摘要
本文对不同长细比、宽厚比的七组Q420高强角钢柱进行了轴心受压试验研究,分析了高强等边角钢轴心受压构件的整体稳定性能和极限承载力。考虑了构件的材性参数、初始缺陷、残余应力等因素,依靠ANSYS有限元软件平台对Q420高强等边角钢轴心受压构件的稳定承载力进行了数值模拟计算,通过变化参数研究了宽厚比、残余应力、初弯曲等因素对高强角钢构件稳定承载性能的影响。
依据相关规范计算了Q420高强等边角钢受压构件的整体稳定承载力,并与本文试验结果进行对比分析,发现《钢结构设计规范》(GB50017-2003)的计算结果低于试验值,说明规范公式偏于保守;而由美国规范ASCE10-97计算的极限承载力与试验结果较为接近,建议作为计算参考。
基于建立的数值计算模型,根据数值计算结果,拟合出一条适用于Q420高强角钢构件的φ-λ柱子曲线和公式,并经试验结果验证了拟合公式的可靠性,可供工程实际参考。
An axial compression experiment about seven groups of Q420 high strength steel equal single angle columns with different width/thickness ratio and slenderness ratio was carried out in this paper,and the overall stability and ultimate bearing capacity of Q420 high strength steel column was researched as well. An finite element model(FEM)was also built by using ANSYS software. It turns out the results of the numerical model which considered residual stress and geometric imperfections. The stability capacity of high strength steel member was researched by changing the parameters, such as width/thickness ratio, residual stress and geometric imperfections.
The overall stability load of Q420 high strength steel compression members was calculated with the relevant specifications and codes. Comparison with test results, there is a discrepancy between the stability capacity results of test and calculated by Chinese GB50017-2003, the computing formula in this code is very conservative. But the result of ASCE10-97 is relatively closer with test, which can be referred in the actual engineering computation.
Based on the FEM, the calculated numerical results can be used in fitting the curve ofφ-λand formula, and it is hoped that the formula may provide some reference for practial engineering.
引文
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