CFRP加固开孔钢板的静力力学性能研究

Study on Static Mechanical Properties of CFRP Reinforced Open-Hole Steel Plate

采用中心CFRP加固开孔钢板的单轴拉伸试验,对6 mm厚开孔钢板采用1-3层CFRP加固,对3 mm厚开孔钢板采用1-2层CFRP加固,研究了CFRP加固层数和钢板厚度对开孔钢板试件的影响。试件在单轴拉伸荷载作用下有4种典型的破坏形态,破坏形态与CFRP的层数以及CFRP与钢板之间结构胶的粘接强度有关。试验结果表明,随着CFRP层数的增加,试件的极限承载力呈线性增大,而极限位移却减少;开孔钢板的厚度不同,CFRP的加固效果也不同。同时,还通过在试件钢材表面和CFRP表面粘贴应变片的方法测量试件在单轴拉伸荷载下各关键部位的应变值,测得了加载过程中未加固试件和单层CFRP双面加固试件表面各点的应变变化特征。

In this paper, the open-hole steel plate with 6mm thick is strengthened by 1-3 layers of CFRP, while the open steel plate with 3ram thick is strengthened by 1-2 CFRP. The effect of CFRP reinforcement layer number and steel plate thickness on the perforated steel plate is studied by the uniaxial tensile test. The test results show that with the increase of CFRP number, the ultimate bearing capacity of specimens increases linearly, while the ultimate displacement decreases. And the reinforcement effect of CFRP is different from the thickness of steel plate. In addition, the key parts on steel and CFRP of the surface of specimens have been measured the strain values under uniaxial tensile loads, and the transmission mecha- nism between the steel and CFRP under single CFRP double side reinforcement is studied.