| Recently,with the rapid growth of urban traffic and the influence of terrain and other factors,many large longitudinal overpass bridges have been established in the city,In rainy and snowy weather,the area of the city’s large longitudinal overpass bridge area snow and icing greatly affects traffic travel and brings hidden safety hazards;In view of this situation,this paper proposes a new type of steel box girder-steel grid bridge structure,the structure utilizes the characteristics of the wheelbase width and normal driving track range of the motor vehicle and the good sliding resistance,permeability and excellent carrying capacity of the steel grid plate.Each lane of the road surface is distributed and mixed with ordinary steel box girder bridge decks and steel grille deck decks,so that the vehicle can switch to the adjacent steel grille lanes under bad weather conditions to ensure the smoothness of the vehicle driving safety.At the same time,the rain and snow space is set under the grid bridge deck and connected to the drainage system,which greatly improves the drainage of the bridge deck;This new type of steel box girder-steel grid bridge structure is more suitable for urban large longitudinal overpasses,reducing the bridge length and improving the vehicle’s climbing ability;Based on this structure,the structure and local stress performance of this new type of steel box girder bridge structure need to be investigated and analyzed,so the main research work of this paper is as follows:(1)According to the characteristics of the steel box girder structure,the specific structural structure of the new steel box girder steel grid bridge structure is described in detail,and the layout of the driveway deck of this new steel box girder steel grid bridge structure is fully explained,and then sort out the calculation and analysis theory of this small steel box beam and steel grid.(2)Based on a new type of steel box girder-steel grid bridge structure,the Midas /Civil is used to establish the finite element calculation model,under the effect of concentrated load,the load lateral distribution of the new steel box girder steel grid bridge structure under the two connection forms of horizontal connecting beam and steel grid is analyzed.Then by comparing and analyzing with the traditional steel box girder under different horizontal connecting beam arrangement spacing,it is concluded that when the transverse connecting beams and the steel grid are connected horizontally,the lateral load distribution effect is basically equivalent to the traditional steel box beam,and the lateral load distribution effect mainly depends on the lateral connecting beams;the characteristics of the lateral load distribution and the effect of the lateral load distribution of the new steel box girder steel grid bridge are summarized.(3)The main beam of the new steel box girder and steel grid bridge is different from the traditional steel box girder.It is arranged by the small steel box beam and the steel grid plate.Because the steel grid plate is subjected to wheel load,it is directly transmitted to the adjacent small steel box.The beam flange plate makes the small steel box beam flange plate in an unfavorable state;Using MIDAS / FEA to establish a local solid sub-model,numerical simulation of the local mechanical performance of this small steel box girder roof system and steel grid plate,Through the analysis and calculation of the stress and deflection of the small steel box girder and the steel grid plate under the action of the wheel load of the vehicle,The longitudinal stiffener layout of the small steel box beam flange plate,the transverse stiffening beam layout and the different widths of the connection parts of the small steel box girder flange plate and the steel grid plate were analyzed respectively,to get the specific local component form suitable for the structure.Therefore,the local stress characteristics of the new steel box girder steel grid bridge under the wheel wheel pressure and other loads are summarized. |
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