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基于一般钢截面的弹塑性非离散半解析公式,提出一个新颖的数值方法,对受约束钢梁在高温下的非线性性能进行描述。模型与较大的变形位移效应以及材料的非线性相结合,用于评估曝露在室内火荷载下钢梁的性能。在温度增加时,模型考虑了屈服和悬链线作用。公式中考虑了梁截面受各种热作用情况下沿梁长方向的热梯度影响。采用经验函数,对随着温度的变化所引起的刚度退化和屈服强度进行模拟,这种方法隶属于工程力学中传统边界值问题。研究中所提出的方法与ABAQUS有限元模拟结果吻合,所提出的计算公式优于商业有限元软件包,公式可用于结构设计和评估平台。
Based on the elasto-plastic non-discrete semi-analytical formula of general steel section, a novel numerical method is presented to describe the nonlinear behavior of the confined steel beam under high temperature. The model, combined with large deformation displacement effects and material nonlinearities, is used to evaluate the behavior of steel beams exposed to indoor fire loads. As temperature increases, the model takes into account yield and catenary effects. The equation takes into account the effect of thermal gradients along the length of the beam under various thermal effects on the beam cross-section. Empirical function is used to simulate the stiffness degeneration and yield strength caused by the change of temperature. This method belongs to the traditional boundary value problem in engineering mechanics. The proposed method is consistent with the ABAQUS finite element simulation. The proposed formula is superior to the commercial finite element software package, and the formula can be used in structural design and evaluation platform.