Mechanical Anarysis On Continuous Bridge Deck Pavement Under Temperature And Moing Load

The current method is widely used in mechanical analysis of bridge deck pavement,capture local beam segment in bridge structure with properly constraints, then analysis thestress of the pavement under the action of dead load, but for any bridge structure, inaddition to considering the deformation and stress caused by the dead load, the dynamiceffect of the external excitation should be considered. Long span concrete continuousgirder bridge under the action of temperature tends to have largerdeformation. The detection layer developed on shear strength shear tester for bridge deckpavement shear strength has been done. Based on field monitoring bridge temperaturefield of bridge deck pavement verified can correctly describe the distributionof temperature field of bridge deck pavement layer by using the finite element softwareABAQUS. To analysis the stress of bridge deck pavement accurately, the pavementmechanical response rule under the temperature and moving load should be analyzed, andsome cases for asphalt concrete bridge deck pavement design are provided.Based on the theory of dynamic load and temperature field theory in the paper, usingthe finite element method, a three dimension finite element model of three spanscontinuous box girder bridge was built by general finite element software ABAQUS, usinghalf-wave sinusoidal load and considering the effect of temperature, the asphalt concretebridge deck pavement was analyzed on mechanical time history response regularity underthe action of moving load and temperature, and analysis of pavement stress influence, thetemperature by hour, speed, overload, pavement modulus, proper thickness and bridgespans, and the maximum tensile stress in the pavement and the maximum shear stress inthe pavement layer thickness decreases with increasing thickness of pavement within acertain range.The research results show that the heat transfer in bridge deck pavement has time lagphenomenon, and the temperature fluctuations on box girder web position correspondingpavement is the more obvious. The most unfavorable position of asphalt concrete continuegirder bridge deck pavement under temperature and moving load is on the bearing, themaximum tensile stress is in the pavement surface, the maximum shear stress is betweenthe upper layer and the lower layer of the asphalt pavement, and the maximum transverseand longitudinal tensile stress increase fast with length of span, transverse tensile stress increases with the decreasing temperature by hour, the bigger the overload ratio, the greaterthe pavement stress, the maximum tensile stress and shear stress with speed increasingpresents a trend of decreasing.Put forward to the maximum tensile stress and the maximum shear stress of asphaltconcrete pavement as the main indicator of bridge deck pavement structural design, basedon interlayer shear test and asphalt concrete bridge deck pavement of highway asphaltpavement design specification. According to the bridge deck pavement stress analysisresults under the action of temperature and dynamic load, the reasonable thickness range ofpavement in different spans considering the stress index and economic factors have beengiven.