Two way slab
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This document discusses two-way slabs, which are supported on all four sides or at column centerlines. It describes two main types - edge supported slabs and column supported slabs. Edge supported slabs are suitable for spans of 20-30 feet and live loads of 60-120 psf. They have increased stiffness and low deflection. Column supported slabs include flat slabs and two-way ribbed/waffle slabs. Flat slabs have no beams or column capitals and are suitable for spans of 20-30 feet. Ribbed and waffle slabs have reduced dead load and architectural beauty, with spans of 30-48 feet and live loads of 60-120 psf. The document also discusses minimum
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Slab is a flat piece of concrete used as a walking surface or load bearing element. It can be supported by walls, beams, or columns. Slabs provide a flat surface and act as insulators while supporting loads. Slabs are classified as one-way, two-way, flat plate, or waffle depending on their reinforcement configuration and load distribution. One-way slabs are reinforced in one direction while two-way slabs carry load in two directions. Flat plate slabs do not use beams but instead rely on slab reinforcement to carry loads. Waffle slabs contain ribs to increase stiffness. Common slab issues include cracking from inadequate design or construction, and dampness from moisture penetration.
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This document discusses ductile detailing of reinforced concrete (RC) frames according to Indian standards. It explains that detailing involves translating the structural design into the final structure through reinforcement drawings. Good detailing ensures reinforcement and concrete interact efficiently. Key aspects of ductile detailing covered include requirements for beams, columns, and beam-column joints to improve ductility and seismic performance. Specific provisions are presented for longitudinal and shear reinforcement in beams and columns, as well as confining reinforcement and lap splices. The importance of cover and stirrup spacing is also discussed.
Slab_design_RCD_II_Lec_1_beam_column_arrangment.pptx
This document discusses the analysis and design of concrete floor systems. It begins with an overview of basic design steps for slabs, including recalling design procedures for shear and flexure. It then classifies different types of concrete floor systems such as one-way slabs, two-way slabs, flat plates, and joist systems. The document provides examples of analyzing and designing a one-way slab using the ACI approximate method and discussing the effect of beam spacing on slab moments. It concludes with references for further information.
Design of concrete Structure 2
The document discusses flat slab construction and design. It begins by defining a flat slab as a reinforced concrete slab without beams that transfers loads directly to supporting columns. It describes various types of flat slabs including simple flat slabs, those with drop panels or column heads, or both. The document outlines design considerations for flat slabs including analyzing column and middle strips, estimating depth, and calculating moments and shear. It also discusses advantages such as reduced height and construction time. In summary, the document provides information on flat slab types, design methodology, and benefits compared to other construction methods.
Deep beams
- Deep beams are defined as beams with a shear span to depth ratio of less than 2. They behave differently than ordinary beams due to two-dimensional loading and non-linear stress distributions.
- Deep beams transfer significant load through compression forces between the load and supports. Shear deformations are more prominent.
- Design of deep beams requires considering two-dimensional effects, non-linear stress distributions, and large shear deformations. Procedures include checking minimum thickness, designing for flexure and shear, and detailing reinforcement.
Design of flat plate slab and its Punching Shear Reinf.
This document provides design considerations and an example problem for designing a flat plate slab using the Direct Design Method (DDM). It discusses slab thickness, load calculations, moment distribution, and reinforcement design for a sample four-story building with 16'x20' panels supported by 12" square columns. The design of panel S-4 is shown in detail, calculating loads, moments, and reinforcement requirements for the column and middle strips in both the long and short directions.
one way slab 10.01.03.162
This document discusses the design of one-way slabs. It begins by defining one-way slabs as slabs that are supported on two opposite sides and carry loads in the perpendicular direction. The document then provides details on: the analysis of one-way slabs as series of 1-foot wide beam strips; typical reinforcement including main tension bars and shrinkage/temperature bars; minimum thickness requirements in the ACI code; and design procedures including selecting design strips, calculating loads, drawing shear and moment diagrams, and determining reinforcement ratios. Examples are provided for reinforcement spacing, minimum cover, and designing a one-way slab.
10.01.03.162
Ahsanullah University of Science and Technology
name :Mehrana Rashid Ananna
id:10.01.03.162
topic :one way slab
one way slab 10.01.03.162
ahsanullah university of science and technology
name :Mehrana Rashid Ananna
ID:10.01.03.162
topic:one way slab
section:c
4th year,2nd semester
One way slab design 10.01.03.162
Ahsanullah University Of Science &Technology
NAME:Mehrana Rashid Ananna
SEMESTER : 4/2
SECTION : C
I.D : 10.01.03.162
TOPIC : One-way slab design
Ahsanullah university ppt 1
This document discusses the design of two-way slabs. It defines a two-way slab as having a ratio of long to short spans less than 2, spanning in two directions. The types of two-way slabs described include flat slabs with drop panels, slabs with two-way beams, flat plates, and waffle slabs. The basic steps of two-way slab design are outlined, including choosing the slab type and thickness, the design method, calculating moments, determining reinforcement, and checking shear strength. Methods of determining maximum bending moments and slab reinforcement are also summarized.
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Two way slab
- 1. Dhaka university of engineering and technology, Gazipur TWO WAY SLAB Prepared by MD. AMINUL ISLAM(CE-32 MD. ABUHENA BASHIR(CE-32)
- 2. TWO WAY SLAB # Supported by beam in four side or coloumn centre line. # deflection = Dish shape. # L/B <2. # load transfer in both short and long direction. # carries more load than one way slab.
- 3. Types of two way slab Two types : 1.Edge supported 2.Coloumn supported
- 4. Edge supported slab: #suitable span 20 to 30 ft & live load 60 to 120 psf. #increase stifness #low deflection
- 5. Coloumn supported slab. Flat slab: a.suitable for span 20 to 30 ft, &load 80 to 150 psf
- 7. Coloumn supported slab • Flat plate floors: # flate ceiling. #no beams,coloumn capital . #low shear capacity ,low stifness. #fails on punching shear. #suitable for span 20 to 25 ft. & live load 60 to 100 psf.
- 8. Coloumn supported slab. Two way ribbed and waffle slab system: # L/B < 2 #slab thickness about 2 to 4 inch # rib spacing about 20 to 30 inch. #reduce dead load. #architectural beauty #suitable span 30 to 48 ft & live load 60 t0 120 psf.
- 10. In fig let us assume , it is consist of 2 sets of parallel strips , in each of 2 direction , intersecting each other.
- 12. Equating the center deflection of the short & the long strips gives Consequently ,
- 13. Minimum thickness • The equation of determinate thickness on the basis on αfm , αf = (Stiffness of beam/Stiffness of slab)
- 14. Minimum thickness (β= ln/ls ) • In Bangladesh usually used in 125mm slab thickness • According to B.N.B.C the minimum thickness of slab is 100mm
- 15. Minimum reinforcement • For two way slab rmin should not be less than temperature and shrinkage bar
- 16. Corner reinforcement Corner reinforcement are used in exterior corner of two way edge supported slab only In slabs which are restrained along the edges and are not free to lift, cracks as shown below get developed at the corners because of the high torsional moment. We need to prevent such types of crack formations in the slab and thus reinforce these sections by providing reinforcement. Spacing of corner reinforcement should be used same as minimum spacing of main bar.
- 17. Design methods of two way slab I. ACI co-efficient method II.Direct Shear design method III.Equivalent frame method IV.Strip method V.Yield line analysis method