Research On The Flexural-tensile Properties Of High-performance Lightweight Composite Deck System

Fatigue cracking and pavement damage are two main problems for orthotropic deck pavement around the world. To solve these problems, “CRRPC-TPO” ultra-highperformance composed deck pavement system was introduced. The article is aimed at the non-linear whole process analysis of bending-tensile situation. The main results are as followed.Through the analysis and experiments on constitutive relations o f different materials, nonlinear bending-tensile simulations on “Steel-CRRPC-TPO” compound beam are ran to find out the suitable constitutive relations between steel, RPC and TPO in the new system.To gain the bending-curvature curve, programed a simulation and analysis program on compound beam considering different nonlinear constitutive relations between different materials. Using conjugate beam method, the load-curvature curve was gained. And To compare and analysis the simulation, bending-tensile experiments on compound beam are made, and the actual load-curvature curve is measured. After the comparison, the simulation follows the same law as real experiment, and the result fits well;Observe the whole deformation process of composite beams under bending and tension test, test the crack development, the results show that: there is no forming cracks at the stage of elastic composite beam with each layer in elastic deformation; there is small cracks of CRRPC matrix at the stage of stable expansion; macrosco pic crack at the stage of unstable propagation stage; rigid body rotation of CRRPC and TPO at both ends of the main crack at the stage of composite beam collapse, and the record of the width of the cracks is of no practical significance;Establish finite element local model on Mafang bridge,calculating stress and deformation results under test load, and conducting comparative analysis of calculated results and actual test results. The results show that both stress value and deformation values are in good a greement. The data calculating with the finite element local model is of certain referential significance. We have the most unfavorable load value and the corresponding stress value of steel bridge deck pavement under wheel load by numerical calculating wi th the specification of load test, and the result show the top surface maximum stress value of CRRPC ? TPO is 9.09 Mpa, 4.6Mpa respectively;Based on the method in mechanics of material, calculation on the compound beam under bending-tensile situation in elastic region is made and the maximum stress of different layers under ultimate load was gained. The results shows that the maximum tensile of CRRPC and TPO are 3.11 times and 2.9times higher than the result of finite model, which proves that the new system i s reliable and have enough safety reserve.