摘要
建立了等边角钢截面广义屈服函数的齐次化表达式,由此定义了角钢构件的单元承载比,依据承载比均匀度建立了弹性模量调整的动态阈值,并根据变形能守恒准则建立了弹性模量调整策略,提出了输电塔架极限承载力分析的弹性模量缩减法,可通过系统缩减结构中高承载比单元的弹性模量,模拟输电塔架塑性失效过程,确定结构极限承载力。该法克服了传统弹性模量缩减法及其他弹性模量调整方法因不满足比例加载条件所导致的计算精度和稳定性不良问题,并继承了该类方法原理简单、计算高效的优点。
A homogeneous generalized yield function is developed for equal angle section, based on which the element bearing ratio is defined for thin-walled angle members. The Elastic Modulus Reduced Method （EMRM） for evaluation of ultimate bearing capacity of transmission tower fabricated with angle section is presented, in which the threshold is defined based on the uniformity of element bearing ratio for reduction of elastic modulus of elements with high bearing ratio, and the elastic modulus adjustment strategy is built in terms of the principle of strain energy conservation. The plastic failure mechanism and the ultimate bearing capacity of transmission towers can be given by the proposed method. The limitations of the traditional EMRM and other elastic modulus adjustment procedures in accuracy and robustness, which are resulted from non-proportional loading, are avoided, while their advantages of simplicity and fast convergence are inherited.
出处
《工程力学》
EI
CSCD
北大核心
2013年第5期317-323,共7页
Engineering Mechanics
基金
国家自然科学基金项目(51168003
51169003)
广西自治区主席基金项目(2010GXNSFD169008)
关键词
输电塔架
广义屈服函数
齐次化
极限承载力
弹性模量缩减法
transmission tower
generalized yield function
homogeneous
ultimate bearing capacity
elasticmodulus reduction method
