基于空间等效桁架单元方法的钢筋混凝土结构非线性分析  

Nonlinear Analysis of RC Structure Based on Space Equivalent Truss Element Method

作　　者：吴方伯[1] 熊江陵[1] 李钧[1] 岳建武 周绪红[1,3] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]中航建筑工程有限公司,湖南长沙410004 [3]重庆大学土木工程学院,重庆400044

出　　处：《建筑科学与工程学报》2015年第3期1-6,共6页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51278179);长沙市科技计划重点项目(K1205229-11)

摘　　要：针对传统有限元分析的复杂性以及裂缝描述不准确等缺点,从空间应力单元出发,结合平面等效桁架单元的研究方法,提出了一种空间等效桁架单元;基于空间等效桁架单元和空间应力单元刚度等效的原则,推导了等效后的单元刚度矩阵、杆件截面面积和杆件轴力计算公式,探讨了空间等效桁架单元应用于钢筋混凝土结构非线性分析的相关问题;借助ANSYS 10.0采用该方法对一桥墩结构进行计算分析,并与采用平面等效桁架单元方法和试验方法所得结果进行了对比。结果表明:采用该方法对钢筋混凝土结构进行分析能够满足工程精度要求,并且能够准确描述裂缝的开展。In order to deal with complexity of traditional finite element analysis and inaccurate description of cracks,a kind of space equivalent truss element was proposed based on space stress element and plane equivalent truss element method.Based on the principles of stiffness equivalence for space equivalent truss element and space stress element,the equivalent element stiffness matrix,the equivalent sectional area of member bar and the calculation formula of axial force were derived.The problems related to space equivalent truss element used in nonlinear analysis of reinforced concrete（RC）structure were discussed.A bridge pier structure was analyzed by space equivalent truss element with ANSYS 10.0,and the analysis results were compared with the results of plane equivalent truss element and test.The results show that the proposed method is feasible to analyze RC structure,and can satisfy the requirements of engineering precision and accurately describe the crack development.

关 键 词：空间等效桁架单元 有限元法 刚度等效 钢筋混凝土结构 非线性分析 

分 类 号：TU311.41[建筑科学—结构工程]