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Why do all concrete slabs need rebar?
When the slab is loaded and force applied to it, the top of the slab directly under the load will be put in compression. However at the bottom of the slab. the concrete will pull itself in tension. Put the ends of your fingers together than flex your wrist up. You will feel the pressure at the top of your fingertips and you will see a gap open at the bottom. That is what is happening in a slab. Concrete is strong in compression, poor in tension. Rebar, or steel, is the opposite. By combining the two, you develop a product that is superior and complimentary to the strengths and weaknesses of the individual materials.
How deep to put rebar in concrete?
It depends on the structural element in which the bars are being placed. In a footing, it is 3" clr of the bottom of the ftg. In a slab, it can be centered in the slab or located towards the top or bottom. Details and sections shown on the structural drawings or general notations or specifications by the engineer of the projects record should clarify the exact location the bar is to be placed.
How thick should you pour your cement slab?
As a guideline, 4 inches thick, but it would depend on what is going to be sitting on top of it. You may need thicker and/or to reinforce it with rebar.
In a concrete slab where should steel reinforcing rods be embedded in slab?
A conventional slab will have two bars side by side near the top and bottom of each beam and a 16" grid across the entire top of the slab. Can't help you with a post tention... they are inventing new ways to take steel out of them every day.
How do you calculate the dead load of a structure?
well..dead load is calculated by the weight of all quantity of materials used for your slab, beam, column and foundation. though the structure is built from bottom, its analysis is always done from the top..
Why do all concrete slabs need rebar?
When the slab is loaded and force applied to it, the top of the slab directly under the load will be put in compression. However at the bottom of the slab. the concrete will pull itself in tension. Put the ends of your fingers together than flex your wrist up. You will feel the pressure at the top of your fingertips and you will see a gap open at the bottom. That is what is happening in a slab. Concrete is strong in compression, poor in tension. Rebar, or steel, is the opposite. By combining the two, you develop a product that is superior and complimentary to the strengths and weaknesses of the individual materials.
Do all concrete slabs need rebars?
When the slab is loaded and force applied to it, the top of the slab directly under the load will be put in compression. However at the bottom of the slab. the concrete will pull itself in tension. Put the ends of your fingers together than flex your wrist up. You will feel the pressure at the top of your fingertips and you will see a gap open at the bottom. That is what is happening in a slab. Concrete is strong in compression, poor in tension. Rebar, or steel, is the opposite. By combining the two, you develop a product that is superior and complimentary to the strengths and weaknesses of the individual materials.
How deep to put rebar in concrete?
It depends on the structural element in which the bars are being placed. In a footing, it is 3" clr of the bottom of the ftg. In a slab, it can be centered in the slab or located towards the top or bottom. Details and sections shown on the structural drawings or general notations or specifications by the engineer of the projects record should clarify the exact location the bar is to be placed.
How thick should you pour your cement slab?
As a guideline, 4 inches thick, but it would depend on what is going to be sitting on top of it. You may need thicker and/or to reinforce it with rebar.
In a concrete slab where should steel reinforcing rods be embedded in slab?
A conventional slab will have two bars side by side near the top and bottom of each beam and a 16" grid across the entire top of the slab. Can't help you with a post tention... they are inventing new ways to take steel out of them every day.
Locations of compression and tension in footing rebars?
Compression and tension occur in opposite side of the footing relative to position. So, at a spread ftg or pile cap, the top reinforcing will be in tension and the bottom compression. At the midspan, between spread ftgs or pile caps, the tension will occur in the bottom and compression in the top. Rebar lap splices usually occur in the compression points, so bottom lap at spread ftgs and top at midspans. Also, details will typical have additional rebar at the points of maximum tension so at the top over supports and bottom at midspans. This though should be confirmed with the Engineer of Record on any project, as assumptions can change project to project. But this is the general concept.
How do you calculate the dead load of a structure?
well..dead load is calculated by the weight of all quantity of materials used for your slab, beam, column and foundation. though the structure is built from bottom, its analysis is always done from the top..
Where is the place of main bar in rectangular footing?
in a rectangular foundation long bars to be in bottom and short bar to be on top of long bars, where as in slab opposite to the foooting bars
How do you calculate the crank lenght in a rcc slab?
Crank lengths are used because the moments at the edge strips are negative while that at mid span are positive so reinforcement are alternatively provided at the top and bottom respectively.. so just to have connection between the reinforcement and for the slab to behave as a single unit by providing continuous bars, cranking is done in slabs..
What is the minimum of flate slab design?
Since most flat slabs contain reinforcing steel, the minimum would be the thickness required to cover the steel, generally 2" top and bottom. But the real answer depends on what the slab is supporting and the level of safety required. For a very general situation where the slab is supported on all sides and not significantly longer in one direction, a slab can be 6" wide and support light loading if properly reinforced.
What connects walls to floors?
The wall has a bottom plate or 2x4 laying flat that is nailed to the bottom of the studs. Two top plates at the top of the wall. The wall is built, stood up and nailed down to the floor. If the house is set on a concrete slab, bolts are set in the concrete and the wall is bolted down.
How much steel do you need for a grade beam of a normal building?
That is something an engineer usually determines. Soil conditions dictate the make up of the beams. A common configuration would be an 18" beam with 2 #5 rebar on the top and bottom.
