What is LX and LY in slab?

For any slab, if Ly = Lx, the slab has a tendency to bend in both directions. With an increase of Ly, the tendency of bending along Ly is reduced and that on Lx is increased. When Ly/Lx ≥ 2, the slab bends only in X directions. When Ly/Lx ≥ 2, the slab is called a one way slab.

Why ly LX is 2?

As per IS 456:2000, One way slab is nothing but a slab that has the ratio of longer span to shorter span>= 2. That means anyone of the slab's sides is two times greater than or equal to the other side. Assume a slab (5m x 2m), The ratio of longer to shorter side is = 5/2 = 2.5. Ly/Lx >= 2, Since this is a one way slab.

When ratio of Ly longer slab )/ LX shorter span is 2 which type of slab is it?

Major point in one way slab:-

2) in one way slab load is acting vertically and carried in one direction of longer span of opposite sides. General load is acting in one direction. 3) in one way slab the ratio of longer span to shorter span is equal or greater than 2,ly/lx ≥ 2.

What is oneway and twoway slab?

The basic difference between One Way and Two Way Slab is that the bending moment occurs only in one direction i.e. the shorter direction in One Way Slab while in Two Way Slab bending moment occurs in both directions i.e. shorter and longer.

When aspect ratio is 2 then type of slab is?

If L/b the ratio is greater than or equal to 2 then it is considered a one-way slab. If L/b the ratio is less than 2 then it is considered a two-way slab.

What is LX in slab?

For any slab, if Ly = Lx, the slab has a tendency to bend in both directions. With an increase of Ly, the tendency of bending along Ly is reduced and that on Lx is increased. When Ly/Lx ≥ 2, the slab bends only in X directions. When Ly/Lx ≥ 2, the slab is called a one way slab.

What is cantilever slab?

Cantilever slabs are common features in buildings due to the need to have bigger spaces at upper floors. To achieve this, architects normally extend the slab beyond the ground floor building line, thereby forming a cantilever.

What is single 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.

What is crank bar in slab?

Cranked bars / Bent up bars are provided on top of the reinforcement to resist negative bending moment/Hogging at the supports of the slab. To resist the shear force at the supports. To reduce the risk of a brittle failure of slab-column connection.

What is modular ratio?

Definition. Modular ratio ( ) is the ratio of the elastic modulus of a particular material in a cross-section to the elastic modulus of the “base” or the reference material.

What is two way slab design?

A two-way slab is a slab that is supported on all its four sides by beams. The supports carry the loads along both directions of the slab. Hence, it is called a two-way slab. If the longer span of the slab is ly and the shorter span is lx, then if it is a two-way slab, ly/lx is less than 2.

What is one way slab design?

One-way slab is a type of concrete slab in which loads are transferred in one direction to the supporting beams and columns. Therefore, the bending occurs in only one direction. The design of one-way slab is simple and can be carried out easily.

What are the types of slabs?

What are the 16 different types of slabs in construction?

• One-Way Flat Slab. ...
• Two-Way Flat Slab. ...
• Kitchen Slab. ...
• Sun Shade Slab. ...
• Lintel. ...
• Sunken Slab. ...
• Cable Suspension Slab. ...
• Pre-Tension Slab.

What is flat slab?

A flat slab is a two-way reinforced concrete slab that usually does not have beams and girders, and the loads are transferred directly to the supporting concrete columns. The flat plate is a two-way reinforced concrete framing system utilizing a slab of uniform thickness, the simplest of structural shapes.

What is 2way slab reinforcement?

In two way slab, as the loads are carried in both directions (longer and shorter direction) main reinforcement bars are provided in both directions. The loads are carried by two sides are equal. Slab with reinforcement in both directions is more economical than one way reinforcement slabs. So it is a 2 way slab.

How is one way slab calculated?

Bar Bending Schedule of One way Slab

• 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:

Why bars are bent in slab?

Bars Are Bend Near At Support To

1- To resist shear force. 2-To resist (NBM) adjacent at supports. 3- To increment the strength of RCC in the slab. 4- Bent Up bar can abate the amount of steel.

What is negative bar in slab?

In beam, part where moment is sagging(generally, at near mid point)reinforcement provided in lower side that is called positive reinforcement. If moment is hogging(generally, at near support), then reinforcement provided at upper side of beam, it is called as negative reinforcement. Thanks.

What is lapping zone?

LAPPING ZONE

If the length of the column is L, then the length L / 4 from the top and bottom of the column is classified as tension A-zone and the central length L / 2 of the column (B-Zone) is considered a safe area for the purpose of lapping.

What is crank length in slab?

Crank is a slight bending in bars at the lap so that maintains the clear cover even at the lap position. The rule that is generally practiced is that the slope of crank 1:10 & minimum length of crank 300 mm.

What are the types of column?

The following are different types of columns,

• Square or Rectangular Column.
• Circular Column.
• L and T shaped Column.
• Tied Column.
• Spiral Column.
• Composite Column.
• Axially Loaded Column.
• Uniaxial Eccentrically Loaded Column.

What is cantilever principle?

A cantilever is a rigid structural element that extends horizontally and is supported at only one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a cantilever can be formed as a beam, plate, truss, or slab.

What is cantilever load?

cantilever, beam supported at one end and carrying a load at the other end or distributed along the unsupported portion. The upper half of the thickness of such a beam is subjected to tensile stress, tending to elongate the fibres, the lower half to compressive stress, tending to crush them.

What is a continuous slab?

A slab which extends as a unit over three or more supports in a given direction.