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Monday, May 4, 2020 | History

2 edition of investigation on the effectiveness of shear reinforcement in column flat slab connections. found in the catalog.

investigation on the effectiveness of shear reinforcement in column flat slab connections.

Carl E. Mickelson

investigation on the effectiveness of shear reinforcement in column flat slab connections.

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  • 34 Currently reading

Published in [Winnipeg?] .
Written in English

    Subjects:
  • Reinforced concrete -- Testing,
  • Reinforced concrete construction

  • The Physical Object
    Paginationviii, 66 leaves.
    Number of Pages66
    ID Numbers
    Open LibraryOL18853750M

    causes shear forces at the flat plate-column connections. Due to transfer of shear forces combined with induced unbalanced moments between slab and column, brittle punching failure can occur. Because of increase in applied loads and/or lack of consideration of seismic effects. punching reinforcement but in combination with other punching shear reinforcement systems or as integrity reinforcement if no punching shear reinforcement is used. The objective in both cases is not only to increase the deformation capacity of the slab but also to reduce the risk of a brittle failure of the slab-column connection (Fig 1). Even. way shear in beams is most often studied on small, heavily reinforced, slender beams, tested in four point bending [1, 2], resulting in the semi-empirical expressions as given in NEN-EN [3] and ACI [4] for the beam shear capacity. Two-way shear in slabs is studied on slab-column specimens [5].File Size: KB.


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investigation on the effectiveness of shear reinforcement in column flat slab connections. by Carl E. Mickelson Download PDF EPUB FB2

Four reinforced concrete slab-column subassemblies were subjected to a high intensity shear and moment transfer at the column-slab connection. The subassemblies consisted of an exterior and an interior panel extending laterally to the ten ter lines between the columns and the framing-in columns above and below, and were cast at one-third by: 6.

in slab-column region. Also, it is found that, the use of NSM CFRP bars is an effective technique to enhance shear capacity of SCC slab-column models and nearly provided the same efficiency of internal reinforcement.

Even efficient to increase the punching shear. The simple definition of Shear Reinforcement is: reinforcement which is designed to resist shear or diagonal tension stresses. * Shear reinforcement is usually provided in the form of stirrups to hold the longitudinal reinforcement and also to ta.

A slab-column connection is susceptible to brittle punching shear failure, which may result in the necessity of shear reinforcement. In the present study, a new type of shear reinforcement using. Request PDF | Numerical Investigation on the Effectiveness of a Novel Flat Truss Shape Punching Shear Reinforcement | This research aims to gain understanding of the effectiveness of a novel flat.

The numerical investigation investigation on the effectiveness of shear reinforcement in column flat slab connections. book the accuracy and effectiveness of the LFEM in predicting the strength of column?slab connections with words: column?slab connection, concrete flat plate, punching shear, stud shear reinforcement, finite element analysis.

View less >Cited by: 9. 1 Abstract: The design of a flat plate structure is generally governed either by serviceability limits on deflection or punching shear strength of the column-slab connections.

To increase the strength of a column-slab connection, a new type of shear reinforcement, referred to as shear. shear reinforcement should be allowed only when the maxi-mum shear stress is checked as discussed as follows.

Figures 1 and 3 show that the curves that represent exper-iments of slab-column connections with shear reinforcement fall well above the horizontal lines.

Although Curves 2 and 3 of Fig. 1 are not accurate because of the scatter of the ex. In flat-plate floors, slab-column connections are subjected to high shear stresses produced by the transfer of axial loads and bending moments between slab and columns.

Section of ACI allows the use of shear reinforcement for slabs and footings in the form of bars, as in the vertical legs of Size: KB. The unified strength theory (UST) is adopted as the failure criterion for the analysis of punching shear failure of slab-column connections.

Employing the layered finite element method, both material and geometry nonlinearities are considered in the analysis. An investigation is carried out on reinforced concrete beams and slab-column by: 6.

Shear reinforcement is usually not required in slabs supported on beams or walls because the depth is small and the span therefore fairly slender so bending and deflection will nearly always govern the design.

Most of the slabs are subject. title = "Punching shear resistance of flat slabs: Influence of reinforcement type and ratio", abstract = "As a part of a research program to study the performance and design of flat-slab systems, this investigation aimed to determine the effect of shear reinforcement type and ratio on punching shear strength of monolithic slab-to-column Cited by: Punching shear analysis of slab-column connections Carlos L.

