Experimental Study On Shear Performance Of Embedded Corrugated Steel Web Connector

Shear connectors play an important role in steel-concrete composite structures,and effectively ensure the coordinated stress of steel and concrete.In recent years,domestic and foreign experts and scholars have conducted relevant research on the mechanical properties of embedded connectors in PC bridges with corrugated steel webs.Based on the previous push-out test of embedded connector with flange completed by the research group,it is found that when the thickness of steel flange plate is thin,it is prone to local instability under the action of shear force,resulting in the failure of the shear connector.To solve this problem,the main research contents and results of this paper are as follows:(1)In order to prevent the premature instability of the flange plate,studs were welded at the place where the ratio of width-to-thickness of flange plate is relatively large,and nine groups of specimens were tested.The test results show that the lateral stiffness of the flange plate after welding studs is enhanced,which effectively delays the premature instability in the flange trough area,and the shear performance of the connector is significantly improved.(2)The effects of width-to-thickness ratio of flange plate,embedded depth of corrugated web,thickness of corrugated web and diameter of joint steel bar on the shear capacity of the connector were analyzed.The calculation formula of bearing capacity of embedded connector with flange plate was verified by nine groups of push-out results.The results show that the width-to-thickness ratio of flange plate and the embedded depth of corrugated web are the main factors that affect the shear capacity of connectors,while the effect of thickness of corrugated web and diameter of joint steel bar on the ultimate bearing capacity can be ignored.The calculation formula of bearing capacity of embedded connector with flange plate can provide a certain reference for the design and calculation of embedded corrugated steel web connector.(3)The model of push-out piece was established by ABAQUS finite element software,and the finite element simulation results were compared with the push-out test results to verify the correctness of the finite element model.Furthermore,based on the model with flange plate thickness of 8mm,two studs were increased to strengthen the lateral stiffness of flange,to explore the changes of shear performance of connectors,and the amount of steel used for different specimens was compared.The results show that adding two studs to the specimen with the flange plate thickness of 8mm can significantly improve the shear performance,which is roughly equivalent to that of some specimens with the flange plate thickness of 10mm.In engineering application,the embedded depth and increasing the number of studs can be considered as the main factors for the optimization of steel consumption of embedded corrugated steel web connector.