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![Reinforcement in slab Punching Shear Slab [15]](profile/Ahmed-Sagban/publication/336748683/figure/fig9/AS:817235413184522@1571855514337/Figure-13-Reinforcement-in-slab-Punching-Shear-Slab-15.jpg)
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![Figure (5): Upper floor collapse of Wolverhampton parking (UK) [10] 2....](profile/Ahmed-Sagban/publication/336748683/figure/fig1/AS:817235413200896@1571855514091/Figure-5-Upper-floor-collapse-of-Wolverhampton-parking-UK-10-2-Failure-Mechanism_Q320.jpg)
![Figure (6): Mechanism of punching crack without shear reinforcement [11]](profile/Ahmed-Sagban/publication/336748683/figure/fig2/AS:817235413188609@1571855514118/Figure-6-Mechanism-of-punching-crack-without-shear-reinforcement-11_Q320.jpg)
![Figure (7): Critical circumference given in different codes [2] 3....](profile/Ahmed-Sagban/publication/336748683/figure/fig3/AS:817235413196800@1571855514144/Figure-7-Critical-circumference-given-in-different-codes-2-3-Computation-of-slab_Q320.jpg)
![Figure (8): Shear reinforcement rail studs [15]](profile/Ahmed-Sagban/publication/336748683/figure/fig4/AS:817235413184512@1571855514200/Figure-8-Shear-reinforcement-rail-studs-15_Q320.jpg)
![Figure (9): Cages of continuous stirrups [5]](profile/Ahmed-Sagban/publication/336748683/figure/fig5/AS:817235413196809@1571855514228/Figure-9-Cages-of-continuous-stirrups-5_Q320.jpg)
Flat slab system is a concrete plate propped on columns without the existence of beams. During the former century, flat slabs have been used widely in different building types. In general, flat slabs are made from brittle materials and also have a finite depth; thus, flat slabs may undergo to fail due to punching shear or high deflections. Therefor...
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Citations
... One of the first inventors of mushroom head structures was Claude A. P. Turner, who designed and built his first building in this technology in 1906 [2]. The earliest slab-column construction in Europe was built by Robert Maillart [3]. At the same time, Artur Ferdinandovitch Loleit carried out his work on the mushroom system [4]. ...
The proposition of a method to verify the punching resistance for very large supports based on the EN 1992-1-1 standard is described in this paper. The present standard guidelines for the calculation of the punching resistance for large supports are also summarised. The proposed direct method is compared with other standard methods using an example taken from design practice. This method consists of a direct check of the shear forces at specific locations of the control perimeter with the permissible shear force calculated from the EC2 standard. The method showed very good agreement with the experiment while remaining practical for applications. The method presented takes into account the actual distribution of shear forces in the vicinity of the support, taking into account the influence of non-uniform loads, irregular floor geometry, the concentration of internal forces at the corners of the support and the influence of the stiffness of the head used. The paper provides scientists, engineers, and designers new method (called the direct method) for estimation of the punching load-bearing capacity outside the shear cap.
... The punching shear capacity improved by 6% when the ratio of flexural reinforcement was increased to 20% from the control specimen. From a summary of the flat slab, the problem of punching shear and its reinforcement were studied by Saadoon et al. [8]. They concluded that with the use of swimmer bars, the capacity of the punching shear is likely to increase by 17% as compared with a flat slab that has punching reinforcement. ...
... 7. Specimens with steel fiber have a greater load capacity in the range from 1.1 to 1.26 than specimens without steel fiber. 8. In comparison to slab reinforced with plate or bar shear reinforcement in Abaqus, the slab with stirrups was weaker by a ratio 1.08-1.22 ...
This study demonstrates the behavior of a flat slab experimentally and numerically with two different types of shear reinforcements. Ten slabs were cast and tested in the experimental part. The samples were divided into two groups; the first consists of steel fiber, and the second has no steel fiber. Two control samples were considered with only flexural reinforcement, while the other eight samples had two types of shear reinforcement; the first was rebar to form a Y-shape, while the other was a steel plate formed as a Y-type perfobond. Shear reinforcement is provided by employing radial and parallel shear reinforcement. The tested samples in the experimental part have been simulated numerically using the Abaqus/CAE program. As a result of the laboratory examination, it was determined that the addition of steel fibers increased the ultimate load by (7.4% to 20.58%) for models with steel fibers compared to models without steel fibers. It was determined that the presence of steel plates in the models increased their capacity by 2.4% for ultimate load and by (6% to 50%) for deflection compared to ultimate load and deflection in models with steel bars. In Abaqus, the models with steel fibers were found to be 12.7%-26.6% stronger than those without them.
... Flate slabs are very important part of the structural elements, which also bear the loads that work on the building. Flat slab system is a concrete plate propped on columns without the existence of beams [2]. Flat slabs have several advantages such as a reduced and simpler formwork, versatility, and easier space partitioning, thus making them an economical and efficient structural system [3]. ...
