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To mobilise the compressive strength of the full thickness of the slab. For an explanation see below.
Concrete tends to be stronger in compression than tension. If you can imagine a large flat slab of concrete that is much wider than it is thick (for example a slab to be used in the construction of the floor of an upper level of a house), it will be supported at the corners or edges. This allows the centre of the slab to deform vertically downwards (by a very small amount).
This deformation due to it's own self weight generates stresses in the slab. You now need to imagine that there was a straight line drawn along the centre of the edge of the slab from one end to the other. When the slab deforms this line will become a curve or arch. This is in fact what the slab is doing - performing as an arch. This means that the lower portion of the slab (below the line will have stretched and be under tension and the upper portion of the slab will have been compressed. Now in this case the failure strength of the arch is being controlled by the tensile strength of the slab which is much lower than it's compressive strength.
As such when the concrete is being formed, high tensile strength steel wires are connected to anchor points in the factory and they are stretched or placed under a tensile stress. The concrete is than poured into a mould around the steel wire and allowed to set (or cure). The concrete than adheres to the steel cable. Once the concrete has fully hardened the stell wires are cut from the anchor points and the steel wires attempt to return to their original size, This stress is transferred to the concrete as compression by friction due to the bond between the c able and concrete.
Now when the concrete slab is used as a floor it begins to deform under it's own weight, however the pre-stressed steel wires already under tension act to pull the entire slab including the base back into a compressive stress state meaning that the whole of the slabs compressive strength is mobilised rather than just the upper half and this effectively acts to make the slab stronger.
There are a number of differing methods of making steel reinforce pre-stressed concrete and for further information, please see the related link.
What else can I help you with?
Why it is need to use high strength concrete in prestressed concrete?
to offer high resistance in tansion,shear and bond
Where does the high tensile steels are used in the ship?
High Tensile Steel (HTS) is generally used for prestressing tendons.
What is high tensile steel?
The alloy used for welding should be similar in strength to the bulk material being welded. Otherwise there will be stress concentration at the junction between the two alloys. This problem is somewhat reduced when the metals mix during welding, if the weld point moves slowly enough.
What is Ultra-High-Strength Steel?
it is technically about 3 times more tensile than ordinary steel .therfore this steel becomes a ultra strenthenedsteel.
What is the best material to use to reinforce concrete?
The best material to reinforce concrete is steel, typically in the form of rebar (reinforcing bars) or welded wire mesh. Steel's high tensile strength complements concrete's compressive strength, resulting in a composite material that can withstand various stresses. Additionally, fiber reinforcement, such as polypropylene or steel fibers, can also enhance the concrete's durability and crack resistance. The choice of reinforcement depends on the specific structural requirements and environmental conditions.
Why are bridges made of steel and concrete?
Steel is used for its high tensile strength and the concrete is used for its high compression strength.
What is high tensile?
High tensile steel is strong steel. It is 10 times stronger than wood and more than twice the tensile strength of mild steel. High tensile steel is commonly used in highway guardrails.
Why it is need to use high strength concrete in prestressed concrete?
to offer high resistance in tansion,shear and bond
Is Aluminuim in High Tensile Steel?
No
Why use high tensile steel?
High tensile steel put simply is used where structures require high tensile strength. Tensile stress is where the forces on a material are "pulling" from each end away from the centre. Steel can be alloyed with certain materials such as aluminum to create a material that is stronger under tensile loading. An example of where high tensile steel is required is the cables of the ANZAC bridge that support its deck. Hope this helps..
Pre stressed concrete compared to Post tensioned concrete?
Prestressed concete made using high tensile wires which is stressed (as per the design load) before concreting, and post tensioned concrete made of Strands covered with duct, in this, wires/strnads are stressed after concreting then the ducts are grouted using cement slurry..
Why steel is used to reinforce concrete?
Concrete reinforcing steel is commonly used in bridges, buildings, skyscrapers and road construction. Reinforcing concrete with steel significantly increases its strength in an economical and safe manner.
What has the author J A Ramirez written?
J. A. Ramirez has written: 'Review of design procedures for shear and torsion in reinforced and prestressed concrete' -- subject(s): Concrete beams, Prestressed concrete construction, Reinforced concrete construction, Shear (Mechanics), Torsion 'Robust Speech Recognition and Understanding' 'Transfer, development, and splice length for strand/reinforcement in high-strength concrete' 'Experimental verification of design procedures for shear and torsion in reinforced and prestressed concrete' -- subject(s): Concrete beams, Shear (Mechanics), Testing, Torsion 'Proposed design procedures for shear and torsion in reinforced and prestressed concrete' -- subject(s): Concrete beams, Prestressed concrete beams, Shear (Mechanics), Torsion
What is theGrades of steel high tensile steel?
the grades of steel are S275,S355and S460
When did Hyundai start to use high tensile steel in there elantra models?
Hyundai have always used high tensile steel in certain components of all their vehicles.
Where does the high tensile steels are used in the ship?
High Tensile Steel (HTS) is generally used for prestressing tendons.
What is the grade of high tensile steel?
Q-145
