Parametric Analysis Of Vehicle Jumping Response At Bridge Approach And Comparative Study On Treatment Effect

With the rapid development of China's economy,the mileage of highway construction and the number of bridges have rapidly increased.Due to the excessive lack of construction time and lack of experience technology,many late-stage operational problems have also been brought about.The most common one is the road and bridge transitional road surface backfill at the back of the platform.Severe diseases such as subsidence or fracture have caused a large step or vertical slope between the road and the abutment,causing the phenomenon of vehicle bumping at the bridgehead,which seriously affects the safety of driving,and increases the road maintenance due to the impact of vehicle jumping.Difficulties in maintenance and costs,the problem of bridgehead jumping has caused widespread concern in the engineering community.At present,there are still no well-solved measures in engineering.Based on this article,we carried out in-depth research on the various treatment methods of transitional sections of roads and bridges.Firstly,the Winkler foundation beam or slab model of the bridge deck is established based on the theory of the Winkler elastic foundation beam,and the deflection equation of the foundation beam or slab is solved according to the boundary conditions with one end fixed and one free end,and the mechanism of the slab interaction is analyzed.It provides the theoretical support for the subsequent finite element numerical simulation analysis;it simplifies the slab to the isotropic thin plate model on the viscoelastic foundation and analyzes the dynamic response of the slab.Secondly,the numerical simulation and parametric analysis of three commonly used bridgehead tripping methods of single-story slabs,multi-layer flexible slabs and pile-concrete slabs are given,and reference suggestions are given for the values of various treatment methods.A new type of double-rigid rigid plate treatment method was adopted,and the different treatment methods were compared and analyzed from the treatment effect,technical feasibility,economic benefits,and social benefits.The results showed that the double rigid plate and pile-concrete plate treatment method With great treatment advantages,the treatment effect is obvious.The impact of jumping into a transient half-wave sine loading wave was established.The dynamic response analysis model of the transition section model was established.The dynamic response of vario us treatment methods was compared and analyzed.The pile-concrete slab and double deck treatment methods were better.The vibration-absorbing performance is a relatively preferred way to handle the bridgehead bump.Finally,using fly ash and EPS concrete with small bulk density,high strength,and low compressibility,it is used as a backfill for road and bridge transition sections,and is comprehensively selected from soil settlement deformation,soil stability,and abutment earth pressure.Analyze the treatment effect of fly ash and EPS concrete.In addition,the BP network algorithm was used to optimize the parameters of the backfill materials,and the suggestions for the selection of backfill materials for the transition zone of the road and bridge were given.