摘要
在钢结构耐火设计中,关于轴心受压构件的高温稳定系数有不同的计算方法。本文根据4种不同长细比的轴心受压钢构件的高温试验结果,对比研究了3种不同计算方法的计算精度及实际应用性。结果表明,当构件长细比大于68时,用钢构件常温下的整体稳定系数代替构件在高温下的整体稳定系数计算轴心受压构件极限承载力的方法最简单且计算精度较高,具有实际应用意义。对于长细比较小的构件(<68),取φT=φ则偏大,在实际应用中需要修正。研究结论简化了钢结构耐火设计流程,有效提高了工作效率。
In the fire resistance design of steel structures, there are many methods to calculate the stability coefficient for axially compressed steel members. The methods are usually toilsome and not convenient. To find a simple and practical method, a comparative study of stability coefficient calculation is made on three common methods （φτ=φ,φτ=αφ,φτ=α,φ）. In order to validate the accuracy of these methods, a series of tests for axially compressed steel columns with different slenderness ratios （λ=30,49,68,84） were carried out under high temperatures. By comparing calculation results with experimental data, the results show that the method of replacing stability coefficient at normal temperature with that at high temperature is simple and practical for steel members with slenderness ratio more than 68. But the stability coefficient will be too big when the slenderness ratios of steel members are smaller than 68, in that case the stability coefficient needs to be modified in the practical applications.
出处
《建筑钢结构进展》
2011年第4期31-35,共5页
Progress in Steel Building Structures
关键词
钢构件
轴心受压构件
高温
整体稳定系数
steel member
axially compressed member
elevated temperature
stability coefficient
