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采用塑性延伸方法对空间桁架进行非弹性大变形分析。给出描述轴力和双轴弯矩作用下宽翼缘横截面型钢表面塑性强度的精确公式。此外,采用经验公式来对合力作用下横截面的切线模量进行预测。可采用切线模量计算公式来评估用于内力重分布的割线刚度。该公式由欧洲钢结构协会(ECCS)推荐使用,适用于考虑残余应力的型钢。使用该公式,利用基于刚度矩阵法的有限元程序,预测空间框架的非弹性大变形特性。有限元模型的分析结果与之前的纤维模型分析结果相符。分析结果表明,新模型是准确有效的。
The non-elastic deformation analysis of space truss is performed by plastic extension method. The exact formula describing the plasticity of the surface of wide flange section steel with axial force and biaxial bending moment is given. In addition, the empirical formula is used to predict the tangent modulus of the cross-section under synergy. The tangent modulus calculation formula can be used to evaluate the secant stiffness for internal force redistribution. This formula is recommended by the European Association of Steel Structures (ECCS) and is suitable for use in bars with residual stresses. Using this formula, the finite element program based on the stiffness matrix method is used to predict the large inelastic deformation of the space frame. Finite element model analysis results are consistent with the previous fiber model analysis. The results show that the new model is accurate and effective.