English：

In order to improve the performance and service life of steel bridge deck pavement for highspeed road in cold area, the influence of different thickness of bridge deck pavement layer on structuralbearing capacity, durability and construction cost should be considered. Based on the finite elementmodel of local girder segments, this paper investigated the temperature field distribution law of rigid deckpavement structure. At the same time, the structural temperature, mechanical response and permanentdeformation of GA+SMA steel bridge deck pavement layer under different thickness combinations werecompared. The analysis results showed that the thickness of the paving layer under low temperatureenvironment had certain influence on the surface temperature distribution of the structure, while thethickness of the paving layer under high temperature environment had little effect on the surfacetemperature. Under low⁃temperature environment, increasing the thickness of the upper layer couldeffectively reduce the surface tensile stress and inter layer shear stress of the paving structure, while thechange of the thickness of the lower layer has less effect on these stresses. Under high⁃temperatureenvironment, increasing the thickness of the upper layer can effectively reduce the permanent deformationof the paving structure, while the change of the thickness of the lower layer has less effect on thepermanent deformation. Considering the influence of thickness change on temperature, mechanicalresponse and permanent deformation of paving structure, 3cm paving lower layer + 4cm paving upper layer is recommended as the thickness combination of paving structure.