（1 重庆大学土木工程学院, 重庆 400045； 2 同济大学土木工程防灾国家重点实验室, 上海 200092）

［摘要］为了研究高温下轴心受压钢构件的局部稳定设计方法，分析了现行《钢结构设计规范》（GB 50017—2003）中给出的宽厚比(高厚比)验算方法，并对该方法中的弹性模量修正系数进行了改进。采用改进后的方法考虑了温度对钢材力学性能的影响，给出了高温下轴心受压钢构件宽厚比(高厚比)的验算方法，利用有限元软件ANSYS，结合试验结果对给出的验算方法进行了验证。研究表明：对弹性模量修正系数进行改进后，计算结果更可靠；采用《建筑钢结构防火技术规范》(CECS 200:2006)中的钢材高温力学性能指标计算出的高温下轴心受压钢结构的宽厚比(高厚比)限值与常温下的区别不大，该值可以采用一个与温度有关的系数来确定。

［关键词］局部稳定; 宽厚比; 温度; 轴心受压; 钢结构

中图分类号：TU392       文献标识码：A       文章编号：1002-848X(2014)09-0048-05

Local stability study of steel members under axial compression at room and elevated temperature

Wang Weiyong1, Li Guoqiang2, Huang Jie1

 (1 School of Civil Engineering, Chongqing University, Chongqing 400045, China; 2 State Key Lab for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)

Abstract: In order to investigate the design approach of local stability of steel members under axial compression at elevated temperature, the check method proposed in current Design code for steel structures (GB 50017—2003) was analyzed and modification was made on the correction coefficient of elastic modulus. By adopting the modified method, influence of the high temperature on steel mechanical was presented and check method on width（height）-to-thickness ratio at high temperature was presented. FEM software ANSYS was used to verify the check methods in combination with experimental results. Results show that with improved correction coefficient of elastic modulus, the results are more reliable. The limit values of width(height)-to-thickness ratio for axial compressed steel members have little difference between room and elevated temperatures by employing the high temperature material mechanical properties presented in Code for fire safety of steel building structures (CECS 200:2006), and the limit value at elevated temperature can be determined by employing a coefficient related with temperature.

Keywords: local stability; width-to-thickness ratio; temperature; axial compression; steel structure

*中国博士后基金（20110490811，2012T50765），重庆市首批青年骨干教师资助计划资助。

作者简介：王卫永，博士，副教授，Email：wywang@cqu.edu.cn。

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