Study On Mechanical Performance Of Steel Concrete Composite Beam Bridge

The prefabricated steel-concrete composite girder bridge connects the precast concrete slab and the steel girder together through studs,which are shear connectors,to work together and work together.Such a composite girder bridge structure can better exert the resistance of concrete.The advantages of good compressive properties and good tensile properties of steel.The most critical element for the combined structure to be connected together is the studs.This article proposes a new type of horizontally arranged studs to explore the performance pros and cons of the conventional vertical studs,in order to understand this kind of horizontally arranged studs.The specific parameters and data comparison of the shear performance of the studs in the layout form are selected.The ABAQUS finite element analysis software is used to establish the specimen model manufactured by the predecessors during the push-out test.The influence factors of various parameters are used to study the shear bearing capacity.Influence;then establish the finite element model of the beam middle part,the beam end part and the beam middle part and the beam end part of the horizontally arranged studs,and the combination of the two parameters of different diameters and different arrangement spacings The influence of the flexural bearing capacity of the middle part of the beam and the end part of the beam provides a reference for future experimental research and application.The main work and conclusions are as follows:(1)Establish the finite element model of the push-out specimen for the lateral arrangement of studs through ABAQUS software,and explore the influence of the diameter of the studs,the yield strength of the studs,and the concrete strength level on the shear performance of the studs that are arranged horizontally.Through research and analysis: as the diameter of the horizontally arranged studs increases,the shear bearing capacity is significantly improved;the studs’ shear bearing capacity increases with the increase in the yield strength of the studs,and the studs with smaller diameters increase Is more obvious;the increase of concrete strength grade has limited increase in the shear resistance of studs,which is not very obvious;(2)Establish 2 types and 4 groups of finite element models of push-out specimens through ABAQUS software,and compare and analyze the sliding performance of push-out specimens with studs horizontally arranged and push-out specimens with studs arranged vertically.The research results show that: horizontally arranged push-out specimens The ultimate bearing capacity of studs is larger than that of vertically arranged studs.After reaching the ultimate bearing capacity,the sliding platform appearing in the load-slip curve of the former is also much larger than that of the latter,indicating that the horizontally arranged bolts The nail ductility should be better,and the sliding performance should be better;(3)Establish the finite element model of 2 types and 4 groups of push-out specimens through ABAQUS software,and compare and analyze the shear stiffness of push-out specimens with studs horizontally arranged and push-out specimens with studs arranged vertically.According to 《Eurocode 4》 and Chang-Su Shim proposed an approximate calculation formula for the shear stiffness of the studs based on the regression analysis of the test data.The studs’ normal service limit state shear stiffness Ke and ultimate bearing capacity state shear stiffness Kp were obtained,and the normal use of transverse nails was found In the ultimate state,it is obviously larger than the vertical nail,and after reaching the ultimate state of bearing capacity,the shear stiffness of the two is still the value of the transversely arranged studs.The shear stiffness of the studs is larger;(4)Use the ABAQUS software to establish the finite element model of the beam and the beam end part of the assembled steel-concrete composite beam with studs arranged horizontally and the beam end part of the assembled steel-concrete composite beam and the beam end with the studs arranged vertically,and explore the studs The influence of different diameters and different arrangement spacing of studs on the flexural performance of the middle part and the end part of the composite beam.Studies have shown that when the studs have the same diameter and the ratio of the transverse nails to the vertical nails is 1:2,both the middle part of the beam and the beam end parts show the ultimate flexural bearing capacity of the composite beam with the studs horizontally arranged.It is larger than the composite beam with the vertical arrangement of studs.It can be seen that the horizontal arrangement of studs not only has a significant effect on improving the flexural bearing capacity,but also realizes the fully assembled construction;and the difference in the arrangement of the studs has changed.The degree of shear connection of composite beams.With the increase of the degree of shear connection,the flexural bearing capacity of the middle part and the end part of the composite beam has been improved,and the composite beam with high degree of shear connection reaches the ultimate bearing capacity.The deflection value corresponding to the force is smaller.Figure[49];table[9];reference[50]...