Punching Shear Strengthening of Reinforced Concrete Flat Plates Using Carbon Fiber Reinforced Polymers

Binici, Barış; Bayrak, Oguzhan

doi:10.1061/(asce)0733-9445(2003)129:9(1173)

Cited by 57 publications

(30 citation statements)

References 3 publications

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“…This was primarily intended to increase the flexural stiffness and strength of the slabs, which would also indirectly enhance the punching shear strength. On the other hand, Binici and Bayrak (2003), Sissakis and Sheikh (2007), Erdogan et al (2010) and Widianto et al (2010) concentrated on the application of FRP material as vertical shear reinforcement through the depth of slab in the critical punching region.…”

Section: Introductionmentioning

confidence: 99%

Effect of column rectangularity on CFRP-strengthened RC flat plates

Erdoğan

Binici

Özcebe

2011

Magazine of Concrete Research

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This study presents experimental and analytical research that focused on the behaviour of carbon-fibre-reinforced polymer (CFRP)-strengthened flat-slab specimens for punching shear enhancement. Seven 0 . 75-scale flat-slab specimens representing interior slab-column connections with different column aspect ratios varying from 1 to 3 were tested. The results revealed that increasing column rectangularity had a detrimental effect on column punching strength of all specimens. A strength increase of at least 30% was obtained for the CFRP retrofitted specimens compared with the companion reference specimen. Three-dimensional finite-element models were successful in providing reasonable estimates of load-deformation behaviour and strains. Based on these results, CFRP strains at failure and the punching failure mechanism are discussed.

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Section: Introductionmentioning

confidence: 99%

Effect of column rectangularity on CFRP-strengthened RC flat plates

Erdoğan

Binici

Özcebe

2011

Magazine of Concrete Research

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“…There are 28 slabs essayed by Sissakis (2002) [1] and 11, by Binici (2003) [14]. In relation to the test scheme, all the slabs subject to symmetric loading, which simulates the situation of building internal columns, without the action of flexural moments.…”

Section: Analysis Of the Code Provisionsmentioning

confidence: 99%

Sistema de reforço à punção de lajes lisas de concreto armado com polímeros reforçados com fibra de carbono (PRFC)

Santos

Nicácio

Lima

et al. 2014

Rev. IBRACON Estrut. Mater.

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This research evaluates the behavior of slab-column connections in a reinforced concrete flat slab system and subjected to symmetrical loading, strengthened to the shear with carbon fiber reinforced polymer (CFRP). The strengthening method consists in applying CFRP sheets as shear resistant element, by bonding it through perpendicular holes to the plane of the slab. As the current standards do not deal with strengthening to shear with CFRP reinforcement, it was assessed the application of the code's required from by ACI 318 (2011) Abstract Resumo IntroductionUncertainties regarding structural safety -like suspicions of project and execution error, doubts about the stability due to apparently pathological demonstrations and changes of service loads -are situations that justify an intervention with the strengthening of a structure. For the case of punching in a slab-column connection, some constructive systems which make possible this strengthening with improvement. However, these systems are invasive and, usually, imposes changes of the structure geometry. The use of carbon fiber reinforced polymer sheets (CFRP) as an alternative for the increase of the load bearing capacity of flat slabs is a simple and fast intervention, which efficiency has been proved by experimental research in the last years. The main idea of strengthening method is to install CFRP as a member resistant to shearing. The application occurs by bonding the CFRP sheets through perpendicular holes to the plane of the slab. It is necessary to pay attention to the requirements of the sheet anchorage and for the later filling of the holes with resistance grout and elasticity modulus compatible with the ones from the substratum. There are not regulations specifically dealing with the use of CFRP as slab punching reinforcement. Then, the objective of this research is to evaluate the safety, economy and the accuracy of the application of some of the main project regulations in the slab punching resistance in reinforced concrete strengthened to punching with CFRP. (2002) [1] will be adopted so that these regulations can be used in the case studied, with CFRP reinforcement, in which the deformation limits of ACI 440.2R is considered. This last code deals only with the strengthening of reinforced concrete structures using fiber-reinforced polymers. From the calculation results, will be evaluated the dispersion and the conservatism level of each case. JustificationThe study of strengthening to flat slab punching is justified by the progressive use of this structural system, combined with the dangerous awareness of a ruin by shear. The common strengthening to punching techniques, basically, consist in the use of capitals (made of concrete or metal) in the strengthening of a flexure reinforcement or in the posterior introduction of a shear reinforcement composed by steel bolts. The additional resistance provided by the posterior fastening of steel bolts in the critical shear area is an alternative that rules out the possibility of part geometry change. Ho...

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“…The disadvantage of the flat plate slab system 1-3 is the vulnerability of punching shear failure. [4][5][6][7] The punching shear at the slab-column connection is related to the size of columns, the span of the slab, the compressive strength of concrete and so on. To enhance the punching shear resistance capacity [8][9][10] at the slab-column connection, researchers have studied various types of shear reinforcing methods.…”

Section: Purpose Of Researchmentioning

confidence: 99%

“…V sp is shear contribution of the steel plate, A sp is area of the steel plate on one side of column, f yp is yield strength of the steel plate and AE is shear reduction coefficient of the steel plate. Experimental and predicted punching shear strength of test specimens based on ACI 318-02 are presented in Table 4 using Equation 4. Shear distribution, which the steel plate contributes to specimens SSP-5 and SSP-6 according to the analysis of specimens SR-i and SSP-i, is respectively 21 kN and 28 kN, which is 10% of the shear distribution of the studs.…”

Section: Stud Strainsmentioning

confidence: 99%

Punching shear reinforcing using studs with steel plates in reinforced concrete flat plates

Cho

Noh

Kim

2009

Magazine of Concrete Research

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Flat plate structures of reinforced concrete buildings have many advantages. However, a drawback of flat structures is that they are vulnerable to punching shear failure at the column-slab connections. This study proposes a new novel technique to improve the punching shear resistance capacity in new flat plate structures using the studs with perforated steel plate reinforcement at column-slab connections. Tests were carried out on specimens of 3 4 scale, which were designed to fail as a result of punching shear. The specimen variables were as follows: the first case used a stud rail and a base specimen; the second case used four stud specimens with perforated steel plates with different lengths; and the third case used a perforated steel plate with the same length as the stud with the steel plate. From the test results, the following conclusions were drawn: (a) the ultimate strengths of specimens have been designed to resist punching shear based on ACI 421 and Eurocode 2-04, and shear reinforcement for slabs has been compared with the results from the structural experiments; (b) the studs contributed substantially to the increase of ultimate strength; (c) the studs with steel plates contributed to the increase of the ultimate strength. The ratio of ductility in the specimen was larger than that of the total increase in strength.

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Punching Shear Strengthening of Reinforced Concrete Flat Plates Using Carbon Fiber Reinforced Polymers

Cited by 57 publications

References 3 publications

Effect of column rectangularity on CFRP-strengthened RC flat plates

Effect of column rectangularity on CFRP-strengthened RC flat plates

Sistema de reforço à punção de lajes lisas de concreto armado com polímeros reforçados com fibra de carbono (PRFC)

Punching shear reinforcing using studs with steel plates in reinforced concrete flat plates

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