摘要
全方位长短腿输电塔已广泛应用于山区输电工程,但组合计算耗时过长始终是精确优化分析的最大障碍。考虑到不同长短腿组合模型结构上的相似性,提出将一种改进的子结构法引入内力计算过程。输电塔被分为子结构和腿部结构2部分,通过分块分解法计算等效刚度矩阵和荷载列阵,从而完成自由度凝聚和边界节点的处理,去除了绝大部分自由度组装和分解的时间,提高了计算效率。结合耗时分析,进一步提出了减少工况数目的方法。
All-direction unequal legs transmission tower are widely applied on the transmission projects in mountainous areas while long time-consuming of composition calculation is always the greatest obstacle to accurate optimal analysis.An improved substructure method is introduced in the calculation prcocess of internal force due to comparability of different assembled models for unequal legs.The transmission tower is divided into two parts including the substructure and the leg stucture.The block decomposition algorithm is used in the calculation of equivalent stiffness matrix and load matrix.As a result,the DOF condensation and border nodal treatment are accomplished,so that the time is saved for most of composition and decomposition of DOF and the calculative efficiency enhanced.Furthermore,an idea is put forward for reducing the calculation capacity by combining with time consuming analysis.
出处
《电力建设》
2012年第1期50-53,共4页
Electric Power Construction
关键词
输电塔
全方位长短腿
子结构法
有限元
transmission tower
all-direction unequal legs
substructure method
finite element method
