弹性钢构件火灾下的二阶分析

Second order analysis for elastic steel beam column under fire condition

基于小挠度理论和大挠度理论的基本微分方程,利用虚拟载荷法分别建立了弹性钢构件(梁、柱)在火灾条件下的二阶分析格式。计算时该格式使用同一刚度矩阵,只需要不断更新荷载矢量,即在荷载矢量的迭代中反映几何非线性效应。计算结果与试验对比分析表明,该方法计算简捷、精度高。

Based on the differential equation of large deform theory and small deform theory, respectively, this paper establishes the second order analysis styles of elastic steel beam column under the fire condition, which are based on the subjunctive load method. In calculation, this method uses the same stiff matrix, and only to renew the load vectors, which means it will reflect the geometric nonlinear effect in the load vectors＇ iteration. Compare to the experiment, the result of numeration shows this method is simple and direct, and high precision.