Abstract
RC slab–column structures are widely used because of the advantages of small space occupation for horizontal members, easy construction and good economy. However, slab–column joints are prone to punching shear failures, which deteriorates structural safety. This paper provides an analytical model to predict the punching shear capacity of the RC slab–column joint. A database of 251 test results is established for the shear punching capacity of slab–column joints without punching shear reinforcement. The performance of existing design codes in predicting the shear resistance of slab–column joints is investigated and compared based on the database. Then, based on the modified compression field theory (MCFT) model, an equation for calculating the punching shear resistance of slab–column joints without punching shear reinforcement is established. The prediction results of the analytical model are enhanced by using the regression analysis method. The model proposed in this paper is based on both reliable theoretical and the summary of a large number of test results, which has higher prediction accuracy than the design codes.
Highlights
The RC slab–column structure has no beams between the columns, and is a form transfer load directly from slabs to columns [1,2]
The purpose of this paper is to establish an analytical model for punching shear capacity of RC slab–column joint that is based on justified theoretical deduction and the experimental database
The specimens selected in the database are RC slab–column joints, and the proportion of high-strength concrete resistance capacity can be increased at least 10%
Summary
The RC slab–column structure has no beams between the columns, and is a form transfer load directly from slabs to columns [1,2]. The slab–column structure has the advantages of flexible layout, full use of height space, fast construction speed and low cost. It is widely used in warehouses, underground garages, bridges and ports [3,4]. The RC slab column structure may undergo punching shear at the slab column joints under bending and shear loads. Brittle punching shear failure of RC slabs is usually caused by high shear stresses around the slab–column joint [9]. Due to the mechanisms of brittle failure at slab–columns joints, it is easy to cause progressive collapse, which affects the integrity of the structures [10]. The mechanism of punching shear of slab–column structures is complex; the punching shear problem is still open for investigation
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