基于OpenSees的高阶非线性桁架单元开发及应用

• 作 者: 张俊峰 高健利
• 机 构: 郑州大学土木工程学院,
• 出 处: 郑州大学学报(工学版)
• 发表日期: 2016年06期
• 关键词: 空间桁架 几何非线性 高阶刚度矩阵 OPENSEES 二次开发 space truss geometric nonlinear higher order s

对于大跨度的空间桁架结构,准确模拟非线性状态后的力学行为非常重要.基于UL法的增量微分方程,详细推导了空间桁架单元考虑几何非线性的高阶刚度矩阵,通过OpenSees开放平台,开发了高阶非线性桁架单元,给出了单元的实现方式、静力和动力计算的TCL命令流程和迭代过程的非线性算法,通过几种桁架结构的非线性静力和地震作用下的非线性动力对比分析,表明采用本文方法实现的单元能够准确模拟桁架结构的强非线性性能.

For large-span space truss structure, it is very important to accurately simulate the behavior of the nonlinear state. Based on the incremental differential equation of the UL method, the high-order stiffness matrix considering the geometric nonlinearity of the space truss element is deduced in detail. Through the OpenSees open platform, The high-order nonlinear truss elements are developed. The implementation of elements, the TCL command flow of static and dynamic calculations and the nonlinear algorithm of iterative process are given. By means of nonlinear static and seismic effects of several truss structures, Linear dynamic contrast analysis shows that the unit realized by this method can accurately simulate the strong nonlinearity of truss structure.