桁架结构优化设计的满应力法仿真研究

摘要

The application of full stress method to the problem of optimization of truss was researched in this pa per. The full stress method is usually difficult to convergence when the constraints of stress, displacement and stabili ty are considered in the same problem. It influences the effect of practice application. For solving the problem, a method for setting the coefficient of relaxation in full stress optimum was proposed. The coefficient of relaxation was divided to two parts for full stress step and full displacement step in full stress method to make it easier convergence. The example shows that the proposed setting method can get good convergence in full stress optimum for truss with sta bility even though it can not get ideal result with conventional setting method.%研究应用计算机进行桁架结构优化设计中满应力齿行法的应用问题.目前满应力齿行法在同时考虑应力、位移以及压杆稳定性约束时,计算结果往往存在难以收敛的缺陷,导致方法在实际应用中效果不佳.为解决以上问题,提出从算法中的松弛系数设置入手,将满应力步和满位移步的松弛系数分开设置,通过合理设置该参数使得计算能较好地收敛,经实验证明:当考虑压杆稳定时,传统的松弛系数设置方法难以得到理想效果,而本文提出的设置方法能避免计算过程中的振荡现象,能得到较好效果.