2 edition of local strength of flat slabs at edge columns. found in the catalog.
local strength of flat slabs at edge columns.
Stephen George Gilbert
Written in English
Thesis (Ph.D.)--The Queen"s University of Belfast, 1979.
|The Physical Object|
This types of construction is aesthetically appealing also. These slabs which are directly supported by columns are called Flat Slabs. Fig. shows a typical flat slab. d 2 Critical section for shear Fig. A typical flat slab (without drop and column head) The column head is some times widened so as to reduce the punching shear in the slab. Strength of slab-column edge connections (Structural engineering mechanics and materials report) Unknown Binding – January 1, by Jack P Moehle (Author) › Visit Amazon's Jack P Moehle Page. Find all the books, read about the author, and more. Author: Jack P Moehle.
• Punching shear –e.g. flat slabs and pad foundations Shear There are three approaches to designing for shear: • When shear reinforcement is notrequired e.g. usually slabs • When shear reinforcement isrequired e.g. Beams, see Lecture 3 • Punching shear requirements e.g. flat slabs The maximum shear strength in the UK should not exceed. The simplest type of two-way slab to construct is known as a flat slabs are supported directly by the columns and have a completely flat soffit. For live loads of about 50 psf ( kPa), column spacing typically ranges from 15 to 25 ft ( to m) with mini-mum slab thicknesses of 6 to 10 in. ( to mm).1 For longer.
What is a Slab? Slabs are constructed to provide flat surfaces, usually horizontal in building floors, roofs, bridges, and other types of slab may be supported by walls or by reinforced concrete beams usually cast monolithically with the slab or by structural steel beams or by columns, or by the ground. The rupture is brittle and may occur clearly below the flexural capacity of the slab. This work aims to analyse the symmetric punching resistance of reinforced concrete flat slabs with shear reinforcement. Twelve mm thick slabs representing regions around columns, loaded at the centre and reacted at the edges, were tested up to failure.
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The local strength of flat slabs at edge columns. By S Gilbert. Abstract. SIGLEAvailable from British Library Document Supply Centre- DSC:D/81 / BLDSC - British Library Document Supply Local strength of flat slabs at edge columns.
book Kingdo Topics: 13M - Structural engineering Author: S Gilbert. The local strength of flat slabs at edge columns Author: Gilbert, S. ISNI: Awarding Body: Queen's University of Belfast Current Institution: Queen's University Belfast Date of Award: Availability of Full Text: Full text unavailable from EThOS.
Flat Slab/Edge Column Joints Figure 1 Edge Column Models S.G. Gilbert and A.E. Long (a) Floor Plan of Flat Slab Structure Free Edges ^Continuous Edges (b) Combination of T w o Half Edge Panels t o f o r m Model Shape LU c 2 / Columns Pinned at Mid Height Null Slope due to Model Symmentry c (c) 2 Section A A Null Slope With Edges Author: S.G.
Gilbert, A.E. Long. t = SF transferred from slab k = for internal column, corner columns and edge columns where M acts parallel to free edge and for edge columns where M acts at right angle to free edge 2. Determine v max= V eff /u od where u o is the length of column perimeter Check v ma.
Failure analysis of edge flat-slab column connections with shear reinforcement At beam-to-column tension connections by high strength bolts, the yield and maximum local strength of column.
Twenty slab specimens had been tested in the programme and it was found as expected that the stresses in the slabs are concentrated mostly around the shorter ends of the rectangular columns. Openings reduce punching strength considerably and the best place for an opening is along the longer side of the column.
Alternatively, for columns supported on four sides by beams or by slabs (i.e. for internal columns) “the strength of the column shall be based on an assumed concrete strength in the column joint equal to 75% of the column concrete strength plus 35% of floor concrete strength”. No guidance is given for edge and corner columns.
Modelling a flat-slab structure using FEM software is simple at first glance. However, one of the particularities that comes first when designing the slab is the concentration of internal forces in the slab directly above the column and taking into account the local strength of the slab at the column head.