Floor slabs are structural components of a building that have certain dimensions to transmit dead and live loads on them to be distributed to their supports. Designing the floor slabs of a building, load data will be borne by the structure, so that the planned structure is able to bear the loads and forces that work. With careful planning, it is expected that the dimensions and reinforcement of the floor slabs are economical and safe which can avoid deflection and cracks. The building being reviewed is hospitals in Surabaya. This building consists of 9 floors with a height of up to 37 m. Planning dimensions and reinforcement in this hospital building includes two-way slabs with different size variations. The analysis was carried out using the 'envelope method' in accordance with SNI 2847: 2013 (Basics of Reinforced Concrete Planning). The results of the analysis of dimensions and reinforcement in this hospital building are: a) the dimensions / thickness of the plate on the roof plate is 125 mm, while b) the reinforcement used on this floor plate is Ø10-125 and the reinforcement for Ø10-200. Each moment analyzed is contained in the analysis results table and floor slab reinforcement drawings.
... Finally, there are many kinds of improvement for the punching shear strength in the flat slabs. However, some of these methods need careful attention during the fabrication and installation, such as headed studs, stirrups, swimmer bars... etc. [22]. On the other hand, the manufacturing and installation of the Z-shape reinforcement, which has utilized in this study, is quite simple and cost a minimum budget particularly, when utilizing the available waste rebar in the construction site. ...
Currently, flat slabs become one of the widely used structures due to its architectural benefits such as uncomplicated formwork, flexibility and minimum construction time. However, these structures are relatively weak to resist the punching shear due to a considerable lowering in stiffness induced from the development of cracks that resulting from axial and seismic loads. Moreover, the punching failure is considered a brittle failure caused by the transferring of unbalanced moments and shear forces between the structural members. Unfortunately, this may cause a catastrophic collapse, especially in the region of the slab-column. Therefore, many experimental and theoretical studies were done to improve the punching strength of the flat slab. In the current work; a finite element three-dimensional non-linear analysis has simulated by ABAQUS tool to investigate the structural behaviour of flat slab. Two specimens have considered, the first is a flat slab reinforced by ordinary steel reinforcement. While in the second one, a Z-shape shear rebar improvement has been added to the slab-column connection. The proposed model has reflected a reasonable enhancement to the flat slab. The analysis considers different parameters such as punching shear forces, deformations, and stresses of Von-Mises. The outcomes indicate that punching shear strength is increased by approximately 11.1%, and the deflections are decreased by 77.3% when the Z-shape reinforcement is used. In the meantime, stress concentrations were reduced and move from the slab-column connection.
... Finally, there are many kinds of improvement for the punching shear strength in the flat slabs. However, some of these methods need careful attention during the fabrication and installation, such as headed studs, stirrups, swimmer bars... etc. [22]. On the other hand, the manufacturing and installation of the Z-shape reinforcement, which has utilized in this study, is quite simple and cost a minimum budget particularly, when utilizing the available waste rebar in the construction site. ...
Currently, flat slabs become one of the widely used structures due to its architectural benefits such as uncomplicated formwork, flexibility and minimum construction time. However, these structures are relatively weak to resist the punching shear due to a considerable lowering in stiffness induced from the development of cracks that resulting from axial and seismic loads. Moreover, the punching failure is considered a brittle failure caused by the transferring of unbalanced moments and shear forces between the structural members. Unfortunately, this may cause a catastrophic collapse, especially in the region of the slab-column. Therefore, many experimental and theoretical studies were done to improve the punching strength of the flat slab. In the current work; a finite element three-dimensional non-linear analysis has simulated by ABAQUS tool to investigate the structural behaviour of flat slab. Two specimens have considered, the first is a flat slab reinforced by ordinary steel reinforcement. While in the second one, a Z-shape shear rebar improvement has been added to the slab-column connection. The proposed model has reflected a reasonable enhancement to the flat slab. The analysis considers different parameters such as punching shear forces, deformations, and stresses of Von-Mises. The outcomes indicate that punching shear strength is increased by approximately 11.1%, and the deflections are decreased by 77.3% when the Z-shape reinforcement is used. In the meantime, stress concentrations were reduced and move from the slab-column connection.
Initially, the flat slab system was widely used in buildings at low risk of wind and earthquakes. However,
nowadays, by using high-strength concrete and steel, the flat slab building system has been widely applied
to high-rise buildings. The structural model that uses the flat slab system is a structural model without
beams, and there is a thickening at the head of the column called drop panels. As a result, all the load on
the floor slab will be distributed directly to the column. In this paper, the building structure with and
without drop panels is modeled using ETABS Nonlinear v.9.7.4 software. This paper aims to determine how
significant the contribution of drop panels, in this case, is the natural period of vibration of the structure.
The analysis of building structures with drop panels and without Drop panels using ETABS Nonlinear
v.9.7.4 software has been obtained. The analysis results show that the drop panel contributes 8.87%, in this
case, the natural period of vibration of the structure.