Moreno Laboratory for the Concrete Technology and Structural Behaviour (LABEST) and Applied Mechanics Department, School of Technology and Management, Polytechnic Institute of Braganc¸a, Braganc¸a, Portugal, File Size: KB.

Punching shear strength in reinforced concrete slabs subjected to concentrated loads has received a lot of emphasis due to its importance in flat slab floor systems.Due to its brittle nature, shear failure at slab-column connection may have disastrous by: 8.

either method often leads to the use of shear reinforcement in connections of slab-column frames located in earthquake-prone regions. Although several types of shear reinforcement in slab-column connections have been investigated, such as bent-up bars, shearheads, and hoops (refer to, for example, Elstner and.

presence of columns. One of the main problems of flat slabs is its punching shear capacity at slab-column connection, which is subjected to a very complex triaxial stress state. Punching failure is characterized by the development of a truncated cone shaped surface at the slab-column connection.

Asw = area of shear reinforcement in each perimeter around the col. sr = radial spacing of layers of shear reinforcement α = angle between the shear reinforcement and the plane of slab fywd,ef = effective design strength of the punching shear reinforcement, = + d ≤ fywd (MPa.) d = mean effective depth of the slabs (mm) V v v u d Ed.

Lattice shear reinforcement increased the unbalanced moment-carrying capacity of the slab-column connections by more than times that of the specimens without shear reinforcement. All shear reinforcement methods significantly improved the. The use of shear reinforcement in the form of Shear Bolts is a new approach to strengthening slab-column connections.

Reported in this thesis are the results of research on the use of shear bolts for reinforced concrete interior slab-column connections without unbalanced : Bamidele Adetifa.

Carl E. Mickelson has written: 'An investigation on the effectiveness of shear reinforcement in column flat slab connections' -- subject(s): Reinforced concrete, Testing, Reinforced concrete. Reinforced concrete slab-column structures are widely used because of their practicality.

However, this type of structures can be subject to punching-shear failure in the slab-column connections. Without shear reinforcement, the slab-column connection can undergo brittle punching failure.

behaviour of slab-column connections under high gravity shear ratio. A half-scale reinforced concrete slab-column connection with shear reinforcement was modelled in finite element (FE) tool called ABAQUS.

The specimen was subjected to combined constant gravity and reversed cyclic lateral load. column head; 2- Providing shear reinforcement. Sometimes, after the construction of some building, the increase of punching shear resistance for reinforced concrete slab-column connection may be needed. The strengthening of slab-column connection against punching shear resistance by using traditional methods (steel plates, steel stirrups, steel.

The experimental program was consisted of testing, until seven slabs were ruptured (L1 to L7) aiming to experimentally investigate the behavior of slab-column connections in inner regions of flat slabs with one or two adjacent column openings, and with or without flexural moment transfer of the slab to the column.

effectiveness of steel fiber reinforcement for increasing punching shear strength and ductility in slabs subjected to monotonically increased concentrated load are presented. Ten slab-column connections were tested to failure.

The main test parameters evaluated were: Cited by: flat slab design is the slab-column connection, i.e., the shear force in the slab at the connection, which should retain its bearing capacity even at maximal displacements. The behaviour of flat slab building during earthquake depends mainly on îBuilding Configuration.

Safety is predominant during earthquake. This research is an experimental study on full-scale interior slab-column connections of flat-plate. Three types of shear reinforcements were proposed to prevent brittle punching shear failure that could result in collapse of whole flat plate structures.

A series of four flat plate specimens including a specimen without shear reinforcement and three specimens with the reinforcements was : Hyun Ki Choi, J.S. Kim, E.S. Jin, Chang Sik Choi. SHEAR REINFORCEMENT IN SLAB-COLUMN CONNECTIONS Bent-up bars Generally, bent-up bars, as shown in Fig.

are ° inclined bars that are used to resist tension in the bottom of the beam near mid-span. They may modestly improve the ultimate punching shear resistance of slab-column connections when they are well anchored (Hawkins.

