Experimental Study On The Connection Pattern Of FRP(Fib Er Reinforced Plastic/Polymer) T-shaped Joint

FRP(fiber reinforced plastic/polymer) is obviously superior to steel when being used in bridge structure owing to its advantages such as light weight and high strength, corrosion resistance and fatigue resistance. The problem of plastic bonding is the most crucial problem in the whole structural design. At the present stage, most scholars at home and abroad have done research into plastic sheets, but what is applied to actual engineering is FRP profile, so actual engineering requirements cannot be met. With tubular T-shaped joint in FRP profile as an object of study, this thesis makes a static test analysis of joint connection pattern to compare their advantages and disadvantages in bearing capacity, rigidity and ductility, in order to provide a technical reference for the practical engineering application of FRP profile in the future. The main content of this thesis is shown as follows:(1) Summarize the characteristics of different connection patterns as well as their advantages and disadvantages by looking up the domestic and foreign data related to composite connection. Sum up the different failure theories of FRP profile, and set a failure criterion for the plastics adopted in this paper.(2) First,Conduct a material test on FRP profile to identify the basic mechanical parameters of materials, to provide a basis for the subsequent finite element modeling analysis; Then,compare the load-displacement curve and stress distribution of critical joints under different connection patterns; analyze the failure characteristics and causes of different types of joints.(3) Analyze the stress performance of FRP joints using finite element software Patran, and explain the failure phenomenon appearing in test according to a finite element model. Compare the test result with the finite element model to verify the correctness of the model, to provide a technical support for further improvement of joint connection pattern in the future.(4) Carry out a parametric analysis for a theoretical analysis and test verification of the parameters that affect joint connection, to develop a relatively ideal structural form.