What is the basic principle of Prestressed concrete?

What is the basic principle of Prestressed concrete?
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1 Answer

Answer :

Principle: The compressive stresses induced by high strength steel tendons in a concrete member before the application of load, will balance the tensile stresses imposed in the member during its service.
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Related questions

State the advantages and disadvantages of prestressed concrete.

Description : State the advantages and disadvantages of prestressed concrete.

Last Answer : Advantages: 1. The c/s ismore efficiently used in fully prestressed members. 2. Dead loads are reduced considerably. 3. Improved shear resistance, due to the effect of compressive prestress, ... cube strength of 35 N/mm2 for Posttensioned system and 45 N/ mm2 for pretensioned system.

Justify the necessity of use of high-grade materials in prestressed concrete.

Description : Justify the necessity of use of high-grade materials in prestressed concrete.

Last Answer : 1) If mild steel is used, the working stress in it (i.e. 140 N/mm2) is more or less completely lost due to elastic deformation, creep and shrinkage of concrete. 2) The ... structural elements. With reduced dead weight of the material, larger spans become technically and economical practicable. 

Define Prestressed concrete and state types of prestressing steel.

Description : Define Prestressed concrete and state types of prestressing steel.

Last Answer : Prestressed concrete: Prestressed concrete is basically a concrete in which internal stresses of a suitable magnitude and distribution are deliberately introduced so that the stresses resulting from external loads are ... 1962, and. 4) Uncoated stress relieved strand conforming to IS: 6006-1970. 

State any four advantages and four disadvantages of precast concrete.

Description : State any four advantages and four disadvantages of precast concrete.

Last Answer : Advantages: 1. Very rapid speed of erection 2. Good quality control 3. Entire building can be precast-walls, floors, beams, etc. 4. Rapid construction on site 5. High quality because of ... is required in the application of the panel on site. 11. Cranes are required to lift panels.

State any two names of materials used in precast concrete

Description : State any two names of materials used in precast concrete

Last Answer : 1. Cement 2. Sand 3. Steel 4. Water 5. Polystyrene 6. Fly ash. 7. Ground granulated blast furnace slag

For what type of structures do you recommend post-tensioning?

Description : For what type of structures do you recommend post-tensioning?

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Explain freyssinet system of prestressing with respect to process and application with sketches.

Description : Explain freyssinet system of prestressing with respect to process and application with sketches.

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Depict the effect of pre-fabricated building on the surrounding environment with respect to noise pollution, staking at elements and transportation.

Description : Depict the effect of pre-fabricated building on the surrounding environment with respect to noise pollution, staking at elements and transportation. 

Last Answer : Noise pollution is the serious or more noise that may damage the activity or human life. The contribution of most outside noise is mainly due to building activities. Noise pollution affects both health and ... iv) Sleep interference v) Habit of talking loudly vi) Hearing loss vii) Concentration

Illustrate cable profiles for eccentric straight and parabolic cables with sketches.

Description : Illustrate cable profiles for eccentric straight and parabolic cables with sketches. 

Last Answer : i) Eccentric straight cable profile: The stress due to prestressing alone are generally combined stresses due to the action of direct load bending from an eccentrically applied load. In this case, the load is ... section as shown in the figure below. ii) Parabolic cable profile

Explain the loss of prestress due to friction and slip of anchorage and state two remedial measures to avoid them.

Description : Explain the loss of prestress due to friction and slip of anchorage and state two remedial measures to avoid them.

Last Answer : Loss due to Friction: This loss occurs only in post-tensioned members. There always exists a certain amount of friction in the jacking and anchoring system and on the walls of the duct. So, ... over-extending the tendon in the prestressing operation by the amount of the draw - in before anchoring

Explain any one method of Prefab system.

Description : Explain any one method of Prefab system.

Last Answer : Prefab system: It refers to any part of a building that has been fabricated at a place other than its final location. For this reason, it can be referred to by other names such as off-site fabrication, ... If you need further assessing, feel free to contact us; your needs are all that matter to us.

Explain the procedure of the storage, transportation and erection of prefabricated building elements.

Description : Explain the procedure of the storage, transportation and erection of prefabricated building elements. 

