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采用向量式有限元分析,对受火钢结构的非线性响应进行研究。通过与已公布的钢结构试验数据及分析结果相比较,验证数字模型。对Williamstoggle框架和钢框架在地震荷载和火荷载下的非线性性能响应进行研究。数值结果显示:当温度低于临界值时,随着温度增加,Williamstoggle框架的承载力显著增大;然而,当温度高于临界值时,随着温度增加,Williamstoggle框架的承载力显著减少,但当温度达到1000℃时,承载力仍大于室内温度时的弹性屈服强度。此外,随着温度增加,屈服前浅拱向上偏转,而且其挠度远小于同样跨度的梁结构。屈曲后,结构的挠度向下,当重新平衡时,显示出悬链线作用。在地震诱发的火灾中,结构变形受余震、火、结构单元的破坏影响较大。
The vectorial FEA is used to study the nonlinear response of fire-affected steel structure. The digital model was validated by comparison with the published steel structure test data and analysis results. The nonlinear response of the Williamstoggle frame and the steel frame under earthquake load and fire load was studied. The numerical results show that the bearing capacity of the Williamstoggle frame increases significantly with increasing temperature when the temperature is below the critical value. However, the bearing capacity of the Williamstoggle frame decreases significantly with increasing temperature when the temperature is above the critical value When the temperature reaches 1000 ℃, the bearing capacity is still greater than the indoor temperature when the elastic yield strength. In addition, as temperature increases, shallow arches tend to deflect upward before yielding, and their deflections are much smaller than beam structures of the same span. After buckling, the deflection of the structure is downward, showing a catenary effect when rebalancing. In earthquake-induced fires, the structural deformation is greatly affected by the aftershocks, fires and structural elements.