Punching strengthening of two-way slabs using external steel plates

Elbakry, Hazem M.F.; Allam, Said M.

doi:10.1016/j.aej.2015.09.005

Cited by 24 publications

(8 citation statements)

References 7 publications

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“…For a flexural reinforcement ratio of 1.0 percent, the punching shear capacity increased by approximately 42 percent, and the deformation capacities increased by approximately 15 percent. Elbakry and Allam [13], used the external steel plates to provide experimental and analytical studies to enhance the punching shear of reinforced concrete slabs. Five specimens of slabs (1200×1200×100)mm with concrete reinforced was investigated.…”

Section: Column Capital or Steel Platementioning

confidence: 99%

Enhancing punching shear capacity of flat slab: review of strengthening and repairing techniques

Abed Al-jabar,

Kadhim

2023

IOP Conf. Ser.: Earth Environ. Sci.

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A significant number of concrete flat slabs need to be strengthened against brittle punching shear failure due to conversion of existing buildings, material deterioration, the growth of standards, and detailed defects. Furthermore, there are some traditional approaches to strengthen and repair reinforced concrete slabs which can be either cumbersome or expensive. The repairing of the slabs is very important and not optional because, they will be lost without repairing and reconstruction may not be appropriate due to lack of time or other exceptional circumstances. There were many techniques to strengthening and repair the flat slab depend on suitable way and material availability for strengthening like CFRP sheets, TRM jackets, steel stiffeners, steel bolts, column capital, increasing slab thickness and many other techniques. Typically, the strengthening enhanced punching shear capacity, and the increment may reach 90%. Repair specimens’ punching shear capacity, which may be more than that of the control specimen and the repairing techniques can be used for strengthening. From presented studies, it was found that using the same technique for strengthening and repairing gave better results in strengthening, so strengthening slabs before damages occur is important and enhances resistance better.

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Section: Column Capital or Steel Platementioning

confidence: 99%

Enhancing punching shear capacity of flat slab: review of strengthening and repairing techniques

Abed Al-jabar,

Kadhim

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Pilakoutas and Li [34] presented an undulating-steel-band type of reinforcement. Dam and Wight [35] and Elbarkry and Allam [36] highlight the effectiveness of different bolt layouts in rails and plates.…”

Section: Still Other Authors Have Compared Their Experimental and Anamentioning

confidence: 99%

Parametric finite element analysis of punching shear behaviour of RC slabs reinforced with bolts

Navarro

Ivorra

Varona

2020

Computers & Structures

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Reinforced concrete slabs are an essential part of high-rise structures and are designed to withstand the loads to which they are subjected. However, concrete slabs may fail due to punching shear, which is one of the greatest risks they face. This type of failure, hard to predict, befalls almost instantaneously and may lead to catastrophic consequences. In this paper, we analyse a series of non-linear numerical models ─using ABAQUS─ simulating the punching shear effect on a flat, reinforced concrete slab retrofitted with bolts arranged in three different positions around the support. As starting point, we carried out an initial calibration of the Finite Element Model (FEM) using Adetifa and Polak's experimental results. We then performed a parametric analysis to determine the influence of the geometrical parameters of the retrofitting. For this purpose, we created over two hundred models with the help of an automation algorithm programmed in Python. Our results effectively predict the precise distribution of the retrofitting bolts that will successfully increase the punching shear strength.

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“…Over years, various enhancement/strengthening techniques have been developed in order to improve the punching shear resistance for RC flat slabs. These techniques include using traditional shear reinforcement in the form of single- and multiple-leg stirrups, swimmer shear bars, bent-up bars, inclined stirrups, inclined shear band reinforcement, post-installed reinforcement, steel links, external steel plates with steel anchor shear studs, steel shear head, shear stud with single or double head, helical reinforcement, external carbon fiber reinforced polymer (CFRP)/glass fiber reinforced polymer (GFRP) stirrups/rods or externally bonded (EB) CFRP/GFRP laminates/strips, and mesh reinforcement (ACI 318-14, 2014; Al-Nasra et al, 2013; Bartolac et al, 2015; Binici and Bayrak, 2003, 2005a, 2005b; Chen and Li, 2005; Corely and Hawkins, 1968; Durucan and Anil, 2015; Elbakry and Allam, 2015; Esfahani et al, 2009; Faria et al, 2014; Ferreira et al, 2014; Harajli and Soudki, 2003; Kang and Wallace, 2005; Khaleel et al, 2013; Meisami et al, 2013; Najmi and Marahlah, 2015; Oliveira et al, 2000; Park et al, 2007, 2012; Pilakoutas and Li, 2003; Ruiz et al, 2010; Sissakis and Sheikh, 2007; Soudki et al, 2012; Tassinari et al, 2011). Providing internal short steel/fabric fibers into the entire slab or a partial area near the slab–column connection is another technique used for enhancing the behavior of the cracked tension region as well as the undamaged concrete in the compression zone (Cheng and Parra-Montesinos, 2010; Choi et al, 2007, 2012; El-Ghandour et al, 2003; Harajli et al, 1995; Hassan et al, 2015; Ju et al, 2015; Mandl, 2008; Tan and Paramasivam, 1994).…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the provided EB-CFRP in most researches (Chen and Li, 2005; Harajli and Soudki, 2003; Sissakis and Sheikh, 2007) had not been anchored properly leading to debonding failure of the used EB-CFRP sheets. Other researchers (Elbakry and Allam, 2015) used EB solid steel plates without internal opening to accommodate the column reinforcement for real situations. In addition, enhancing the concrete strength in the joint can improve the punching shear resistance of the slab.…”

Section: Introductionmentioning

confidence: 99%

Punching shear resistance of strengthened reinforced concrete interior slab–column connections using ultra-high-performance strain-hardening cementitious composite material

Afefy

El-Tony

2019

Advances in Structural Engineering

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The main target of this article is to find out the most applicable strengthening technique to change the brittle punching shear failure of slab–column connection to a ductile one. The considered strengthening technique uses the combined effect of the internal single-leg stirrups and a thin layer of ultra-high-performance strain hardening cementitious composite material provided in either tension or compression side. Thus, 12 slab specimens divided into four groups were prepared and configured. It was found that the slab provided with properly anchored single-leg stirrups with a cross-shaped thin layer of ultra-high-performance strain hardening cementitious composite material at the compression side proved the most efficient technique among all the considered configurations. This technique enabled the slab to sustain a punching load of about 2.38 times that of the control unstrengthened slab. In addition, it exhibited ductile failure showing strain hardening and softening plateaus. Finally, the experimental shear resistances of all the strengthened slabs were compared against the design resistances stipulated by different design standards such as the ECP 203-2007, ACI 318-14, DIN 1045-1, and EC2-2004 codes. It can be concluded that the failure characteristics stipulated by the DIN 1045-1 code showed the most rational results compared with those of the experimental findings.

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Punching strengthening of two-way slabs using external steel plates

Cited by 24 publications

References 7 publications

Enhancing punching shear capacity of flat slab: review of strengthening and repairing techniques

Enhancing punching shear capacity of flat slab: review of strengthening and repairing techniques

Parametric finite element analysis of punching shear behaviour of RC slabs reinforced with bolts

Punching shear resistance of strengthened reinforced concrete interior slab–column connections using ultra-high-performance strain-hardening cementitious composite material

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