Seismic Damage Simulation Of Concrete Gravity Dams Reinforced With ERP

Concrete gravity dam, which is widely used in dam construction, has features of great bulk and long serve time, so reinforcement measure is the main anti-seismic restoration way. But as the traditional reinforcement material, steel has the properties of high weight and easy-to-corrosion, which reduce its service performance and work life. So it becomes a key point to find new reinforcement material to replace steel. FRP shows many positive properties of high strength-to-weight ratio and good resistance to corrosion against steel and is widely used in civil engineering. The paper emphasis on discussing the probability of concrete dam reinforced with FRP through analysis the reinforced effects. Based on concrete damage model considering mesoscopic heterogeneity, linear elastic model of FRP and simple interface bond-slip model, factors influencing the numerical simulation of concrete structure reinforced with FRP are studied, and the seismic response of concrete dam reinforced with and without FRP and interface mechanics behavior are also explored to provide credible evidence for FRP application in anti-seismic reinforcement of concrete gravity dam. The content of the paper covers the following two aspects:(1) In order to study the reinforcement effect of FRP in concrete dam, the constitutive models applied in the numerical simulation need to be demonstrated. So take a three-point bending concrete beam specimen as an example, concrete, FRP and adhesive layer are simulated by two conditions:plane element-plane element-plane element and plane element-Goodman element-link element, numerical results in both element simulation conditions accords with results of test, which verifies the validity of the presented model. Then basis on the aforementioned specimen, the influence of heterogeneity of concrete and properties of adhesive layer are studied, which declares the necessity of considering heterogeneity of concrete and the small influence of properties of adhesive layer on concrete’s main damage process. In the meantime, the comparison of damage processes of concrete beam without and with FRP verifies the effective restraint of FRP, and the interface mechanics behavior shows the stress transfer law of FRP and adhesive layer, which can provide a good indication of how FRP and concrete dam interface will work.(2) The reinforcement effects of FRP on concrete gravity dams needs to be studied. Herein take some concrete gravity dams with different feature for examples, seismic damage simulations are explored without and with FRP reinforcement on basis of time history method and quasi-static method. The dynamic nonlinear analysis indicates that FRP plays a significant role in increasing dam stiffness, controlling stress distribution, reducing cracking behavior, and consequently decreasing seismic disaster, and also interface mechanics behavior between FRP and concrete dam mainly accords with that of FRP and concrete beam specimen. The static nonlinear analysis shows that although the FRP reinforcement effects on different poor positions of concrete dam are different, it’s effective to improve seismic-resistant capacity of the dam and reduce the damage probability of poor positions.Through demonstration, the numerical models employed in simulation of concrete gravity dams reinforced with FRP is reasonable, and FRP material could improve the anti-seismic ability of dam, do it can be a prospective alternative for strengthening of concrete dams.