Study on Shear Resistance Performance of Small Shear Studs in Steel-Concrete Composite Deck
The shear resistance performance of small shear stud in steel-concrete composite deck is examined through a series of push-out tests,involving four different small shear stud connectors.Particularly,the failure modes,load capacity,load-slip relationships,and load-strain relationships are explored.The applicability of current formulas used to predict bearing capacity and rigidity is evaluated based on test results.The results show that the failure mode is related to the relative rigidity between the shear stud and the concrete.Small-diameter studs tend to shrink,while larger-diameter studs lead to concrete failure.However,lengthening the shear stud can significantly enhance the bearing capacity and prolong the stiffness decay process of the shear stud connectors.When the length of the shear stud increases from 40 mm to 60 mm,the bearing capacity Pu increases by about 16.7%while the slip Su corresponding to the peak load decreases by about 25.3%,and the ultimate slip Sm increases by 38.5%.Additionally,the patterns of crack formation and failure modes in concrete slabs with small shear stud connectors deviate from those observed in traditional deep-embedded shear stud push-out samples.The existing capacity calculation formulas,as per Chinese and American standards,demonstrates substantial discrepancies.In contrast,as per Japanese and European standards,the ratios of calculated values to the tested values are average 0.94 and 1.09 respectively without considering the safety factor,offering better estimations of bearing capacity.It is recommended to use these methods for bearing capacity calculation.Lastly,the connector's rigidity in elastic stage is the greatest and the recommended formula in the Chinese specification could be effectively used to predict shear rigidity.Even though shear studs are subjected to a combination of bending,tension,and shearing forces,the shear force is the primary factor.
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