Method Research Of FRP In Anti-Corrosion And Strengthening Concrete Pier Based On Multi-factors Coupling

Rapid development of bridge construction along with our country economic growth, the durability of the pier refers to the reinforced concrete piers this article is attracting more and more people’s attention. Anti-corrosion and strengthening of the pier is urgent. Fiber Reinforced Polymer that is not only because of its well structure performance and has good durability. It has been important significance that FRP owned better durability has been applied to anti-corrosion strengthening of the bridge piers.The parameters of single factor model is based on the experimental data, and the aging test environment and physical environment are very different, so the model should be modified. Divided China’s environment in the extent of the impact of different factors, find out the different of the impact degree to the concrete, reinforcement and FRP in each region and test comparison, and determine the correction coefficients corresponding to different region model to get the single factor correction aging model.Single-factor correction aging model can not characterize the aging trend of its actual and need to be considered coupling Multi-factor aging model.Many factors influence aging of concrete,reinforced and FRP, not all considered, only can be determined the main influencing factors and the weight.Finally,the main influence factors corresponding correction aging model according to different weight coupling are superposed to obtain the multi-factors coupling final aging model.Established limit state equation based on durability and resistance effects, based on engineering target using period and the use multi-factor model,environmental action effects can be obtained by inversion methods. Get the relationship between tensile strength of FRP and the effective section thickness with the method of durability test, and then get the FRP durability resistance and amount of FRP obtained by the limit state equation.Compared with other FRP durability model of aging, parabola line model is to express the attenuation trend of durability index in a nonlinear way, calculated and measured error is small. The parameters of the model are only 2 and easy to obtain. Compared aging trend of coupling aging model with of the FRP in the natural environment,and found a downward trend consistent with the model curve, the model curve basic trends can be expressed durability of FRP natural environment. It is a good guidance to the study on design method of strengthening, and helps to improve the reliability of the design of reinforcement.