Dynamic Response Of Double-curved Arch Bridge Under Moving Load

As a unique deck arch bridge,double-curved arch bridges are more common in southwest my country.However,due to their unique force form and longer construction time,they have greater capacity to withstand larger or higher-speed moving loads.Possibility of destruction.This paper takes the Sanjiangkou Bridge in Sanjiangkou Town,Fuquan City,Guizhou Province as the research object.Through theoretical analysis,finite element modeling calculation and comparison with field monitoring data,the dynamic performance of the bridge and the dynamic response under live load are analyzed.The research done in this article is as follows:(1)According to the bridge design drawing and use the finite element software Midas Civil to model and analyze it,the obtained natural vibration mode and the internal force and displacement at the intersection of the column,the column and the arch rib under the action of its own weight are carried out with the field monitoring data The comparison confirmed the relative accuracy of the simulation results,and then the numerical simulation data was used to analyze the dynamic response of the bridge.(2)Through the vehicle-bridge coupling theory,the bridge and vehicle loads are theoretically analyzed,and the internal force generated by the arch ribs of the bridge under the deviating load is calculated at the same time.(3)Through software simulation of the deformation of the arch bridge,the stress of the column,and the stress of the solid element under different working conditions such as vehicle normal load,eccentric load,overspeed,and whether the internal force of the arch rib is considered,the dynamics under various conditions are compared and studied.Respond to the difference and analyze the cause of the damage to the bridge structure.Through research,it is found that the eccentric load has a great influence on the shear stress in the y-direction of the column and the stress in the y-direction of the vault;vehicle speeding has a certain influence on the deformation of the bridge;under long-term overload,the stress of the vault filling material has a negative value.It is very possible that extrusion and stretching alternately occur,which seriously affects the safety performance of the bridge;and considering the internal force of the arch rib,the shear stress of the column along the bridge direction has a significant increase,which has a certain impact on the performance of the column.Figure[35]table[30]reference[83]...