What are the conditions to be followed in design of slab?

Steps to be followed in the design of slab Find the effective span which is lesser of (i) distance between centres of bearings, and (ii) clear span and effective depth. Find the dead load and the live load per square meter of the slab. Determine the maximum bending moment for a one meter wide strip of the slab.

What is floor slab details?

The term ‘floor slab’ usually refers to a floor that has been formed using concrete (and generally steel reinforcement) and may form part of the structure of a building. It may form the floor of a basement, at ground level or at upper levels.

How do you build a slab floor?

The construction of a floor slab is done in five steps:

1. The founding (shallow foundation / deep foundation) Depending on the subsoil, the first decision is which type of foundation to use.
2. The drainage.
3. Formwork and installation of the spacers.
4. The reinforcement.
5. The concreting.

How do you design a slab thickness?

Standards like ACI 318 have specified the minimum thickness of the slab based on the span of the slab.

1. Simply Supported Slab = Span / 20.
2. One End Continuous Slab = Span / 24.
3. Both End Continuous Slab = Span / 28.
4. Cantiliver = Span / 10.

What’s the ratio for slab?

A concrete mix of 1 part cement : 2 parts sand : 4 parts coarse aggregate should be used for a concrete slab. Concrete must be placed within half an hour of mixing.

What is the purpose of a floor slab?

Simply, a floor slab functions to distribute without deformation or cracking, the loads applied to it to the weaker sub-grade below, in the case of a ground bearing slab, or to the piles supporting it if designed as a suspended ground slab, and to provide a suitable wearing surface upon which the operations in the …

How thick should a first floor slab be?

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 motor homes or garbage trucks. To prepare the base, cut the ground level to the proper depth to allow for the slab thickness.

How thick should a slab be?

How long can a concrete slab span?

Reinforced concrete allows a wide range of structural options and provides cost-effective solutions for a multitude of situations—from residential buildings with moderate live loads and spans of about 25 ft, to commercial buildings with heavier live loads and spans ranging from 40 ft to 50 ft and beyond.

What is the maximum span allowed for an RCC slab without beams?

4 days ago
The load is transferred to columns in proper reinforcement details. Hence practically a designer can avoid beams (the word used as a conventional one) for a span of 50m or even more.

When to use concrete floor slabs on grade?

Dynamic and/or oscillatory This manual prescribes the criteria for the design of concrete floor slabs on grade in buildings for heavy loads and is applicable to all elements responsible for military construction. Heavy loads in buildings such as warehouses include moving loads, stationary live loads, and wall loads. 1-2. Scope.

What can be done to improve slab support?

However, strong support from sub-grades or sub-bases improves slab edge support. The sub-grade can be improved by proper drainage and adequate compaction or soil stabilization. In cases of extremely poor soil, removal and replacement of the sub-grade with an off site compactable material will often be necessary.

What should I do if I put a slab on my foundation?

Any cooler surface in contact with the slab will try to steal its heat. If you’re pouring up against your foundation walls, insulate between the slab and the walls. For a cleaner looking installation, cut the top edge of the foam board at a 45-degree angle so the concrete will flow all the way to the foundation wall and hide the foam.

Can a two way concrete slab be solved?

Two-way concrete slabs with openings These problems cannot be solved by analytical methods since such structures like concrete slabs with openings, especially strengthened with carbon fibres, are too complicated.

Dynamic and/or oscillatory This manual prescribes the criteria for the design of concrete floor slabs on grade in buildings for heavy loads and is applicable to all elements responsible for military construction. Heavy loads in buildings such as warehouses include moving loads, stationary live loads, and wall loads. 1-2. Scope.

How are ribbed slabs used in building design?

One method of overcoming this problem is to use ribbed slabs which are suitable for longer spans supporting light loading, as in residential or commercial buildings. The layout of a floor slab is shown in Figure 1 below. Design the floor to satisfy ultimate and serviceability limit state requirements.

However, strong support from sub-grades or sub-bases improves slab edge support. The sub-grade can be improved by proper drainage and adequate compaction or soil stabilization. In cases of extremely poor soil, removal and replacement of the sub-grade with an off site compactable material will often be necessary.

How is the strength of a slab determined?

The layout of a floor slab is shown in Figure 1 below. Design the floor to satisfy ultimate and serviceability limit state requirements. (Concrete grade = 30 MPa, Yield strength of reinforcement = 500 MPa, variable action on floor = 2.5 kPa, Fire rating = 1 hour 30 minutes).