Dynamic Characteristics Research Of Tire And Large Displacement Bridge Expansion Joints System

It makes the demand for large displacement bridge expansion joints very urgent as a mass of long-span bridges were constructed. The design, manufacture and maintenance of the expansion joints needs theoretical research guidance. So it’s very essential to do some indepth research on the expansion joints. This paper makes vehicle’s tire and the expansion joints a system and researchs the contact effect when the vehicle passes the expansion joints. An analysis of the tire’s dynamic response during the passing period is discussed. Applying ABAQUS to finish the simulation for the contact and dynamic response.Making a contrast with the condition of neglecting tire’s effect.Firstly, a general research on finite element modeling of truck tire in ABAQUS is finished. The complex tire structure is simplified reasonably. A material parameter definition problem for rubber and cord thread composite structure is solved. Proposing the key techniques for tire finite element modeling. Secondly, the veracity of the finite element model is verified. An analysis of static load, stiffness and rolling for the tire is discussed. Thirdly, exerting a force to the tire so that obtaining the regularity of mid-beam’s load when the truck passes the expansion joints. Finally, a research on vertical displacement response regularity when the expansion joints is forced is finished. An analysis of the reason for mid-beam’s complex displacement response is discussed. The impact factor of the expansion jionts is researched. The relation between velocity and impact factor is analysed.Reserching conclusions include following contents. First, the most complex rubber and cord thread composite structure is simulated with feinforing rebar model. A parameter transformation is essential between the 2-D model and 3-D model of the tire. Second, when the tire is exerted a rated load, there is a under 5% data error of contact area and sink displacement between simulation and test, and this result proves the tire model has a good veracity. Third, when interacts with the expansion joints, the tire contacts with two mid-beams at least and three beams at most. The amplitude of the load of the mid-beam decreases obviously compared with the condition of neglecting tire’s effect. Forth, the stiffness of the expansion joints needed≥50000N/mm. When the stiffness is same, the maximum vertical displacement decreases 31.25% relative to the condition of neglecting tire’s effect.The beam of maximum displacement is not identical in different velocity. The maximum vertical displacement increases with the increasing of velocity, and the maximum impactor fact increases with the increasing of velocity and tire pressure. Controling the velocity under 60km/h can decrease the expansion joints’ vertical displacement and impact facor.