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研究高温下方形钢管轴心受压柱的稳定性。目前,欧洲规范中已包括检测火灾下柱屈曲承载力的设计模型。由于受复杂的非线性性能影响,标准的设计模型并不完全合适,且在特殊情况下,根据常用设计公式来预测的柱的屈曲承载力的结果甚至并不安全。主要研究分析模型和改进的数值法。因此,使用非线性有限元法来进行更广泛的数值研究。根据改进的、高温下柱性能的计算模型得出的结果提出一个分析模型并进行验证。所提出的模型包含了各种对火灾下轴心受压柱屈曲承载力的非线性刚度特性。此模型的优点是便于在常用的设计方法中使用。
The stability of the square column under axial compression was studied. At present, the European Code has included the design model for testing the buckling capacity of columns under fire. Due to the complex nonlinear behavior, the standard design model is not entirely suitable, and in exceptional cases, the results of column buckling capacity predicted by common design formulas are not even safe. The main research and analysis model and improved numerical method. Therefore, the nonlinear finite element method is used to conduct a more extensive numerical study. An analytical model was proposed and validated based on the results obtained from the improved, high-temperature calculation model for column performance. The proposed model includes a variety of nonlinear stiffness characteristics of the buckling capacity of axially loaded columns under fire. The advantage of this model is that it is easy to use in common design methods.