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提出空间计算模型。引入偏心空间薄壁梁单元及空间组合索单元,导出弹性刚度阵、几何刚度阵、质量阵。拉索张力随垂度变化的非线性由等效几何刚度计入。考虑梁、塔弯曲、轴向变形相互作用的非线性。修正迭代法解非线性静力方程。动力分析考虑轴力影响,采用一致质量阵计算平面和空间体系的自振特性,以提供临界风速数据。动态响应(车振、地震)采用线性化的振型迭加法考虑动态非线性,以便在中小型计算机上实现计算。
Propose a space calculation model. The eccentric space thin-walled beam element and space combination cable element are introduced to derive elastic stiffness matrix, geometric stiffness matrix and mass matrix. The nonlinearity of the cable tension with dip changes is taken into account by the equivalent geometric stiffness. Consider the nonlinearity of beam-tower bending and axial deformation interaction. Modified iterative method to solve nonlinear static equations. Dynamic Analysis Considering the influence of axial forces, a uniform mass matrix is used to calculate the natural vibration characteristics of the plane and space systems to provide critical wind speed data. Dynamic Response (Vehicle Vibration, Earthquake) The linearized modal superposition method is used to consider the dynamic nonlinearity so as to realize the calculation on small and medium-sized computers.