Analysis Of Coupling Temperature And Load On Steel Deck Pavement Structure Based On COMSOL

In this paper,the finite element model of steel bridge deck pavement structure was established based on the Nanjing Yangtze River Bridge maintenance project.Based on the basic laws of thermodynamics,the viscoelastic theory of weak-form partial differential equations and Norton-Bailey creep model,the steel bridge deck pavement layer was studied.The physical field environment affects its temperature stress and permanent deformation.The specific work and research results are as follows:(1)Combining with COMSOL,the weak form equations of heat conduction and thermal convection are proposed.According to the thermodynamic theory,the thermal physical parameters of the steel deck pavement material are clarified,and the structure of the paving structure and the structure of the orthotropic steel deck are considered.(2)The generalized Maxwell model was used to characterize the viscoelastic mechanical behavior of steel deck pavement material.The constitutive relation of viscoelastic materials was derived and deduced by COMSOL's weak-form partial differential equations.(3)The temperature and temperature stress distribution of the steel deck pavement during the winter and summer seasons is simulated.The simulation results are as follows: The maximum tensile stress on the surface of the actual pavement is about 1 MPa,and the longitudinal tensile stress is more unfavorable;the temperature stress on the surface of the pavement corresponding to the U-shaped rib top surface is greater than the area between U-shaped ribs.(4)The evolution of the strain distribution of steel deck pavements under vehicle loads is simulated.In the beginning,the area with high strain values was mainly generated in the middle of the two-wheeled wheel tracks and distributed in a strip.In the process of time,the area with high strain values gradually expanded and surrounded the load area.(5)Simulate the permanent deformation of the steel bridge deck pavement.The simulation results are as follows: The uplift phenomenon occurs at the center of the wheelmark.The depth of the rut is approximately 0.6mm;when the ground pressure of the vehicle load changes from 0.7MPa to 1.4MPa.Meanwhile,the depth of rutting generated by the vehicle loads on the pavement layer increased by about 120%.In summary,the theoretical analysis and numerical simulation of the coupling of temperature and load on steel bridge deck pavement have a certain guiding significance and practical application value for improving the analysis and design of the steel bridge deck pavement structure.