11 Dec 2016

Prestressed Concrete And It's Principle

Today i am writing about the Principle of Prestressed Concrete  as you know that last time i published a post about the Steam Curing of Concrete And its Methods. Some of my website viewers comment about to make a guide about Principle of Prestressing Concrete  . So i make a simple and easy post about in which i explain you all about Principle of Prestressed Concrete .

What is Prestressed Concrete ?

PRE-STRESSED CONCRETE
R.C.C is formed by the combination of concrete and steel. Steel is basically used to withstand tension. This can also be used to with stand compression if need be. While concrete is used to withstand compression only because concrete cannot withstand tension, These forces of compression and tension are produced by the external Applied Load.
Prestressed Concrete And It's Principle

According to the new research. If stress is produced opposite in nature to the stress induced due to external load in any component of R.C.C .the the resisting capacity of the component .The action of producing stress opposite to he expected stress in member in the design is called pre-stressing .this making the size of structure less. This makes the structure cheap and safe By this action compression in the tension part and tension in the compression part are produced .This action can only be applied by stretching steel bars. This stretching action is done in two ways . In the first type the steel bars are tension-ed before casting concrete which is called pre-tension. In the second type plastic or steel pipes are placed in the beam instead of bars before casting concrete. Then steel bars are inserted in the pipes or holes after hardening the concrete. This method is post-tension. Jacks are used in both of these desired tension. And the ends are anchored properly .High strength concrete is prepared or the construction of such structures .Also the steel of high strength is used .The concrete of at least 420 kg/cm (6000 lbs/in) is used .Such steel in the form of cold drawn and alloy steel is used .The structure prepared form pre-stressing action are used in big bridges and other such projects one of the advantage of pre-stressing is that there are no cracks in the tension zone of the structure. This enlarges the life of the structure.

Principle of Prestressed Concrete

The principle of the production of stress in the members of R.C.C is that the members of the R.C.C in which tension is expected compressive stress is beforehand produced in that member .By this action the R.C.C member becomes active in opposite expected stress before application of the load . When a load acts on such a member then this load tries to create tension in the member .Then the already compressive stress in the member neutralizes this tension. As a result there is not much stress in the member or it is completely destroyed .Due to the presence of tensile stress in the member of concrete there appear hair cracks in the concrete. These do not lessen the strength of concrete directly but they become the course of transferring of environmental humidity tot eh steel bars. As a result the steel becomes rusted .Then the R.C.C structure becomes weak. On the contrary, the entire cross section of a pre-stressed member without these cracks becomes able to with stand the more bending moment. In this way the size of beam or other member becomes less .And there remains no danger of cracks in a member due to tension

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