交错桁架结构体系的空间二阶弹塑性全过程分析  

A NONLINEAR ANALYSIS APPROACH FOR STAGGERED-TRUSS STRUCTURE SYSTEMS OF THREE-DIMENSIONAL ELASTO-PLASTICITY

作　　者：周绪红[1] 莫涛[2] 

机构地区：[1]长安大学 [2]湖南大学

出　　处：《土木工程学报》2005年第5期10-14,共5页China Civil Engineering Journal

基　　金：建设部十五科技攻关与重点推广项目(建科[200]号);国家自然科学基金(50078021);高校博士点基金(2000053203);湖南省自然科学基金(OIJJY1006)

摘　　要：本文基于非线性连续介质力学理论和内力屈服面塑性流动理论,推导出计算交错桁架结构体系极限承载力的二阶弹塑性刚度方程。该方法在刚度方程的构造中考虑了单元轴力、剪力、弯矩、扭矩以及结构剪切变形的影响,并在塑性铰处考虑了内力之间的相互影响。算例分析表明本文方法具有良好的计算精度。Based on nonlinear continuum mechanics and stress-resultant yield surface plastic flow rule, a new type of elasto-plastic stiffness matrix is presented,which can be employed to calculate the ultimate bearing capacity of staggered-truss systems.In this approach, not only the effect of axial force,shear force, bending moment,torsion and structural shear deformation,but also the interaction between internal forces of the plastic hinge are considered.Numerical solutions indicate that this method is highly accurate.

关 键 词：交错桁架 二阶弹塑性 极限承载力 

分 类 号：TU311.2[建筑科学—结构工程]