【摘要】 本文推导了材料为理想弹塑性的空间梁单元弹塑性刚度矩阵的显式形式。所采用的广义屈服函数中考虑了轴力、弯矩、剪力、扭矩的交互作用。利用综合刚度法对处在过渡状态的单元刚度进行修正。从而避免了对时间步长的精确细分。最后对一实际的北海独腿平台进行了强震作用下弹塑性响应分析。更多还原

【Abstract】 An explicit expression of stiffness matrix for a 3-dimensional beam made of e-lastic-plastic material is derived in the paper. Interactions among Oxial force, fending moment and shearing force are considered in the generalized yield function. The stiffness of the elements in transition state is modified by the synthetical stiffness method and the calculation can thus be relieved from the precise division of the time steps.In the final part of the paper, the elastic-plastic response analysis of a monopod platform used in the North sea subjected to a strong earthquake is described for illustration更多还原