Prestressed Concrete

What are Prestressed concrete advantages and disadvantages?

In general, there are many prestressed concrete advantages and disadvantages. Some of the prestressed concrete advantages and disadvantages are explained below.

Prestressed Concrete Advantages

Prestress concrete offers incredible specialized benefits in examination with different types of development or construction, like steel and reinforced concrete. On account of completely prestressed members, which are liberated from tensile stresses under working loads, the cross area is all the more proficiently used when examined with a reinforced concrete segment which is broken under working loads.

Inside specific restricts, an extremely durable dead load might be neutralized by expanding the eccentricity of the prestressing force in a prestressed primary component, subsequently affecting savings in the utilization of materials. Prestressed concrete members have further developed resistance from shearing forces, because of the impact of compressive prestress, which diminishes the chief tensile stress.

The utilization of curved cables, especially in long range members, assists with decreasing the shear force created at the support sections. The prestress concrete flexural member is stiffer under working loads than a reinforced concrete member of a similar profundity. However, after the beginning of breaking the flexural conduct of a prestressed member is like that of a reinforced concrete member.

The utilization of high strength steel and concrete in prestressed members bring about lighter and slender members than is conceivable with reinforced concrete. The two structural provisions of prestressed concrete, to be specific high strength concrete and independence from breaks, adds to the further developed solidness to the construction under forceful ecological conditions.

Prestressing of concrete works on the capacity of the material for energy retention under sway loads. The capacity to oppose continued working loads has been end up being as great in prestressed as in reinforced concrete. The economy of prestressed concrete is grounded for long span structures. According to Dean, normalized precast bridge beams somewhere in the range of 10 m to 30 m long and precast prestressed piles have end up being more affordable than reinforce concrete and steel in United States.

According to Abeles, precast prestressed concrete is efficient for floors, rooftops and bridges of span up to 30 m and for cast in-situ works, up to 100 m. In the long span range, prestressed concrete is by and large more practical than steel and reinforced concrete. Prestressed concrete has extensive strength because of its ability for totally recovering from considerable impacts of overloading without undergoing any genuine harm.

Leonhardt points out that in prestressed concrete components, breaks which briefly create under incidental overloading closeup totally when the loads are taken out. Since the weakness strength of prestressed concrete is similarly better compared to that of different materials, predominantly because of the little stress varieties in prestressing steel, it is suggested for powerfully loaded constructions, for example, rail line bridges and machine foundations.

Because of the usage of the concrete in the strain zone and additional saving of 15 to 30 percent in concrete is conceivable in examination with reinforced concrete. The savings are impressively higher that is 60-80 percent which is mainly due to high permissible stresses that is allowed in the high flexible wires. In spite of the fact that there is extensive savings on the amount of materials utilized in prestressed concrete members, it isn’t much huge because of the extra expenses incurred in the high strength concrete, high tractable steel, moorings and other equipment needed for the creation of prestressed members.

In any case, there is a general economy in using prestressed concrete, as the reduction in extra weight diminishes the plan loads and the expense of foundations. These are some of the prestressed concrete advantages.

There are many prestressed concrete advantages. The main prestressed concrete advantages are as follows:

1. The overall lifespan of prestressed structures is more imperative than the RCC structures considering the way that the reinforcement stays unaffected or undisturbed from external agencies.
2. More modest areas can be utilized for longer span by reducing the segment of members.
3. It requires a more modest measure of development materials.
4. Prestressing additionally decreases the inclining strain in concrete.
5. Prestressed members are liberated from breaks and the protection from the impact of effect, shock and stresses are higher than RCC structures.
6. High compressive strength of steel and high compressive strength of concrete are utilized for prestressing that makes it more affordable.
7. Prestressed members are lighter in weight and effectively movable.
8. The shear obstruction of members can be increased by using curved tendons.
9. Prestressed concrete can be utilized with advantage in that load of designs where strain grows, for example, tie and suspender of a bow string support, sleepers, rail roads, electric posts, up stream face of gravity dam and so forth.
10. The improvement of prestressed concrete outcomes in the development of a sizable fluid retaining structure that would not in any case be conceivable.
11. Thinner sections, that are significant for tall structures likewise with a similar measure of cost, it can build a larger number of slabs than customary thicker pieces.
12. The prestressed concrete has the longer durability.
13. The longer span length increases the untroubled floor space or area and parking facilities.
14. As opposed to ordinary concrete components, the whole concrete cross part of prestressed concrete opposes applied load. This is on the grounds that the concrete in pressure zone doesn’t experience cracking and thus it would partake in carrying loads.
15. Prestressed concrete beams have generally low redirections.
16. Enormous fluid retaining structures developed from prestressed concrete have minimal expense and are ideally protected against cracking and subsequent spillage.
17. The general amount of required steel in prestressed concrete is 1/3 of that needed for reinforced concrete, yet the steel for the previous ought to have high elasticity.
18. Essentially, dead loads are nonpartisan in a prestressed concrete pillar. Subsequently, the dead load weight of the construction is diminished which brings about decreased utilization of materials.
19. Longer spans brings about less joints, subsequently, less maintenance is required.
20. The spans of prestressed beams and braces are longer contrasted and that of reinforced concrete.

Prestressed Concrete Disadvantages

The main prestressed concrete disadvantages are as follows:

1. The major disadvantage of prestressing is that it requires some exceptional supplies like jacks, jetty or anchorage and so forth which imagines the utilization of prestressing.
2. It requires highly skilled labors and ought to be ready under supervision watch.
3. Prestress concrete requires excellent thick concrete of high strength. Amazing quality concrete in production, situation and compaction is required.
4. High malleable steel is needed for prestressing that is extremely challenging to acquire.
5. It is costlier than other RCC structures.

Here it is discussed about the prestressed concrete advantages and prestressed concrete disadvantages.

Types of Prestressed Concrete

Application of Prestressed Concrete

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