FRP加固局部损伤钢压杆的稳定分析

钢结构中存在大量的轴心受力构件,作为承受永久竖向荷载的主要构件,往往是结构加固的重点.采用能量方法,分析各种杆端约束条件下,纤维增强复合材料（FRP）加固局部损伤的轴心受压钢构件在弹性失稳时的弹性屈曲临界力,并建立普遍适用的近似欧拉公式.利用ANSYS通用有限元分析软件分析FRP的厚度对损伤空心圆管临界力的影响并与该公式解析解进行对比.计算结果表明,该公式计算结果可靠,采用纤维增强复合材料加固修复局部损伤的钢结构可以有效恢复其刚度和稳定性.

STABILITY ANALYSIS OF STEEL COMPRESSION MEMBERS WITH LOCAL DAMAGE STRENGTHENED BY FRP

There are large amount of axial compressive members in steel structures and many of them need reinforcement,which carry vertical permanent load as main members. Thus, the elastic buckling load of steel compression members with local damage strengthened with FRP under axial loading was deduced using energy approach in this paper. And the approximation Euler formulas, taking account of various boundary conditions were presented. The influence of FRP thickness on critical load was discussed. And the numerical calculation results were compared with those given by ANSYS, which verified the accuracy and reliability of the method given in this paper. The steel compression members ~ stiffness and stability with local damage could be resumed and improved by strengthening with FRP.