Ultimate capacity of uniaxially compressed perforated steel plates strengthened by using CFRPs

摘要

The aim of the present study is to investigate the ultimate capacity of perforated plates strengthened by using CFRPs under uniaxial compression along its longitudinal direction. A new test rig combined with an existing universal hydraulic testing machine has been designed to achieve simply supported along all edges. Some 36 plates were tested. Test results showed that if a CFRP is pasted on the convex surface of initial deflection, it will improve the capacity of uniaxially compressed perforated steel plates very well; otherwise, it will almost be of no effect. It also shows that the use of CFRP-strengthened perforated plates exhibit better results in a big slenderness plate with a small hole and a medium slenderness plate with a big hole. And with the use of CFRP-strengthened perforated plates with a certain plate slenderness ratio (b/t), such as b/t = 66, no matter how the size of the hole' diameter changes, the CFRP-strengthening effect remains stable. Also, it can be seen that the pasting of a CFRP cannot increase the stiffness before buckling, but it can improve the mechanical property afterwards.