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在不考虑剪切失效的情况下,根据弯曲极限标准推导受弯构件的耐火性能。然而,在某种情况下,火灾作用下钢梁的抗剪承载力比弯矩承载力降低得更快,从而导致钢梁发生早期失效。介绍剪力对钢梁耐火性能的影响。为了研究这种现象,使用有限元软件ANSYS建立一个可以预测钢梁火灾响应的非线性有限元模型。该模型可以预测在荷载模式、腹板长细比和耐火隔热性等不同条件下钢梁的火灾响应。使用该有限元模型评估不同几何构型钢梁的火灾响应。结果显示,在某些情况下,抗剪承载力比受弯承载力降低得更快,因此,剪切失效是这种受弯构件的主要失效模式。
The flexural behavior of the flexural members is deduced from the bending limit criteria irrespective of shear failure. However, in some cases, the shear strength of steel beams under fire is lower than the moment capacity, resulting in early failure of steel beams. Influence of shear on fire resistance of steel beam. In order to study this phenomenon, a nonlinear finite element model that can predict the fire response of steel beam is established by using finite element software ANSYS. The model can predict the fire response of steel beams under different conditions such as load mode, web slenderness and fire-resistant insulation. The finite element model was used to evaluate the fire response of steel beams with different geometric configurations. The results show that in some cases, the shear capacity decreases more rapidly than the flexural capacity. Therefore, shear failure is the main failure mode of such flexural members.