In a one-way slab, the main reinforcement is provided in a short span and distribution reinforcement is provided in a long span. In a two-way slab, the main reinforcement is provided in both directions. 3. In a one-way slab, the crank is provided in two directions.
What is the difference between a one way slab and a two way slab?
The one–way slab is supported by a beam on two opposite side only. The two–way slab is supported by the beam on all four sides. In one–way slab, the load is carried in one direction perpendicular to the supporting beam. In two–way slab, the load is carried in both directions.
What is a 2 way slab?
The two-way slab is a slab which is generally supported on all sides of walls or beams, and whose length to breadth ratio is less than two and it twists or bends in both direction while transferring the loads to the walls or beams.
What is a 1 way slab?
The one-way slab is a slab, which is supported by parallel walls or beams, and whose length to breadth ratio is equal to or greater than two and it bends in only one direction (spanning direction) while it is transferring the loads to the two supporting walls or beams, because of its geometry.How prestressed concrete is different from RCC?
Prestressed concrete sections are thinner and lighter than RCC sections, since high strength concrete and steel are used prestressed concrete. In prestressed concrete, whole concrete area is effective in resisting loads, unlike RCC where concrete below the neutral axis is neglected.
What is distribution steel?
Distribution steel is mainly provided on the top of the main bar, hence placed in longer span direction. The main purpose of providing distribution steel are used to hold the slabs on either way and to resist the cracks and shear stress developed at the top.
What is 2 way reinforced concrete slab?
What Is Two Way Slab? When a reinforced concrete slab is supported by beams on all the four sides and the loads are carried by the supports along with both directions, it is known as two way slab. In two way slab, the ratio of longer span (l) to shorter span (b) is less than 2.
What is PSC pipe?
Prestressed Concrete Pipes (P.S.C Pipes) are the pressure pipes, used in : Pressure Water Transmission and Distribution Main (Pumping & Gravity) for water supply, Drainage, Lift Irrigation Schemes. Re-Circulation and cooling water pipe lines. For plants like Thermal Power, Chemical, Fertilizer, Paper, Refineries etc.What is prestressing steel?
The overall reason to pre-stress steel is that it raises both the quality and the resistance to tension and compression characteristics of the steel. … Unlike reinforced concrete, stressed steel is a material which has high resistance both to tension and to compression.
Which direction in one way slab the main reinforcement is provided?The one-way slab will bend in one direction only i.e. in the direction along its shorter span. Therefore, main reinforcement (cranked bar) is provided along the shorter span and distribution reinforcement (straight bars) in a longer span.
Article first time published onWhat is LX and LY in slab?
We (civil engineers) actually denote the horizontal direction as Lx ( length of the steel in shorter span) and vertical as Ly (length of the steel in longer span) Mostly shorter span(Lx) comes first from the bottom of the slab.
What is top and bottom reinforcement?
TOP Bar : Top bar acts as reinforcement which provides strength against flexular moment. It also act reinforcement for compression load which is induced on the top side of beam. Bottom bar : Bottom bar provide strength for tensile load that is induced in lower portion of beam.
Which is main bar in one way slab?
2. Stronger dimension bar is used as main bar. In one way slab, the slab is supported by beams on the two opposite sides where main reinforcement bar is provided. In two way slab, the slab is supported by beams on all four sides.
What is difference between main steel and distribution steel?
Main Reinforcement Bars are used to transfer the bending moment developed at the bottom of the slab. Distribution Bars are used to hold the slabs on either way and to resist the cracks and shear stress developed at the top.
What is creep of concrete?
Concrete creep is defined as: deformation of structure under sustained load. Basically as long term pressure or stress on concrete can make it change shape. This deformation usually occurs in the direction the force is being applied. Like a concrete column getting more compressed, or a beam bending.
Why is rebar called rebar?
Rebar (short for reinforcing bar), known when massed as reinforcing steel or reinforcement steel, is a steel bar or mesh of steel wires used as a tension device in reinforced concrete and reinforced masonry structures to strengthen and aid the concrete under tension.
