空间钢框架修正精细塑性铰法理论研究  

Study on the modified plastic hinge analysis of spatial steel frames

作　　者：张俊峰[1] 郝际平[2] 钟炜辉[2] 

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2010年第4期509-513,520,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50378078)

摘　　要：建立了考虑剪切变形及二阶效应影响的空间梁柱单元,可考虑截面的逐渐屈服,以及残余应力引起的分布塑性对单元刚度的影响.单元刚度矩阵包含了轴向、弯曲和扭转位移之间的耦合效应、弯扭屈曲以及结构变形过程中由于力矩空间转动引起的连带弯矩影响.采用C++编制了高等分析程序,通过几何、材料非线性算例证明了本文研究方法的精确度和有效性.The formulation of a spatial beam-column element with shear deformation and second-order effects is presented. Material nonlinearity is modeled,which can account for the gradual yielding of the section and the reduction of the element stiffness due to distributed plasticity resulting from residual stresses. The coupling terms between the axial,lateral and torsional displacements and lateral torsional buckling effect are included in element stiffness matrix. The induced moments generated by rotation of the initial moment about the other axes in the deformation of the structure is considered. Using C＋＋ language,spatial steel frames advanced analysis program is complied. Numerical examples including both geometric and material nonlinearities are used to demonstrate the accuracy and efficiency of the proposed analytical method and computer program.

关 键 词：空间钢框架 精细塑性铰法 几何刚度矩阵 剪切变形 弯扭屈曲 

分 类 号：TU973.251[建筑科学—结构工程]