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A platform for research: civil engineering, architecture and urbanism
CFRP laminate as punching shear reinforcement
Highlights Presentation of an innovative punching shear reinforcement made of CFRP. Experimental results compared to those from literature. A new CFRP punching shear reinforcement presented with good performance.
Abstract Punching shear strength is one of the main parameters in the design of reinforced concrete flat slabs not only for the brittle nature of punching shear failure but also because such failure may affect the whole structure through progressive collapse. Aiming to improve the slab-column connection performance, this paper introduces an innovative punching shear reinforcement model, consisting of carbon fiber reinforced polymer (CFRP) laminate, which can be installed after the flexural reinforcement is assembled. To evaluate the performance of this reinforcement, four two-way reinforced concrete square slabs were built (1,000 mm in length and 70 mm in thickness) and tested under symmetrical punching. One slab did not contain punching shear reinforcement for reference and three slabs had this reinforcement, with one or more carbon fiber layers. The experimental results were compared with others from the literature and to the estimates of ACI 318, EC2 and NBR 6118. This comparison clearly showed the good performance of the new punching shear reinforcement, which exhibited an increase in strength of up to 45% in comparison to the reference slab as well as an increase in ductility.
CFRP laminate as punching shear reinforcement
Highlights Presentation of an innovative punching shear reinforcement made of CFRP. Experimental results compared to those from literature. A new CFRP punching shear reinforcement presented with good performance.
Abstract Punching shear strength is one of the main parameters in the design of reinforced concrete flat slabs not only for the brittle nature of punching shear failure but also because such failure may affect the whole structure through progressive collapse. Aiming to improve the slab-column connection performance, this paper introduces an innovative punching shear reinforcement model, consisting of carbon fiber reinforced polymer (CFRP) laminate, which can be installed after the flexural reinforcement is assembled. To evaluate the performance of this reinforcement, four two-way reinforced concrete square slabs were built (1,000 mm in length and 70 mm in thickness) and tested under symmetrical punching. One slab did not contain punching shear reinforcement for reference and three slabs had this reinforcement, with one or more carbon fiber layers. The experimental results were compared with others from the literature and to the estimates of ACI 318, EC2 and NBR 6118. This comparison clearly showed the good performance of the new punching shear reinforcement, which exhibited an increase in strength of up to 45% in comparison to the reference slab as well as an increase in ductility.
CFRP laminate as punching shear reinforcement
Mota dos Santos Junior, Paulo Sergio (author) / Gonçalves Malcher da Silva, Andre (author) / Carvalho de Oliveira, Denio Ramam (author)
Engineering Structures ; 237
2021-02-12
Article (Journal)
Electronic Resource
English
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