How do you calculate steel for a slab?
How do you calculate steel for a slab?
The quantity is done in two steps.
- (Calculation of Bars No’s) First, calculate the number of bars required (main and distribution both). FORMULA = (Total length – Clear cover)/center to center spacing + 1. Main bar = (5000 – (25+25))/100 + 1.
- (Cutting length) MAIN BAR: FORMULA = (L) + (2 x Ld) + (1 x 0.42D) – (2 x 1d)
How many square feet does a slab of steel need?
Steel required in slab per square feet: Steel required in roof slab depends on types of building structure residential, commercial, industrial, multistorey, institutional, slab type, support condition, live load, framing of building and design method adopted, generally Steel required in slab is ranging between 0.7 kg …
What size rebar should be used on a 4 slab?
No, you do not need rebar for a 4-inch slab of concrete on grade. A 4-inch-thick slab cast on the ground and in permanent contact with it will float and rebar is not required. Rebar is recommended on concrete measuring 5 – 6 inches thick.
How is slab calculated?
How to calculate concrete:
- Determine how thick you want the concrete.
- Measure the length and width that you’d like to cover.
- Multiply the length by the width to determine square footage.
- Convert the thickness from inches to feet.
- Multiply the thickness in feet by the square footage to determine cubic feet.
What is RCC code?
IS 456-2000 Plain and Reinforced Concrete – Code of Practice is an Indian Standard code of practice for general structural use of plain and reinforced concrete.
What is a RCC slab?
On technical drawings, reinforced concrete slabs are often abbreviated to “r.c.c. slab” or simply “r.c.”. Calculations and drawings are often done by structural engineers in CAD software.
What is the minimum depth of slab?
Minimum thickness of slab Minimum thickness of rcc slab is 4″ or 100mm, 3″ for side walk, 4″ for patios, 6″ for driveway and minimum 4″ thick for parking. It will be restricted to 4 times the nominal size of aggregate.
What is used in RCC slab?
Materials used for the formwork The formwork is commonly built from wooden planks and boards, plastic, or steel. On commercial building sites today, plastic and steel are more common as they save labour.
Where is slab used?
A slab is a structural element, made of concrete, that is used to create flat horizontal surfaces such as floors, roof decks and ceilings. A slab is generally several inches thick and supported by beams,columns, walls, or the ground.
Is lime used in RCC?
Following materials are required for making R.C.C. work: Cement: Before the introduction of ordinary Portland cement, lime was used as a cementing material.
How do I cast a RCC slab?
The casting of RCC slab comprises of following three steps:
- Reinforcement. It has to be prepared according to the BBS arranged as per the approved drawing.
- Concreting. a) Construction Joint.
- Curing. The curing has to be commenced straight away after thumb set of the concrete laid down.
How is slab construction done on site?
Concrete floor slab construction process includes erection of formwork, placement of reinforcement, pouring, compacting and finishing concrete and lastly removal of formwork and curing of concrete slab.
What are the types of slab?
Concrete Slab Types – Construction, Cost, and Applications
- One-Way Slabs on Beams.
- One-way joist slab (Ribbed slab)
- Waffle Slab (Grid slab)
- Flat Plates.
- Flat Slabs.
- Two-way Slabs on Beams.
- Hollow core slab.
- Hardy Slab.
Which slab is best?
Two way slabs are the slabs that are supported on four sides and the ratio of longer span (l) to shorter span (b) is less than 2. In two way slabs, load will be carried in both the directions. So, main reinforcement is provided in both direction for two way slabs.
What is an M class slab?
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.
What is slab and its type?
What is a Slab? Slabs are constructed to provide flat surfaces, usually horizontal in building floors, roofs, bridges, and other types of structures. The slab may be supported by walls or by reinforced concrete beams usually cast monolithically with the slab or by structural steel beams or by columns, or by the ground.
What is slab level?
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.
What is a pan slab?
One is the pan joist system, a standardized beam and girder system of constant depth formed with prefabricated sheet-metal forms. A two-way version of pan joists, called the waffle slab, uses prefabricated hollow sheet-metal domes to create a grid pattern of voids in a solid floor slab, saving…
What is the difference between ribbed slab and waffle slab?
Ribbed slabs are made up of wide band beams running between columns with narrow ribs spanning the orthogonal direction. Normally the ribs and the beams are the same depth. Waffle slabs have a thin topping slab and narrow ribs spanning in both directions between column heads or band beams.
How thick is a waffle slab?
130 mm
What is the difference between raft slab and waffle slab?
Raft slabs are cast against the ground whereas waffle slabs are cast onto polystyrene void formers and strips of concrete. An overloaded raft slab is less likely to crack because it is cast onto the ground.
Is a waffle slab cheaper?
Waffle pod slabs are innovative because they use polystyrene void formers rated for efficient thermal insulation. These factors generally mean that a waffle pod slab will be significantly cheaper than a regular concrete raft slab.
Is waffle slab good?
They work perfectly well on non-reactive sites, slightly reactive clay sites and some moderately reactive clay sites. Waffle slabs are not recommended for use on highly reactive clay sites (Class H1 and H2) because the requirements for good drainage will be nearly impossible to achieve.
What does raft slab mean?
reinforced concrete slab