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 LY and LX in slab?

Ly - Longer span of slab. Lx - Shorter span of 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.

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.

How do you calculate a one way two way slab?

If slabs may be supported by columns only, in this case, two-way action will prevail. If the ratio of long side / short side > 2 it is considered as one-way slab, and if longer side to shorter side ratio < 2 then it is considered as a two-way slab.

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 the minimum thickness of slab?

Minimum thickness should not be less than 4.75 inches not forgetting the factor of safety. Standard concrete floor slab thickness in residential construction is 4 inches, five to six inches is recommended if the concrete will receive occasional heavy loads, such as mortar homes or garbage trucks.

What is an M class slab?

Class M means that the soil found on your clay or silt site is moderately reactive. The movement expected from this type of soil is 20-40mm. Class M sites require a stiffened slab with cross beams in the slab. The stiffening prevents the slab from twisting and bending as the clay soil moves.

What is a Class P slab?

The ability of the soil to evenly bear a load is very poor. Sites may be classified as 'Class P' as a result of mine subsidence, landslip, collapse activity or coastal erosion (e.g. dunes), soft soils with a lack of suitable bearing, cut and/or filled sites, or creep areas.

What is a solid slab?

Solid Slabs are fully customizable concrete slabs of varying width, length and thickness. Solid Slabs can be designed and produced with mild reinforcing or by adding prestressing strands.

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 are flat slabs?

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 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 is LY LX?

One way Slab reinforcement details:-

From fig, it is clear that Ly/Lx = 8/3 =1 ≥ 2.66. Hence, One-way slab is adopted where Cranked bars (main bars) are provided on the shorter side of the slab due to bending. Distribution bars(straight bars) provided on the longer side as shown in fig.

What is crank bar?

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 singly reinforced beam?

The beam that is longitudinally reinforced only in tension zone, it is known as singly reinforced beam. In Such beams, the ultimate bending moment and the tension due to bending are carried by the reinforcement, while the compression is carried by the concrete.

What is H2 class slab?

It comes down to this: a class H2 soil is a highly reactive clayey soil that between wettish and dryish soil moisture conditions can produce very high ground movement. In numbers: 60mm to 75mm of vertical movement.

What is an S class slab?

Class S - Slightly reactive soil, slight movement due to moisture. Class M - Moderately reactive soil, moderate movement due to moisture. Class H - Highly reactive soil, a high amount of movement due to moisture. Class E - Extremely reactive soil, extreme movement due to moisture.

Is Class S soil good?

Class S Soil

They are nice and easy to design. There is no reactive clay movement to worry about. the soil is relatively stable and firm and slab on ground houses only need slab thickenings under external walls and internal concentrated load points. We see Class “S” sites about 15% of the time.

Which class slab is best?

E Class soil type and slabs

This is the most extreme soil type and simply means this soil has a higher level of movement. Although E class slabs are the most expensive, the good news is your home will be sitting on a very strong slab and foundation!

What is the difference between M Class and H class slab?

“M – Moderately Reactive”, “H- Highly Reactive”, “P – Problematically Reactive”. Based on the reactiveness of the land to movement the structural engineer will design a slab to ensure it can handle your soil condition.

How thick is a H2 slab?

There is a difference between the thickness of the concrete used. A H1 slab uses a 300mm pod with 85mm thick concrete above. A H2 slab uses a 300mm pod with 100mm thick concrete above.

Is RCC a slab code?

Detailing Requirements of Reinforced Concrete Slab as per IS456: 2000.

What is the size of RCC slab?

In a residential building it is 9 ʺ × 12 ʺ or 225 mm × 300 mm standard size according to (IS codes). The minimum RCC beam size should not be less than 9 ʺ × 9 ʺ or 225mm × 225mm with the addition of a 125mm slab thickness.

What is the thickness of RCC slab?

According to Indian standard rcc concrete roof slab thickness in residential building construction is 4 inches (100mm). Use of 5″ to 6″ (125mm to 150mm) is recommended if the concrete will receive occasional heavy loads.