Coupled Vibration And Collision Analysis Of Heavy Vehicle And Wide Simply Supported Beam Based On LS-DYNA

In recent years,China’s transportation industry has developed rapidly.The speed and load of vehicles are also increasing day by day.The problems caused by vehicle-bridge coupling vibration are more and more prominent.The requirements for transportation infrastructure are also getting higher and higher.After the bridge is completed,it is necessary to carry out effective maintenance work in addition to a correct assessment of the bridge’s use status.This will be an important development direction in the future bridge engineering field.The vehicle-bridge coupling dynamic response problem has been studied and analyzed for more than 100 years.In the past,the analysis of this problem was generally to simplify the vehicle into several single-point concentrated loads,which is quite different from the actual situation.The treatment effect is not ideal.However,with the development of computer technology,accurate three-dimensional simulation of the whole vehicle-bridge coupling system has gradually emerged,providing a brand-new method for the current research and analysis of vehicle-bridge coupling dynamic response.In this paper,Solidworks,Hypermesh,LS-DYNA are used to build three-dimensional finite element models of heavy-duty heavy-cargo transportation vehicles and box-section simply-girder bridges,and three-dimensional finite element models of vehicle components such as wheels,suspension systems,vehicle superstructure and so on are defined precisely and pertinently,thus simplifying the vehicle superstructure.The contact algorithm owned by LS-DYNA software is used to realize the coupling of heavy heavy heavy transport vehicles and bridges.The accuracy of the vehicle model is verified by comparing the axle load contact force between the vehicle moving room and the bridge deck and the axle load force in the actual test.Taking a 44m span solid box-type simply supported girder bridge in Huai ’an Expressway as an example,a three-dimensional finite element model of the bridge is established.Modal analysis and equivalent static analysis are carried out on the bridge through the implicit algorithm of LS-DYNA,and the deflection variation and strain characteristics of the bridge under two conditions are studied.Using LS-DYNA’s powerful explicit solving function,the dynamic response characteristics of overweight trailers to simply supported beam bridges are studied.The dynamic characteristics of deflection and stress and strain of simply supported beam bridges under overweight vehicles and normal load bias at different driving speeds are analyzed and solved through three load cases.At the same time,a three-dimensional finite element model of double-wave type protection sample commonly used on expressways is established,and the influences of factors such as small pickup trucks,large heavy trucks and different collision angles on the deformation,stress,strain,acceleration of the vehicle body and several states such as preventing the vehicle body from rushing out of the lane after the vehicle collides with the guardrail are analyzed,and the influence factors of the vehicle colliding with the guardrail and the traveling overweight vehicle on the simply supported beam bridge are further summarized.