诚工程技术有限公司， 北京 100176；3 华诚博远工程技术集团有限公司， 北京 100052）

［摘要］在阐述《钢结构设计标准》（GB 50017—2017）等规范中与空间网格结构设计相关的稳定性设计规定的基础上，以某跨度为155m的含预应力索的空间拱桁架结构为例，对直接分析法和有效长度法的设计结果进行了比较。结果显示，在按应力比1.1进行计算长度法设计之后，再采用直接分析法进行杆件的验算和截面微调，可以使结构既满足直接分析法稳定性要求，又可较应力比为1.0的计算长度法设计结果节省4.5%的用钢量。

［关键词］直接分析法； 大跨度； 钢结构； 预应力索； 空间拱桁架

中图分类号：TU318+.1文献标识码：A文章编号：1002-848X(2021)01-0045-05

Application of direct analysis design method in cable structure design

YU Zheng1,2, XUE Suduo1, WANG Lijun3

(1 College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China; 2 MCC Capital Engineering & Research Incorporation Limited, Beijing 100176, China; 3 Huachengboyuan Engineering Technology Group Co., Ltd., Beijing 100052, China)

Abstract:Based on the description of the Standard for design of steel structures (GB 50017—2017) and other specifications related to the stability design requirements of the spatial grid structure design, a 155m-span arch truss structure containing prestressed cables was taken as an example, the design results of the direct analysis method and the effective length method were compared. The results show that after the direct analysis method is used for checking calculations and section adjustments of the members designed according to the effective length method with the stress ratio of 1.1, the structure can meet the stability requirements of the direct analysis method, and comparing with the the design result of the effective length method with the stress ratio of 1.0, the steel quantity can be optimized by 4.5%.

Keywords:direct analysis method; large span; steel structure; prestressed cable; space arch truss

作者简介：于征，博士，研究员，Email: yuzheng@ceri.com.cn。