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提出了一种基于直接强度法(DSM)的整体屈曲曲线,用于计算均匀温度场和非均匀温度场下薄壁钢构件的整体屈曲极限强度的计算方法。将基于DSM曲线法得到的结果与有限元软件ABAQUS的数值结果对比。对一个由不同槽钢开口相对组成的构件进行了一系列环境温度和抗火试验,得出了它们在不同温度下的承载力和不同荷载下的抗火性能,并据此建立了数值模型。由此数值模型用于计算不同边界条件、荷载级别和截面尺寸的均匀温度场和不均匀温度场下薄壁构件的承载力。DSM整体屈曲曲线可以直接应用于均匀温度场,若应用于非均匀温度场需要进行小的修改。
An integral buckling curve based on direct strength method (DSM) is proposed to calculate the total buckling strength of thin-walled steel members under uniform and non-uniform temperature fields. The results based on the DSM curve method are compared with the numerical results of the finite element software ABAQUS. A series of relative temperature and fire resistance tests were carried out on a component with opposite openings of different channels. Their bearing capacity under different temperatures and the fire resistance under different loads were obtained. Based on this, a numerical model was established. Therefore, the numerical model is used to calculate the bearing capacity of thin-walled members under uniform temperature field and non-uniform temperature field with different boundary conditions, load levels and cross-sectional dimensions. The overall buckling curve of the DSM can be directly applied to a uniform temperature field, requiring minor modifications if applied to a non-uniform temperature field.