Simulation And Fatigue Experiment Of GFRP-Concrete Composite Deck

Fiber Reinforced Polymer(FRP)has the advantages of light quality,high strength,good durability and fatigue resistance.It has been widely used in the field of civil engineering.GFRP-concrete composite bridge deck is a new type of composite structure formed by GFRP and concrete through effective interface treatment.This structure can improve the durability and fatigue resistance of the bridge.It can obtain higher bearing capacity through reasonable design,so the application prospect of the new and reinforced bridge field is broad.In order to ensure the safety of construction,the static and fatigue properties of the GFRP-concrete composite bridge deck were studied in this paper.The main research work consisted of four parts:(1)Bending test of composite bridge deck.The static and fatigue mechanical properties of the GFRP-concrete composite bridge deck were studied by bending static and fatigue loading test.The test results showed that the ultimate bearing capacity and failure mode of the selected GFRP-concrete composite bridge deck were basically the same as that of the reinforced concrete slab,and the GFRP-concrete composite bridge deck can resist fatigue effectively.(2)Static finite element analysis of GFRP-concrete composite deck.The finite element simulation analysis of the mechanical properties of GFRP-concrete composite plate is carried out by ANSYS.The calculated values were in good agreement with the test values.On this basis,the effects of interface shear strength,GFRP elastic modulus,concrete slab thickness and concrete strength on the mechanical behavior of composite panels were studied..(3)Numerical simulation of fatigue for GFRP-concrete composite deck.The corresponding constitutive model and failure criterion were selected to simulate the fatigue performance of GFRP-concrete composite plate by finite element method and layered method.The calculated values were in good agreement with the test values,and can be used to predict the deflection and strain of the components effectively.On this basis,the static and fatigue tests of specimens with the same strength of concrete were compared and the bearing capacity of specimens after fatigue was reduced by 9.1%.(4)Finite element analysis of GFRP-concrete steel composite girder bridge panel.The finite element analysis of the unit width model of the actual bridge was carried out by ANSYS to study the transverse force performance.The results showed that the bridge deck can effectively resist the fatigue problem caused by the lateral tension and improve the durability of the bridge effectively.