多处局部损伤钢压杆经纤维复合材料加固后的抗屈曲性能  

INVESTIGATION ON THE ANTI-BUCKLING BEHAVIOR OF STEEL COMPRESSION MEMBERS WITH MULTIPLE LOCAL DAMAGE BY FRP STRENGTHENING

作　　者：李斌[1,2] 李传习[2] 

机构地区：[1]湖南理工学院土木建筑工程学院,湖南岳阳414000 [2]长沙理工大学土木与建筑学院,长沙410076

出　　处：《工业建筑》2017年第1期168-173,共6页Industrial Construction

基　　金：国家自然科学基金项目(51378080);科技部973项目(2015CB057701);湖南省教育厅科研项目(15C0623);湖南省大学生研究性学习项目(湘教通[2015]269号)

摘　　要：为解决具有多处局部损伤的钢压杆经纤维复合材料FRP加固后屈曲临界力的计算缺乏实用方法的问题,采用能量方法,推导FRP加固多处局部损伤钢压杆的屈曲临界力,建立了适用于各种杆端约束条件的准欧拉公式。在此基础上,提出了FRP抗屈曲加固多处局部损伤钢压杆的设计方法。利用ANSYS有限元软件验证了准欧拉公式的正确性与可靠性,对影响多处局部损伤空心圆管抗屈曲性能的主要参数,如FRP的厚度、边界条件及加固材料弹性模量等进行计算与分析,得到了它们的影响规律。以一根多处翼缘板局部损伤的H型钢支柱为例设计FRP加固方案,并进行稳定计算与分析。结果表明:按照所提出的加固方案实施加固,试件等效稳定系数均有所提高,能够恰好恢复或适当增强损伤构件的抗屈曲性能。The practical method of analysing anti-buckling behavior of steel compression members with multiple local damage by FRP strengthening is lacking. To solve this problem, the elastic buckling load of steel compression members with multiple local damage strengthened with FRP under axial loading was deduced using energy approach. And the approximation Euler formula, in which various boundary conditions were considered presented. Then, an effective design method for steel compression members with multiple local damage by FRP strengthening was proposed. The influencing rule of FRP thickness, boundary conditions and elastic modulus of reinforcement materials on stability of hollow pipe with local damage by FRP strengthening was obtained. The calculation results of hollow pipe＇s critical load were compared with those given by ANSYS, which verifies the accuracy and reliability of the method given in this paper. Finally, some reinforced designs for a H-shaped steel shore with multiple local damage at flanges were evaluated and some calculating results were given. Analysis showed that the steel compression members＇ stability coefficient, stiffness and stability could be resumed and improved using the design method.

关 键 词：纤维增强复合材料(FRP) 抗屈曲加固 多处局部损伤 准欧拉公式 加固设计方法 

分 类 号：TU391[建筑科学—结构工程]