Analysis Of Bond Performance Between FRP And Brick With Cohesive Zone Model

Fiber reinforced polymer (FRP) has been widely used to strengthen deficientmasonry structure. The behaviour of the FRP-brick interface is crucial to transferringstresses. Indeed,a number of failure modes in FRP-strengthened Masonry Structuresare directly caused by debonding of FRP from the masonry.The performance of theinterface between FRP and masonry is one of the key factor affecting the behavior ofthe strengthened structure. Therefore,for the safe and economic design of externallybonded FRP systems,the behavior of the FRP-to-masonry interface needs to beresearched.The bond strength between FRP and brick is an important design parameter,whichcan be measured by a single shear test. The main factors influencing the bondstrength of FRP-brick is bond length and width,types of FRP,layers,brick compressivestrength and type of bonding epoxy adhesives. Through analysis of the collected testdata,the influence of bond layers,types of FRP and brick compressive strength on theeffective bond length of FRP-brick are investigated,and formulas for calculating theeffective bond length between FRP and brick are proposed. Based on Cohesive ZoneModel,a local bond stress-slip models is proposed. It based on the energy method offracture mechanics,then deduces the compute formula of the single shear bearingcapacity between FRP and brick. At last,a computational model is proposed in thispaper to simulate the transmission of stress interface between FRP and brick. Usingthe computational model,the load-displacement curve and the bond stressdistributions of FRP-brick interface are simulated successfully.