Flexural buckling and post-buckling analysis of tapered columns in transient fire
Flexural buckling and post-buckling analysis of tapered columns in transient fire
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DOI：
10.1016/j.apm.2023.07.006
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发表时间：
2023
影响因子：
5
通讯作者：
Yongan Ren;R. Huo;Zhangjian Wu;L. Cunningham;D. Zhou
中科院分区：
文献类型：
--
作者：
Yongan Ren;R. Huo;Zhangjian Wu;L. Cunningham;D. Zhou
本文研究了温度沿沿着方向不均匀的变截面柱在瞬态火灾作用下的时变弯曲屈曲和后屈曲响应。首先，通过求解考虑对流-辐射边界条件和温度相关（TD）材料特性的降维瞬态传热问题来确定柱内的瞬态温度场。随后，应用von Kármán几何非线性理论，得到了非线性平衡方程。采用微分求积法求解非线性传热方程和平衡方程。根据屈服准则，预测材料发生破坏的极限载荷。讨论了局部火灾对变截面钢管柱温度、屈曲和屈曲后响应的影响。
This paper presents time-varying flexural buckling and post-buckling responses of tapered columns under a transient fire of which the temperature is non-uniform along the length. First, the transient temperature field within the column is determined by solving a dimensionally reduced transient heat transfer problem considering the convection-radiation boundary conditions and temperature-dependent (TD) material properties. Subsequently, the von Kármán geometric nonlinear theory is applied to obtain the nonlinear equilibrium equation. The nonlinear heat transfer and equilibrium equations are solved by the differential quadrature (DQ) method. According to a yield criterion, the ultimate load at which the material failure occurs is predicted. The influences of a transient localised fire on the temperatures, buckling and post-buckling responses of tapered steel tubular columns are discussed.