For a general flat slab, when doing edge column design, would you just allow for nominal eccentricity of 20mm as per BS and use this moment. You want to design your columns and shear walls for strength but then also ensure the average stress is the similar.
I also recommend reading: Manual for the design of concrete building structures. The building shall have a central RC core and columns only around the edge of the floor plate. Thefloor plate is somewhat elliptical, whilst the core is circular.
The intention is to design the slab spanning between the perimeter columns and the central core walls as a FLAT SLAB. Keywords: Flat slab system, punching shear, edge slab-column connection, plastic damaged plasticity model, Abaqus.
Cite this Article T. Viswanathan, V. Sairam, K. Srinivasan and Giriraj Mannayee, Study on Edge Slab-Column Connection in Flat Slab, International Journal of Civil Engineering and Technology, 8(9),pp. 53– Edge (C2): V d ≈ kN (C4 and C6 are not governing V d ≈ kN) Control perimeter The effective depth d v is assumed to be mm.
Eccentricity coefficient (k e) are adopted from the commentary of § ⎜⎟ Inner column Corner Column Edge Column (C5) (C1, C3) (C2, C4, C6) k e= k e= k e= Inner: () 0 4 4 10 3. TRANSFER OF MOMENTS AT COLUMNS The analysis for punching shear in flat plates and flat slabs presented in Sec.
2 assumed that the shear force Vu was resisted by shearing stresses uniformly distributed around the perimeter bo of the critical section, a distance d/2 from the face of the supporting column.
The nominal shear strength Vc was given by Eqs. Dimension of the ZIP profile and the edge beam, Bakker (). /d on the punching shear strength of slab-column connections, from Sherif footing slabs to flat plate floors from a.
Flab slabs: Slabs of uniform thickness bending and reinforced in two directions and supported directly by columns without beams. Flat slabs with drop panel: Flat slab thickness at its column supports with column capitals or drop panels to increase strength and moment-resisting capacity.
Suitable for heavily loaded span. With Wisdom We Explore. assuming linear-elastic slab behavior) in a slab at a distance d/2 from the column edge for different column sizes and shapes.
Whereas the distribution can be assumed as uniform for small square columns (Fig. 2(a)) as well as for circular columns (Fig. 2(c)), higher stresses in column corners can.
strengthen and repair the flat slab-edge column connections subjected to punching shear. These systems is an exterior stirrups manufactured from glass, carbon fibers and steel links. Test results of thirteen half-scale specimens reinforced concrete flat slab-edge column connections were.
Monolithic slabs may also have thickened edges that provide a footing for structural loads from exterior load-bearing walls. The thickened edges may or may not be reinforced in standard residential practice. Slab-on-grade foundations are often placed on 2 to 3 inches of washed gravel or sand and a 6 mil ( inch) polyethylene vapor barrier.
TESTS ON SLABS IN THE VICINITY OF EDGE COLUMNS. Tests on 4 specimens of a flat-plate floor in the vicinity of an edge column are reported. The purpose of the tests was to study the influence of a spandrel beam and closed ties on the failure strength of the slab in the vicinity of an edge column.
If either the slab edge is sloping or a column local axis is rotated it is possible to get a corner shear perimeter. The program will start by trying to draw the full shear perimeter. When this happens in this case we find that the shear perimeter has two parts of it that run into a slab edge.
When this occurs the program considers this a corner. Thirteen tests were carried out to investigate the effect of outwards eccentricity on the punching resistance of flat slab edge column connections. The slabs measured x mm ( x in.) on plan and were mm ( in.) thick.
One end of the slab was supported on a mm ( in.) square column with a boot at its base for.Selected experimental data on the strength of slab-column edge connections transferring moment perpendicular to the edge are reviewed. The eccentric shear stress model that forms the basis of design according to the ACI Building Code (ACI ) is found to not correlate well with the data.
Highlights The need for punching shear strengthening of existing flat slabs has greatly increased. Over 40 analytical punching shear models were analyzed and classified. Available models cannot reproduce specific problems inherent to strengthening.
Typical problems include pre-damage and insufficient anchorage of reinforcement. Local prestressing around the column constitutes a .