In our daily life we see the many things to happened. Sometime we ignore them but sometimes it clicks our mind, that how it is working what is the principle behind that. If you are one of them then don’t worry because here you will get detailed description about the principle working behind them. So without wasting much more time let’s begin the today’s topic which is known as pre-stressed concrete. Firstly let’s understand the concept that what is prestressed concrete ? How prestressed concrete structures are made? what are the uses of prestressed concrete?
Behind the name of prestress concrete as the meaning of prestress is that it is already in stress. When any type of load is applied on any structure. Then different types of stresses are produced depending upon the nature of the load. Produced stress may be tensile stress, compressive stress, shear stress, bearing stress. Suppose if we are applying a load on any pre-stressed concrete lintel which will produce a stress in that structure. What if an opposite stress is already present which will counteract the stress produced by the load. Due to this already present stress structure will work very effectively and can bear the extra load compared to the simple reinforced concrete. Lets check the advantages of prestressed concrete structures , its uses and all about it.
How is concrete pre-stressed ?
When concrete is prestressed or say compressed during production it will become prestressed concrete. This compression is produced by the tensioning of high strength tendons which are located within the concrete. Tendons are consist of single wire, multiwire or rebars. In pre-stressed concrete internal stresses are produced in planned manner , so that stresses coming back from loads are counteracted to desired degree.
Use of Prestressed Concrete
Prestressed concrete are used in buildings and structures which need longer spans. Such as Dams, skyscrapers , bridge , silos & tanks are made from pre-stressed concrete. Prestressed concrete is so powerful that its even used for nuclear structures. Its a highly versatile material thats why its an ideal material for heavy duty works.
Need & Advantage of Prestressed Concrete
Regardless of RCC have magnificent characteristics as a primary material, concrete has a few shortcomings, as well. One is that it has practically no strength against strain. Concrete can withstand an enormous measure of compressive pressure, however when you attempt to pull it separated, it surrenders without any problem. Concrete’s other shortcoming is that it’s fragile. It doesn’t have any “give” or stretch or pliability. Consolidate these two shortcomings, and you get breaks. Concrete loves to break. Also, in case you’re planning or building something made of concrete, seeing how a lot and where it will break can be the distinction between the achievement and disappointment of your construction.
To see how architect’s plan supported concrete constructions, we initially need to comprehend plan models – or the objectives of the design. The conspicuous objective that we as a whole comprehend is that it shouldn’t tumble down. At the point when a vehicle drives over a scaffold and the extension doesn’t implode, the construction is accomplishing its plan measure of extreme strength. In any case, as a rule in primary designing, staying away from breakdown really isn’t the restricting plan standards. The other significant objective is to stay away from diversion, or development under load. Most primary individuals divert a considerable amount before they really come up short, and this can be terrible information. The main motivation behind why is insight. Individuals don’t have a sense of security on a design that flexes and curves. We need our extensions and structures to feel durable and resolute. The other explanation is that things connected to the design like mortar or glass may break in the event that it diverts excessively.
On account of supported concrete, redirection has another effect: breaks. The support inside concrete is generally produced using steel, and steel is considerably more flexible than concrete. In this way, to assemble the strength of the steel, first it needs to extend a bit. Yet, in contrast to steel, concrete is weak – it’s doesn’t extend, it breaks. So that frequently implies that concrete needs to break before the rebar can take up any of the elastic pressure of the part.
One answer for this issue of avoidance in concrete individuals is prestressed concrete. This is regularly cultivated by tensioning the support inside the concrete. This gives the part a compressive pressure that will adjust the elastic anxieties forced in the part whenever it is placed into administration. A customarily supported concrete part doesn’t have any pressure to begin with, so it will divert a lot of a long time before it’s in any peril of not being sufficiently able to hold the heap. So with traditional support, you don’t will exploit the underlying strength of the part. At the point when you prestress the support inside concrete, you don’t really expand its solidarity, yet you do lessen its redirection. This adjust the greatest burden permitted under every one of the foundational layout standards, permitting you to exploit the strength of every material.
The meaning of prestress is that it is already in stress. When any type of load is applied on any structure. Then different types of stresses are produced depending upon the nature of the load. Produced stress may be tensile stress, compressive stress, shear stress, bearing stress.
The process behind prestressing of concrete is that stress is induced in tendons in phased manners so that it can counteract when load is applied on them.
The major difference between both of them is their weigh. RCC is known for their heavy wide structures meanwhile prestressed concrete is much more lighter.
Prestressed concrete have mainly two types. One is Pretensioned concrete other is post tensioned concrete. Further post tentioned concrete have two types which are Bonded & Unbonded
The major advantage of prestressed concrete is their lightweight, effectiveness, load bearing capability and elasticity.