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Prestressed concrete baru
This document discusses prestressed concrete, which involves applying an initial compressive load to concrete before it experiences tensile stresses from use. Prestressing concrete improves its strength in tension. There are two main types: pre-tensioned concrete uses steel tendons that are tensioned before the concrete is cast around them, while post-tensioned concrete uses tendons tensioned after the concrete is cast. Prestressing concrete allows for longer spans and greater loads than ordinary reinforced concrete.
Prestressed concrete baru
- 1. PRE-STRESSED CONCRETE MUHAMMAD SHAHRON NIZAM MUHAMMAD SHABERY ZULHELMI ROSZITA KARTINA NURUL NAZIRA NUR ZANAH
- 2. Introduction A prestressed concrete structure is different from a conventional reinforced concrete structure due to the application of an initial load on the structure prior to its use. The initial load or ‘prestress’ is applied to enable the structure to counteract the stresses arising during its service period. The prestressing of a structure is not the only instance of prestressing. The concept of prestressing existed before the applications in concrete.
- 4. Pre stressed concreteis a method for overcoming concrete's natural weakness in tension It can be used to produce beams, floors or bridges with a longer span than is practical with ordinary reinforced concrete
- 5. Pre stressing tendons(generally of high tensile steel cable or rods) are used to provide a clamping load which produces a compressive stress that balances the tensile stress that the concrete compression member would otherwise experience due to a bending load Traditional reinforced concrete is based on the use of steel reinforcement bars, re bars, inside poured concrete.
- 7. Pre – tensionedconcrete In pre – tensioning system, the high- strength steel tendons are pulled between two end abutments (also called bulkheads) prior to the casting of concrete. The abutments are fixed at the end pre stressing bed Once the concrete attains the desires strength for pre stressing, the tendon are cut loose from the abutments. The pre stress is transferred to the concrete from the tendons, due the bond between them During the transfer of pre stress, the member undergoes elastic shortening. If the tendons are located eccentrically, the member is likely to bend and deflect (camber)
- 8. The various stagesof the pre-tensioning operation are summarized as follows : Anchoring of tendons Placing of against the end jacks abutments Cutting of the Applying tension tendons to the tendons Casting of concrete
- 11. Post – tensionedconcrete Post-tensioning is a method of reinforcing (strengthening) concrete or other materials with high-strength steel strands or bars, typically referred to as tendons Post-tensioning applications include office and apartment buildings, parking structures, slabs-on-ground, bridges, sports stadiums, rock and soil anchors, and water-tanks
- 14. Pre-tensioned Concrete Improvingthe performance of the building under various service condition. Allow to carry a greater load or span a greater distance then ordinary reinforce concrete. It permits steel to be used at stresses several times larger than those permitted for reinforcing bars
- 15. Post-tensioned Concrete Large reduction in traditional reinforcement requirements as tendons cannot distress in accidents Tendons can be easily "woven" allowing a more efficient design approach Higher ultimate strength due to bond generated between the strand and concrete Strong against compression
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