冷弯薄壁型钢四肢拼合立柱轴压承载力设计方法

聂少锋; 周天华; 杨东华; 张亚江

doi:10.11835/j.issn.1674-4764.2011.04.005

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冷弯薄壁型钢四肢拼合立柱轴压承载力设计方法

更新时间：2023-11-28

- 冷弯薄壁型钢四肢拼合立柱轴压承载力设计方法
- Axial Bearing Capacity Design Method of Cold-Formed Steel Quadruple-C Built-up Section Members
- 土木与环境工程学报（中英文） 2011年33卷第4期页码：20-28
- 作者机构：
  
  1. 长安大学建筑工程学院,西安,710061
  2. 西部机场集团,西安,710075
- 作者简介：
- 基金信息：
  
  陕西省自然科学基金项目资助（SJ08E211）
- DOI：10.11835/j.issn.1674-4764.2011.04.005
  中图分类号：
- 纸质出版：2011
- 稿件说明：
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聂少锋, 周天华, 杨东华, 等. 冷弯薄壁型钢四肢拼合立柱轴压承载力设计方法[J]. 土木与环境工程学报（中英文）, 2011,33(4):20-28.

NIE Shao-feng, ZHOU Tian-hua, YANG Dong-hua, et al. Axial Bearing Capacity Design Method of Cold-Formed Steel Quadruple-C Built-up Section Members[J]. Journal of Civil and Environmental Engineering, 2011, 33(4): 20-28.
聂少锋, 周天华, 杨东华, 等. 冷弯薄壁型钢四肢拼合立柱轴压承载力设计方法[J]. 土木与环境工程学报（中英文）, 2011,33(4):20-28. DOI： 10.11835/j.issn.1674-4764.2011.04.005.

NIE Shao-feng, ZHOU Tian-hua, YANG Dong-hua, et al. Axial Bearing Capacity Design Method of Cold-Formed Steel Quadruple-C Built-up Section Members[J]. Journal of Civil and Environmental Engineering, 2011, 33(4): 20-28. DOI： 10.11835/j.issn.1674-4764.2011.04.005.

摘要

建立了考虑材料、几何和接触非线性的有限元模型

在对冷弯薄壁型钢四肢拼合截面立柱的轴压性能试验试件进行模拟分析

验证有限元方法正确性的基础上

对考虑长细比、截面翼缘宽厚比等因素的一系列试件进行了数值分析

并得到其轴压承载力。在相关规范“有效宽度法”和“直接强度法”的基础上

提出了冷弯薄壁型钢四肢拼合截面立柱轴压承载力的设计方法：有效计算长度法和修正系数法。研究结果表明：试件最终破坏均呈现局部屈曲和畸变屈曲的破坏模式；在未考虑计算长度系数折减的情况下

当长细比小于50时

各规范公式计算值均略低于试验值和有限元值

吻合较好

当长细比大于50时

公式计算结果过于保守。

Abstract

The finite element model involving geometric large deformation

materials and contact nonlinearity is established.Specimens of cold-formed steel quadruple-C built-up section members are simulated and the finite element models are proved to be valid.Then

numerical analysis on the behavior of specimens with different slenderness ratio and flange flakiness ratio are carried out

and then the axial bearing capacities of specimens are obtained.Based on effective width method and direct strength method (DSM) in related codes

two design methods of cold-formed steel quadruple-C built-up section members under axial compression are proposed:effective length method and correction factor method.It is shown that:the final failure characteristics of all specimens are local buckling and distortional buckling.In the case of not considering the reduction of effective length

the results calculated by each code are slightly lower than those of test and FEM when the slenderness ratio is less than 50

while the results are too conservative when the slenderness ratio is more than 50.

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