Numerical Simulation Study On Uplift Bearing Characteristics Of Multi-walled Supporting Piles

The rapid passage of the vehicle through the bridge will cause impact on the bridge,cause the bridge to vibrate,and have a certain impact on the stability,safety,and durability of the bridge structure;and the vibration of the bridge will be fed back to the vehicle to make the vehicle stable,safe and comfort are affected to some extent.The impact of this extremely complex interaction and superposition on the bridge structure and driving safety cannot be ignored.This paper is based on the study of the bridge-vehicle resonance problem of common bridges,and establishes a common bridge finite element model.It uses the two inevitable common factors of vehicle weight and speed to set up four working conditions,and analyzes the continuous concrete beams that are established.The dynamic performance of bridges and continuous curved beams under these six operating conditions,compared with the deformation and deformation trend of key parts,provides a basis for controlling the vibration and deformation control of bridges.Concluded as follow:(1)At the same vehicle speed,the vehicle load increases and the bridge structure deformation increases.Due to the structural weight and vehicle impact,the deformation at the mid-span is significantly greater than that near the bridge pier.Under the same vehicle load,the vehicle speed increases and the deformation of the bridge structure will also be Increase.Therefore,in the design of bridge structures,the establishment of pre-camber is very necessary.Compared with the increase in vehicle speed,the increase in vehicle load has a significant effect on the increase in the deformation of the continuous bridge structure.Overload is the primary reason that affects the stability and safety of the continuous bridge structure.Therefore,in actual life,the load of vehicles crossing the bridge should be strictly limited.(2)As for the mid-span acceleration,its change is constantly fluctuating,and the absolute values of the peaks and troughs are approximately equal.This deformation trend also reflects the vibration characteristics of the axle resonance.(3)When the vehicle leaves the bridge,the amplitude of the bridge’s vibration will increase slightly,and then return to rest with the passage of time.Therefore,the contact between the bridge and the road surface must be leveled,which is beneficial to the impact and vibration of the bridge structure(4)The increase in the number of vehicles on the same span will also increase the deformation of the span.For continuous rigid-frame bridges and curved bridges,an appropriate increase in the number of vehicles may reduce the mid-span acceleration,which is beneficial to the earthquake resistance of bridge structures.(5)When there is continuous traffic flow on the bridge,the deformation of the bridge will fluctuate around the maximum deformation value.The magnitude of the fluctuation is related to the connection between the bridge and the pier.If it is a rigid connection,the fluctuation will be larger,which will affect the driving comfort.If it is elastic When the support is connected,the degree of fluctuation will be reduced,and the elastic support does have a certain vibration isolation effect In the design,priority should be given to elastic bearings.Figure 107 Table 26 References 80...