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通常在钢结构弹塑性设计中会假设大多数受压横截面中具有“全塑性铰”。基于平衡条件提出的用于计算塑性极限状态下结构内力的公式,不能计算出这种极限状态下各种内力组合下结构的整体变形。针对矩形管截面和双轴对称I形截面的弹塑性分析提出一个简单模型。该模型考虑了横截面塑性应变极限状态下的结构整体变形(轴向变形和弯曲曲率)与相应内力(轴力和弯矩)的关系。利用这个模型可以对横截面延性进行真实的评估。
It is common to assume in steel elasto-plastic designs that most compression cross-sections have a “plastic hinge.” Based on the formula for calculating the internal force of structure under the plastic limit condition, the overall deformation of the structure under various internal force combinations can not be calculated based on the equilibrium condition. A simple model is proposed for the elasto-plastic analysis of rectangular tube cross section and biaxial symmetrical I-section. The model takes into account the relationship between the overall structural deformation (axial deformation and bending curvature) and the corresponding internal forces (axial forces and bending moments) under the plastic strain limit of the cross-section. Use this model to make a real assessment of cross-section ductility.