论文部分内容阅读
为分析空间桁架结构的非线性静力性能,在向量式结构力学计算方法中,采用斜坡加载法进行荷载的施加,并对结构施加较大的虚拟阻尼,使结构在荷载作用时间内始终处于静力平衡状态.对荷载作用下每个空间点的振动进行简化,得到空间点近似的振动周期,采用五个时间点对最小的振动周期进行描述,得到用于空间桁架结构静力分析的临界时间步长.以一星形空间桁架为例,考虑结构的几何非线性和材料非线性,对桁架进行静力分析,并将计算结果与ANSYS计算结果进行对比;对临界时间步长计算方法进行验证.结果表明,采用本文方法对空间桁架结构进行非线性静力分析具有很高的精确性,计算步骤简明而系统化;采用临界步长的确定方法得到的临界时间步长与实际步长相吻合.
In order to analyze the nonlinear static performance of the space truss structure, in the method of vectorial structural mechanics calculation, the slope load method is adopted to apply the load and the structure is given a large virtual damping so that the structure is always in static Force equilibrium state of the space truss structure, the vibration of each space point under load is simplified, the approximate vibration period of the space point is obtained, the minimum vibration period is described by five time points, and the critical time for static analysis of the space truss structure is obtained Step length. Taking a star-shaped space truss as an example, considering the geometric nonlinearity and material nonlinearity of the structure, the truss is statically analyzed and compared with the ANSYS calculation results. The critical time step calculation method is verified The results show that the nonlinear static analysis of space truss structure using this method has high accuracy and the calculation steps are concise and systematic. The critical time step obtained by the method of critical step length coincides with the actual step size.