关键词: 混杂加固, 钢筋混凝土梁, 界面应力, 参数化分析, 非线性有限元法

Abstract:

In this paper, the nonlinear finite element method is adopted to perform a parameterized analysis of the mechanical performances of concrete-to-FRP (Fiher-Reinforced Polymer) interface , indicating good accordance of the simulated interfacial stresses and the analytical ones. Then , the interfacial finite element models of the heams respectively with hybrid strengthening (CFS-GFS) and two-layer strengthening (CFS-CFS) are established and compared , demonstrating that the hybrid strengthening is an effective method with good interfacial hybrid effect because it can control the interfacial shear stress at the FRP end and can decrease the interfacial normal stress. Moreover, the effects of such parameters as the load , the Young's modulus and thickness of the adhesive as well as the FRP width on the interfacial mechanical performances are comparatively analyzed , finding that , with the increase in load and Y oung's modulus and with the decrease in adhesive thickness , the interfacial stresses at the beam end proportionally increase , while keep constant when the FRP width changes in a certain range.

Key words: hybrid strengthening, reinforced concrete heam, interfacial stress, parameterized analysis, nonlinear finite element method