Terms and terminologies in prestressed concrete
ADVANTAGES AND DISADVANTAGES OF PRESTRESSED CONCRETE
ADVANTAGES :
Use of high strength concrete and freedom from cracks, in prestressed members, contribute to improved durability under aggressive environmental conditions.
The use of high strength concrete and high tensile steel in prestressed concrete members results in lighter and slender members than could be possible by using reinforced concrete and Mild steel as reinforcement. In prestressed concrete, steel is no longer required for reinforcement, but it is provided there as a means of prestressing. Prestressed concrete needs about one-third the quantity of concrete and one-fourth of steel as compared to Reinforced Cement Concrete.
Prestressed Concrete members possess better resistance to shearing force due to effect of compressive stresses presence or eccentric cable profiles.
In prestressed members, dead loads may be counterbalanced by eccentric prestressing, whereas in Reinforced Cement Concrete dead loads are of great importance. There is saving in use of materials in prestressed concrete.
Long span structures are possible in prestressed concrete so that saving in weight becomes significant whereas in Reinforced Cement Concrete very heavy sections are required.
In fully prestressed members, free from tensile stresses under working loads, whole of the section is effective, whereas in Reinforced Cement Concrete only 30 to 40 percent of the concrete actively resists bending, thus, material is wasted.
Factory products are possible in prestressed concrete members whereas Reinforced Cement Concrete members have to be cast- in-situ.
Prestressed concrete structures deflect appreciably before ultimate failure, then giving ample warning before collapse. No such indication is therein even an under-reinforced R.C.C. beam.
Prestressed concrete members are tested before use but Reinforced Cement Concrete members cannot be tested as such.
Fatigue strength of prestressed concrete members is better
ADVANTAGES :
Use of high strength concrete and freedom from cracks, in prestressed members, contribute to improved durability under aggressive environmental conditions.
The use of high strength concrete and high tensile steel in prestressed concrete members results in lighter and slender members than could be possible by using reinforced concrete and Mild steel as reinforcement. In prestressed concrete, steel is no longer required for reinforcement, but it is provided there as a means of prestressing. Prestressed concrete needs about one-third the quantity of concrete and one-fourth of steel as compared to Reinforced Cement Concrete.
Prestressed Concrete members possess better resistance to shearing force due to effect of compressive stresses presence or eccentric cable profiles.
In prestressed members, dead loads may be counterbalanced by eccentric prestressing, whereas in Reinforced Cement Concrete dead loads are of great importance. There is saving in use of materials in prestressed concrete.
Long span structures are possible in prestressed concrete so that saving in weight becomes significant whereas in Reinforced Cement Concrete very heavy sections are required.
In fully prestressed members, free from tensile stresses under working loads, whole of the section is effective, whereas in Reinforced Cement Concrete only 30 to 40 percent of the concrete actively resists bending, thus, material is wasted.
Factory products are possible in prestressed concrete members whereas Reinforced Cement Concrete members have to be cast- in-situ.
Prestressed concrete structures deflect appreciably before ultimate failure, then giving ample warning before collapse. No such indication is therein even an under-reinforced R.C.C. beam.
Prestressed concrete members are tested before use but Reinforced Cement Concrete members cannot be tested as such.
Fatigue strength of prestressed concrete members is better