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给出了等参样条有限条法(ISFSM)用于分析开孔薄壁钢结构的材料非弹性和几何非线性的研究进展。简要介绍了ISFSM理论。提出了运动学方程、应力-位移关系和假定的本构关系。通过增量平衡条件,推导出正切刚度矩阵。讨论了板带连续和边界条件的要求。特别强调了塑性理论和求解速率方程的方法,以及相关的欧拉后退法和材料模量一致的假定。开孔薄壁钢结构的非弹性后屈曲性能分析的准确性和有效性,证实了目前的等参样条有限条法的有效性。
The research progress of ISFSM for analyzing the material inelasticity and geometric nonlinearity of thin-walled open-ended steel structures is presented. Briefly introduced the ISFSM theory. Kinematics equations, stress-displacement relationships and assumed constitutive relations are proposed. By incremental equilibrium conditions, the tangent stiffness matrix is derived. The requirements for slab continuity and boundary conditions are discussed. Particular emphasis is placed on the plasticity theory and the method for solving the rate equation, and on the assumption that the associated Euler back-off method is consistent with the material modulus. The accuracy and validity of the analysis of the inelastic post-buckling performance of open-walled thin-walled steel structures confirm the validity of the current finite strip method for isoparametric splines.