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目前,缺少对实际、不受控制的火灾情况下结构系统的研究。通常根据规定要求对钢结构进行防火措施。性能化标准和工具的完善要求了需要对火灾以结构部件和结构系统的影响进行研究。使用非线性材料和几何有限元分析进行参数研究,模拟高温下宽翼缘结构钢柱的响应。对3种长度柱截面不同的轴向荷载和横截面长细进行研究。对柱截面一致进行加热直至出现非弹性或弹性屈曲失效。通过限制部件(翼缘/网)的宽厚比来处理横截面的长细,所以只在部件处发生了局部屈曲。然而,部件受热时,会导致细长型部件的弹性系数和屈服强度降低。计算结果说明了不同荷载和温度条件下,网或翼缘中局部细长部分与局部和整体屈曲模式的关系。
At present, there is a lack of research on structural systems under actual and uncontrolled fire conditions. Steel structures are usually fire-proofed according to the requirements. The perfection of performance standards and tools required the need to study the effects of fire on structural components and structural systems. Parametric studies were performed using nonlinear materials and geometric finite element analysis to simulate the response of wide flange steel columns at high temperatures. The axial load and the cross section slenderness of three kinds of length columns were studied. The column section is heated consistently until non-elastic or elastic buckling fails. By dealing with the slenderness of the cross-section by limiting the aspect ratio of the part (flange / web), local buckling only occurs at the part. However, when the part is heated, it causes the elastic coefficient and the yield strength of the elongated part to decrease. The calculated results show the relationship between the local slenderness and the local and global buckling modes under different load and temperature conditions.