Dynamic Response Analysis Of Suspender’s Fracture In Half Through Or Through Arch Bridge

In the recent years,the half through or through arch bridge has been a great development due to its own reasonable force,attractive appearance and other characteristics.And the suspender as a key component connecting the arch ribs and the bridge deck,the dead load and live load of the bridge system are transferred to the arch rib,which is the main bearing component of the half through or through arch bridge.And compared with the bridge deck and arch rib,suspenders are more susceptible to fatigue or corrosion damage,if there is a problem with the suspender may cause partial or overall damage to the ribs,serious can lead to the collapse of the bridge deck.To a certain extent,determin the safety and service life of the arch bridge structure.In this paper,the dynamic response of the structure of the suspender’fracture is studied.Based on the engineering background of Liu Jiang Yellow River Bridge in Zhengzhou,using ANSYS finite element software,establishes standard cross-space beam element model of Zhengzhou Liujiang Yellow River Bridge.The dynamic response of the structure is analyzed and compared.The main research contents and conclusions of this thesis are as follows:(1)This thesis uses ANSYS finite element software,and establishes standard cross-space beam element model of Zhengzhou Liujiang Yellow River Bridge.The correctness of the finite element model is verified by comparing the calculated values of the calculated cable values with the design values given by the drawings.(2)The advantages and disadvantages of the two kinds of simulated suspender breaking methods are compared and the simulation method adopted in this paper is determined.According to the principle of the most unfavorable load,the broken suspender is selected to calculate the damping size in the simulation process,and the breaking time of the suspender is determined.The dynamic response of the structure is studied by breaking the short suspender and breaking the long suspender.(3)The impact of the breakage on the bridge deck is much greater than that on the arch ribs,and as the distance increases,the effect decreases.When the suspender is broken continuously,it will cause a sharp increase in the internal force of the adjacent suspender.If the safety factor of the suspender is too small,it may cause the remaining suspender to break continuously and eventually lead to the collapse of the structure.(4)By comparing the results of dynamic analysis and static analysis,it is found that the full-bridge force state calculated by the static method is very different from the dynamic state of the full-bridge obtained by the dynamic analysis.Therefore,it is not possible to replace the dynamic simulation of the breaking process directly with the static analysis method...