Shear Reinforcements in the Reinforced Concrete Beams Moayyad M. Al-Nasra1, the effectiveness of shear reinforcement, and determining the optimum amount of both types of shear reinforcement to achieve a shear capacity similar to that of a normal links system.

From experimental investigation of the system it was found that, the use of Cited by: 5. /cconc cconc Thomas Telford Publishing /rarocs Repair and Renovation of Concrete Structures Repair and Renovation of Concrete Structures Proceedings of the International Conference held at the University of Dundee, Scotland, UK on 5–6 My Ravindra K.

DhirDirector, M. Roderick JonesAssociate Director, and Li ZhengResearch/Teaching Fellow. As a result, the use of slab shear reinforcement has emerged as a practical strategy to improve both the strength and ductility of reinforced concrete flat slabs. The primary objective of this research study was to investigate the behavior of reinforced concrete slab-column connections employing a novel shear reinforcement system consisting of Author: Mario Glikman.

According to ACI [7] the punching resistance of reinforced concrete flat slabs without shear reinforcement should be verified by checking the shear stresses in a control perimeter d/2 away from the column faces or the ends of the loaded area, as shown in Figure 7a.

The punching strength can be computed using Equation 1. The Behavior of Slab-Column Connections with Modified Shear Reinforcement under Cyclic Load Generally, slab-column frames show lower stiffness, drift capacity, and.

Strengthening of Flat Slabs Against Punching Shear Using Post-Installed Shear Reinforcement by Miguel Fernández Ruiz, Aurelio Muttoni, and Jakob Kunz Fig.

1—Collapse of parking garage flat slab at Gretzenbach (Switzerland, ): (a) view of flat slab after collapse (with ground cover, columns indicated inside circles); and. significant shear stresses that causes slab column connections to brittle punching shear failure. Flat slabs are catastrophic to punching shear because of absence of beam.

For enhancing the effect of punching shear either we have to increase the thickness of slab or optimizing the thickness by designing punching shear reinforcement. rior slab-column connections without shear reinforcement.

The punching shear was assumed to be resisted mainly by the compression zone at the critical section, addressing the damage due to flexural cracking at slab-column connections by flexural cracking In defining the punching shear strength, the material failure criteria of concrete was used.

Punching shear failure of flat concrete slabs is a complex phenomenon with brittle failure mode, meaning sudden structural failure and rapid decrease of load carrying capacity.

Due to these reasons, the application of appropriate punching shear reinforcement in the slabs could be essential. To obtain the required structural strength and performance in slab-column junctions, the effect of the Author: Kálmán Koris, András Kozma, István Bódi.

slab-column connections. The study focuses on the influence of varying the size of the supported area and the slenderness of the slab. Other investigated parameters are the flexural reinforce-ment ratio and the presence of shear reinforcement. The results of the File Size: KB.

An Investigation of the Shear Design of a Reinforced Concrete Box Structure by Sasha Kuzmanovic Graduate Department of Civil Engineering University of Toronto Recent research has show that size effects reduce the shear strength of large beams with no shear reinforcement and with low amounts of tlexural by: 6.

The test results show that two-way shear strength was sensitive to the slab top reinforcement ratio within the (c+3h) region, where c is the column dimension and h is the slab thickness.

The damage induced by lateral displacement cycles up to % lateral drift did not affect the punching shear capacity of the specimens tested.

NUMERICAL INVESTIGATION ON THE PUNCHING BEHAVIOR OF RC FLAT SLABS STRENGTHENING BY TRM AND FRP “Rehabilitation of Reinforced Concrete Slab-column Connections for Two-way Shear,” p.[6] M.

M. G. Inácio, A. Pinho Ramos, and D. M. V. Faria, “Strengthening of flat slabs with transverse reinforcement by introduction of steel.A method for punching shear design of slab- column connections, subjected to seismic loading, was proposed [5]. The punching shear design considers the probable unbalanced bending moment in the connection, promoting possibility of flexural failure mode over a shear one.

A modified yield line approach was presented. The predictions of.requirement of inches), % slab top reinforcement in the column strip and % reinforcement elsewhere. No shear reinforcement was used in the slab.

SP-Control 3, whose top reinforcement ratio is about the same as that in the flat-plate structures designed using ACIserved as a basis for comparing the strengthened specimens.