考虑初始缺陷的碳纤维增强压弯钢构件稳定问题研究  

A STUDY ON STABILITY OF STEEL MEMBER WITH INITIAL IMPERFECTION WRAPPED BY CARBON FIBER

作　　者：钮鹏[1,2] 金春福[3] 杨刚[4] 张迪[1] 

机构地区：[1]沈阳大学建筑工程学院,辽宁沈阳110044 [2]沈阳大学辽宁省环境岩土工程重点实验室,辽宁沈阳110044 [3]辽宁省交通高等专科学校公路工程质量检测中心,辽宁沈阳110122 [4]大连海事大学道路与桥梁工程研究所,辽宁大连116026

出　　处：《工程力学》2013年第B06期195-199,共5页Engineering Mechanics

基　　金：国家科技支撑计划项目(2011BAJ06B04);沈阳大学辽宁省环境岩土工程重点实验室开放基金项目(201243)

摘　　要：该文推导了在轴压和弯矩共同作用下具有初始几何缺陷且拉压侧外表面粘贴碳纤维片后的H形截面构件绕强轴失稳时极限荷载的计算公式。通过采用弹塑性有限元法,结合非线性屈曲理论,进行了受初始几何缺陷影响的碳纤维增强钢构件在压弯荷载共同作用下的屈曲分析,并得到极限承载力的数值解。将有限元结果与Je ek法得到的解析解进行比较,可以发现两种结果吻合较好。计算结果表明,当构件两端给定的弯矩超过某一数值后,具有缺陷的碳纤维增强H型钢构件的极限承载力高于完善的H型裸钢构件的极限承载力,表明了碳纤维作为增强材料的有效性和可用性。Considering the initial imperfection, the analytical expressions of calculating the ultimate load of buckling about the neutral axis with the maximum moment of inertia for an H-shaped member with flange outsides wrapped by carbon fiber are derived. Using the elastic-plastic finite element method and the theory of nonlinear buckling, the impact by initial geometric imperfections on an H-shaped steel member wrapped by carbon fiber under axial compressive load and bending moment are analyzed and the numerical solutions of ultimate bearing capacity are obtained. By the comparison with the values of the finite element method （FEM）, it shows that the analytical method proposed is valid. When the given moment is more than a certain value, the ultimate bearing capacity of the steel member wrapped by carbon fiber is higher than that of the H-shaped perfection bare steel member. It is taken to illustrate that it is the effectiveness and availability to carbon fiber as reinforcement material.

关 键 词：结构工程 钢结构 弹塑性稳定 初始缺陷 Jeek法 

分 类 号：O344.7[理学—固体力学] TU391[理学—力学]