Abstract
Punching shear is a brittle failure mode that may occur in slab-column connections, which may be prevented by using shear reinforcement in the slab-column connection. This paper presents comparisons between experimental results of 36 tests in internal slab-column connections with double- headed shear studs, which are largely used in North America, Europe and Asia, with theoretical results using recommendations presented by ACI 318, NBR6118, Eurocode 2 and also the Critical Shear Crack Theory (CSCT).Considering the database used it is possible to observe that ACI 318 presents conservative trends, whereas NBR 6118 showed a low coefficient of variation, but with a large number of unsafe results. Both Eurocode 2 and CSCT showed satisfactory results with Eurocode 2 presenting slightly higher performance.
Highlights
Flat slabs are laminated reinforced or prestressed concrete structures that are supported directly on columns
Punching shear is a brittle failure mode that may occur in slab-column connections, which may be prevented by using shear reinforcement in the slab-column connection
This paper presents comparisons between experimental results of 36 tests in internal slab-column connections with double- headed shear studs, which are largely used in North America, Europe and Asia, with theoretical results using recommendations presented by ACI 318, NBR6118, Eurocode 2 and the Critical Shear Crack Theory (CSCT).Considering the database used it is possible to observe that ACI 318 presents conservative trends, whereas NBR 6118 showed a low coefficient of variation, but with a large number of unsafe results
Summary
Flat slabs are laminated reinforced or prestressed concrete structures that are supported directly on columns. This paper aims to evaluate the recommendations presented by some of the main design codes for the estimation of punching resistance of reinforced concrete flat slabs with double-headed studs as shear reinforcement. This is performed through the comparison of the experimental results of 36 tests on flat slabs with the theoretical results obtained according to the recommendations presented by ACI 318M [1], Eurocode 2 [2] and NBR 6118 [3]. These comparisons are relevant especially because the last version of ACI and the recent version of fib Model Code 2010 [5] (based on CSCT) present specific treatments for the cases of slabs with studs as shear reinforcement
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