Study On The Construction And Mechanical Properties Of New I-Steel-Steel Grating Bridges

in recent years,some cities have built large longitudinal slope viaduct ease traffic,but because of the rain and snow weather or the limitation of geographical conditions,the traditional large longitudinal slope viaduct bridge panel anti-sliding performance and processing capacity can’t meet the snow and ice to traffic conditions,in order to improve road traffic capacity,snow area based on the application prospect of i-steel structure on bridge,put forward a new type of i-steel steel grille and bridge structure.The structure makes full use of the wheel range and normal running track of the motor vehicle,as well as the good carrying capacity,permeability and anti-skid performance of the grille,adopts the mode of spacing distribution and mixed pavement of the common road surface and grille road surface of the motor vehicle,and sets the snow space under the steel grille bridge deck and connects the drainage system.In normal weather,the motor vehicle tires run over the traditional bridge deck,in severe rain and snow weather,the motor vehicle on the grille lane.According to the structural form of the new I-steel-steel grid,the research contents of this paper are as follows:(1)The structure of i-beam is described in detail with a bridge as the background.According to the characteristics of steel grid structure,three forms of steel grid connection structure in new i-steel and steel grid bridge are put forward,and the structural form of steel grid connection in new I-steel and steel grid bridge is elaborated in detail,and the calculation and analysis theory of steel grid is also sorted out.(2)Taking a bridge as the background,using MIDAS/FEA,respectively set up steel grille plates and beam connection,steel grille flat steel and flange connection,steel grille flat steel girders with beam and girder flange connection at the same time,the novel i-steel steel grille and bridge local plate element model,the different connection structure of new type i-beam steel grille bridge girders,beams and comparing the mechanical properties of steel grille,sums up the connection the static characteristics of structure under different conditions;Based on the new i-steel grid bridge model,the lapping length of steel grid flat steel and main girder flange is changed,and the reasonable lapping length of steel grid flat steel is summarized through analysis;Under the model of a new i-steel grille bridge with steel grille and crossbeam,the mechanical behavior of steel grille bridge with longitudinal disconnection to small crossbeam is studied;The number of small beams between the large beams is changed under the new I-steel grid bridge model connecting the steel grid and the main girder flange;Under the new i-steel grille bridge model connecting the steel grille and main girder flange,the steel grille model is changed,and the steel grille model is selected through analysis.(3)For new joist steel grille and bridge load transverse distribution coefficient under different connection structure problem,using MIDAS/CIVIL build steel grille plates and beam connection,steel grille flat steel and flange connection,steel grille flat steel girders with beam and girder flange connection at the same time,the novel i-steel steel grille and bridge the whole beam element model,through calculation and analysis,to extract the deflection of the beam cross section in the center of the value,and the formula to calculate the load transverse distribution coefficient,through comparative analysis,summed up the new I iron-steel grille bridge under different connection structure characteristics of the load transverse distribution.