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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。
The homogeneous expression of the generalized yield function of the equilateral angle section is established. The unit bearing ratio of the angle member is defined, and the dynamic threshold of elastic modulus adjustment is established according to the bearing ratio evenness. Based on the conservation criterion of deformation energy, Elastic modulus adjustment strategy, the elastic modulus reduction method for the analysis of ultimate bearing capacity of transmission tower is proposed. The ultimate bearing capacity of the structure can be determined by reducing the elastic modulus of the unit with high bearing ratio in the system and simulating the plastic failure process of the transmission tower. This method overcomes the problems of poor accuracy and stability caused by the traditional method of elastic modulus reduction and other methods of elastic modulus adjustment, which are not satisfied with the proportional loading conditions and inherits the advantages of simple method and high efficiency of such methods.