Experimental Study On Mechanical Behavior Of CFRP Tendons Used In Tied Arch Bridge

This paper is backgrounded by the Natural Science Foundation of Hunan Province, China(06JJ2101) "Application Study And Mechanical Behavior Analysis of Long-Span Bracing Arch Birdge with CFRP Suspenders". In this paper, relying on the Wushui Bridge, according to similarity principle, a scaled test model of bowstring arch bridge appling carbon fiber reinforced plastic is established. And the spatial finite element analysis software Midas/Civil is used to simulate every condition of model bridge in service phase. Detailed test data and reliable theoretical basis are provided for carbon fiber reinforced plastic tendons popularize and apply in the arch bridge. Following work are completed:the types and properties of FRP bar and CFRP application research status at home and abroad are summarized. Based on the mechanical characteristics of bowstring arch bridge, finite element model is established by spatial finite element analysis program "Midas/Civil". Through similarity analysis we determine section shape and size of the model's components and make the test mode. It is analysed that deformation of CFRP bowstring arch model bridge and stress states of arch ribs, CFRP tie bars, longerons, suspenders, etc. Model experiment results and finite element analysis results were compared to investigate the correctness of the theory analysis results.Through the comparison between finite element analysis data and model bridge experimental data, results showed that:the deflection and stress results of model in service phase were linear with the load in every condition. The measured values and the finite element theoretical values are relatively close. Stress levels are relatively low, it meets the needs of the structure stress. Steel box tied arch bridge with CFRP tie bar meets the demand of design and norms. The measurement results of CFRP tie bars tension values and arch feet horizontal displacement values coincide with the finite element analysis ones. This showes that using analysis results calculated by finite element analysis program to guide loading model bridge and selecting measuring point is feasible, the analysis results are correct. The maximum measured value of CFRP tie bars prestressing loss rate is 2.1%. The loss of prestress is smaller. Their prestressed values are stability.It is feasible that tied arch bridge applies carbon fiber reinforced plastic (CFRP) suspension and tie rod. It can improve the tied arch bridge spanning capacity and also improve competitiveness of the tied arch bridge in long-span bridge system. With the production technology of fiber reinforced plastic (CFRP) being improved, its economic benefits become apparent.