RENEWAL METHOD OF CABLE STIFFNESS FOR INITIAL SHAPE ANALYSIS OF STRING BEAMS
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摘要: 由于张弦梁结构的几何非线性特点,施加预应力后的工作状态与构件放样尺寸有较大的差别,应用有限元法,在从工作状态迭代到零应力状态的过程中不断更新索单元的刚度矩阵,以便于引入预应力,并将形态分析与荷载分析统一。典型算例的分析表明,该方法计算简便,精度较高。Abstract: There will be a greater difference between the working state after applying prestress and the set-out size of the members for a string beam structure due to its nonlinear characteristics.Using FEM the stiffness matrix of a cable element is replaced continuously during the process to zero-stress state from the working state in order to lead in prestress, so as to unify the shape and load analyses.The analy sis of a typical example shows that the method features a simple calculation and a higher precision.
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Key words:
- string beam /
- cable /
- cable stiffness
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