What is a PT beam?
Post-tensioned (PT) slabs are typically flat slabs, band beam and slabs or ribbed slabs. … Post-tensioned slabs use high-strength tensioned steel strands to compress the slabs, keeping the majority of the concrete in compression.
What are RCC pipes?
Reinforced concrete (RCC) Pipes are manufactured by centrifugal spinning process in which mechanical mixer concrete and reinforcement cage extended throughout the pipes barrel are used. The reinforcement cage for precast concrete pipes consist of spirals or circular rings and straights of mild steel wire.
What is Bwsc pipe?
Get Latest Price. The BWSC (Concrete Cylinder) Pipe. This Cylinder Pipe is essentially a thin steel pipe cylinder; Welded with thicker steel joint rings at the ends, hydraulically tested and centrifugally lined with cement mortar.
What is the meaning of DI pipe?
Ductile iron pipe is pipe made of ductile cast iron commonly used for potable water transmission and distribution. This type of pipe is a direct development of earlier cast iron pipe, which it has superseded. … Typically, the pipe is manufactured using centrifugal casting in metal or resin lined moulds.
What is the direction of yield line in one way slab?
In a one-way slab, the direction of yield line is perpendicular to the direction of steel. But in a two-way rectangular slab, the direction of yield lines may not be perpendicular to the direction of reinforcement. A two-way slab can be supported on all of its edges or any three of its edges.
How is one way slab calculated?
- Given data: Length = 5 m (5000 mm) …
- Solution: The quantity is done into two steps. …
- Formula: = (Total length – clear cover)/center to center spacing + 1.
- Main bar: = (5000 – (25+25))/100 + 1. …
- Distribution bar: = (2000 – ( 25 + 25))/125 + 1. …
- Cutting Length. …
- Cutting Length: …
- Distribution Bar:
What is the effective depth of slab?
Effective Depth (d) – The effective depth (d) of a reinforced concrete floor slab is the distance from the compression face to the centre of the tensile steel when an element is subjected to a bending moment.
What is the minimum thickness of slab?
Minimum Thickness of Slab The minimum thickness of the RCC slab is 4″ or 100mm, 3″ for sidewalk, 4″ for patios, 6″ for driveway, and minimum 4″ thick for parking. It will be restricted to 4 times the nominal size of aggregate.
Why is top reinforcement used in slabs?
TOP Bar : Top bar acts as reinforcement which provides strength against flexular moment. It also act reinforcement for compression load which is induced on the top side of beam. Bottom bar : Bottom bar provide strength for tensile load that is induced in lower portion of beam.
Which bars are called main bars in slab?
What are the main bars in a slab? The reinforcement bars that are placed in the tension zone of the slab to resist the bending moment & to transfer the superimposed loads to the supports that are provided for the slab are called main bars.
Why alternate bars are bent up in slab?
To resist Hogging (Negative Bending Moment) at supports. To counter the risk of the failure of the slabs. By providing crank the strength of slab increased. …
What is negative bar in slab?
Postive bars are provided to resist positive moments, and they are provided at the bottom of the two way slab whereas negative bars are provided to resist negative moments and they are provided on the top of the two way slab.
What is a bar bending schedule?
Bar bending schedule or schedule of bars is a tabular representation of reinforcement bar. It is generally represented for each type of R.C.C work. … Bar bending schedule generally describes the particulars of bars, shape of bending with sketches and total length and weight of the bars along with their numbers.
What is the clear cover for foundation slab and beams?
What Is the Clear Cover for Foundation Slab and Beams? The size of clear cover 40mm is apply for column, 25mm for beam, 15 to 20 mm for slab, 15mm for staircase and 40 to 50mm for foundation.
What is temperature bars in slab?
Steel rods placed horizontally in concrete slabs for prevention of cracks due to temperature changes or drying; placed parallel to the reinforcing rods.
