Numerical Simulation Analysis Of Group Stud Connectors In Steel-Concrete Composite Structure

The steel-concrete composite structure is widely used in the field of civil engineering construction due to its unique structural form and good mechanical properties,and it is an important structural form in the construction of bridge engineering.Among its components,the shear connector plays a vital role,and its performance even determines the overall performance of the steel-concrete composite structure.The shear connector connects the steel longitudinal beam and the concrete slab into a whole,and mainly plays the function of bearing the longitudinal shear force at the interface between the steel beam and the concrete slab,so that the two cannot slide relative to each other.However,with the emergence and application of new structures and new materials,the form of shear connectors should also keep pace with the times,and related research theories need to be updated and improved.In view of this,this article is based on the rapid transformation project of Xiangfu Road in Changsha as the research background,and takes the innovative method of staggered arrangement of the cluster stud connectors in the steel-concrete slab structure of the project viaduct in the form of different lengths as the research object.The finite element software ABAQUS was used to establish a numerical analysis model of the push-out specimens in a document that staggered the stud connectors in different lengths to analyze the shear performance.Finally,a section of steelconcrete composite beams with clustered stud connectors staggered in different lengths is designed,and its finite element numerical analysis model is established to analyze the flexural performance.Through the above research,the main research results obtained are as follows:(1)A brief introduction to the concept and importance of shear connectors,and a summary of the scientific research work of domestic and foreign experts and scholars on shear connectors,including the development status,working principles and failure modes of shear connectors,The advantages and disadvantages of different types of shear connectors,the test methods for the shear capacity of shear connectors,the calculation formula of shear capacity and the influencing factors of shear capacity,etc.,provide theoretical support for the subsequent research work.It also provides relevant theoretical guidance for subsequent researchers.(2)Refer to the numerical analysis model of push-out specimens in which the stud connectors are staggered in different lengths in the relevant literature,carry out finite element numerical simulation analysis,and compare the calculated results of the obtained numerical simulation specimens with the actual push-out specimens.Confirm the accuracy of the finite element simulation method.At the same time,by changing the arrangement length,diameter and shear strength of the studs,the parametric analysis is carried out to explore the influence of the length arrangement form,diameter and shear strength of the studs on the shear capacity of the test piece.Studies have shown that the use of studs of different lengths has little effect on the shear bearing capacity of the connector.Changing the stud diameter and the yield strength of the stud has a certain impact on the shear bearing capacity of the connector,and increases with the diameter of the stud.Increasing or increasing the yield strength of the stud,the shear bearing capacity of the stud connector will also be improved to a greater extent.(3)Through changing the length arrangement form of the stud connectors in the composite beam,the layout spacing of the stud connectors and the number of stud connectors,the parameter analysis is carried out to explore the influence of the changes of various parameters on the flexural performance of the composite beam.After extracting the load-deflection curve of each composite beam model and comparing it,it is found that the length arrangement form of the stud connector and the layout distance of the stud connector have little effect on the flexural bearing capacity of the composite beam.The number of stud connectors has a certain impact on its flexural capacity.As the number of studs increases,the composite beam’s flexural capacity increases.Then extract the deflection of each composite beam model when the ultimate bearing capacity is reached for comparison,and it is found that the length arrangement form of the stud connectors,the arrangement spacing of the stud connectors,and the number of stud connectors will have different degrees of influence.Generally speaking,as the length of the studs decreases,the spacing between studs and the number of studs decrease,the deflection of the composite beam also decreases.