Study On Dynamic Response Of Steel-concrete Composite Deck Pavement Under Vehicle Load

Steel-concrete composite bridges have been widely promoted and applied in China due to their many advantages such as large span,high strength and light weight.At present,the design and construction of bridge structures in China have reached the international advanced level,but the research on the design specifications of highway and bridge deck pavements is relatively lagging behind.In recent years,with the rapid development of China’s logistics and transportation industry,overload and overspeed phenomena have occurred all over the place,resulting in the steel-concrete composite bridge deck pavement layer not reaching its design service life,that is,serious diseases have occurred,causing great losses.Therefore,the research on the dynamic response of steel bridge deck pavement under vehicle load has great practical application value,and the obtained results provide theoretical basis for pavement layer structure design.This paper taking a highway steel-concrete composite bridge as the research object,considers the viscoelasticity of pavement layer asphalt concrete,and studies and analyzes its dynamic response under vehicle load.The main research contents are as follows:(1)Based on the general finite element software ABAQUS,the finite element model of the radial tire and superstructure of the three-span steel-concrete composite bridge with pavement layer is established.The vibration equation of the nine-degrees-of-freedom vehicle were derived based on the D’Alembert principle.(2)Using the random phase cosine superposition method,the Matlab/Simulink module was used to simulate the bridge surface irregularity,and the A and C grade road irregularities classified by the national standard GB/T7031-86 are simulated.(3)Taking the steel-concrete composite bridge as the research object,the dynamic responses of the moving uniform load based on ABAQUS and the multi-rigid body vehicle based on UM are analyzed respectively.The results of calculation and experiment are compared to verify the correctness of the model.(4)Based on the validation of the model established in this paper,the dynamic response of the pavement of steel-concrete composite bridge under the action of double-wheel rectangular uniform load and radial truck tire commonly used in the Code for Design of Highway Asphalt Pavement is calculated.The loads applied on the radial truck tire are all from the coupled axle forces on the rear axle side of the multi-rigid body vehicle model.Because the viscoelasticity of the material can not be considered by UM simulation software,it is necessary to extract the coupled axle forces on the rear axle side and apply them to the tire.Finally,considering the viscoelastic constitutive relationship of asphalt materials and pavement irregularity,the influence of different speed,different load,different axle number and different span on Pavement of steel-concrete composite bridge is analyzed by ABAQUS finite element software.