论文部分内容阅读
本文对二次受力下碳纤维增强复合材料(CFRP)加固钢梁进行了静力试验,研究了不同程度初始应力对加固钢梁抗弯承载力及界面应力的影响;然后用有限元分析软件ANSYS对加固结构进行了数值模拟,并将模拟结果与试验结果进行对比验证,两者较为吻合。试验及模拟分析结果表明:初始应力会降低加固钢梁的抗弯承载力,但是可以减小胶层中的界面应力,减缓CFRP板从钢梁上的剥离。初始应力对加固钢梁的抗弯承载力及剥离破坏形式有着重要影响,在实际加固工程中不应忽视。通过试验与数值分析对比得到了一个可以精确模拟二次受力下CFRP板加固钢梁静力性能的有限元模型。
In this paper, the CFRP-strengthened steel beams under static load are studied by static test. The effect of different initial stresses on the flexural strength and interfacial stress of the strengthened steel beams is studied. Then the finite element analysis software ANSYS Structure of the numerical simulation, and the simulation results and test results to verify the comparison between the two is more consistent. The experimental and simulation results show that the initial stress will reduce the flexural capacity of the strengthened steel beam, but reduce the interfacial stress in the rubber layer and slow the exfoliation of the CFRP sheet from the steel beam. The initial stress has an important influence on the flexural capacity and the form of peel-off failure of reinforced steel beams, which should not be neglected in the actual strengthening project. A finite element model that can accurately simulate the static behavior of steel beams strengthened by CFRP plate under secondary stress is obtained by comparing the experimental and numerical analysis.