Last Answer : Storage of pre-fabricated building elements: 1) Procurement storage of Unloading raw materials 2) Testing of raw materials 3) Design of concrete mix 4) Fabrication of reinforcement cages 5) ... differs with risk condition, hence skilled foremen, and workers to be employed on the job.

Explain determination of Water absorption of paver block and state acceptable limits as per IS.

Description : Explain determination of Water absorption of paver block and state acceptable limits as per IS. 

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Describe with sketch any two joints in doors and window frame.

Description : Describe with sketch any two joints in doors and window frame.

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Describe any two design considerations for Precast Canal lining.

Description : Describe any two design considerations for Precast Canal lining.

Last Answer : 1. Precast concrete slabs, laid properly on carefully prepared sub-grades and with the joints, effectively sealed, constitute a serviceable type of lining. The precast slabs are about 5 to ... . However, seepage losses are obviously more. Transportation of precast slabs may contribute to breakage. 

State cable profile in simply supported rectangular beam section.

Description : State cable profile in simply supported rectangular beam section.

Last Answer : Cabe profile: In a prestressed concrete member, external type of loads is balanced by transverse component of suitable cable profile, on effect of loading the net deformation increases the stress, strain and length of the tendon, extension of tendon, increase in strain, increase in stress.

List the various types of losses of prestress in pretensioned pre-stressed member.

Description : List the various types of losses of prestress in pretensioned pre-stressed member.

Last Answer : i. Elastic shortening ii. Shrinkage of concrete iii. Creep of concrete iv. Relaxation of steel

Define Modules and modular co-ordination

Description : Define Modules and modular co-ordination

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State any four precast non-structural components that can be used for speedy construction.

Description : State any four precast non-structural components that can be used for speedy construction.

Last Answer : 1. Architectural Precast 2. Insulated Architectural Cladding 3. Insulated Wall Panels 4. Column Covers 5. Precast Concrete Light Wall 6. Precast Concrete Spandrels 7. Precast Concrete Solid Walls 8. Stormwater Deflector 9. Façade 10. Concrete panels for partition walls 11. Concrete planks

A prestressed concrete section is said to have failed in strength at the moment when all the material in the section has exhausted its (a) Stress limitations (b) Strain limitations (c) Stress as well as strain limitations (b) Laad limitations

Description : A prestressed concrete section is said to have failed in strength at the moment when all the material in the section has exhausted its (a) Stress limitations (b) Strain limitations (c) Stress as well as strain limitations (b) Laad limitations

Last Answer : (a) Stress limitations

Inc case of prestressed concrete members, the bursting stresses develop at (a) Bond zone (b) Maximum bending moment zone (c ) Maximum shear stress zone (d) Anchorage zone

Description : Inc case of prestressed concrete members, the bursting stresses develop at (a) Bond zone (b) Maximum bending moment zone (c ) Maximum shear stress zone (d) Anchorage zone

Last Answer : (d) Anchorage zone

In prestressed concrete members, the shear force depends upon (a) Distributed load (b) Torsion (c) Concentrated load (d) Variation in net bending moment

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Last Answer : (d) Variation in net bending moment

In a curved prestressed bridge, how should the guided bearings in piers of the curved region be oriented with respect to the fixed bearing in abutment?

Description : In a curved prestressed bridge, how should the guided bearings in piers of the curved region be oriented with respect to the fixed bearing in abutment?

Last Answer : To determine the orientation of guided bearings, one should understand the movement of curved region of a prestressed bridge. Movement of prestress and creep are tangential to the curvature of the ... large, temporary freedom of movement at the guided bearings has to be provided during construction.

For a certain set of external loads, concordant profile in a prestressed beam represents to some scale the (a) Influence line diagram (b) Shear force diagram (c) Bending moment diagram (d) Williot-Mohr diagram

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A simply supported rectangular beam is uniformly loaded and is prestressed. The tendon provided for prestressing should be (a) Straight, above centroidal axis (b) Straight, below centroidal axis (c) parabolic, with convexity upward (d) Parabolic, with convexity downward

Description : A simply supported rectangular beam is uniformly loaded and is prestressed. The tendon provided for prestressing should be (a) Straight, above centroidal axis (b) Straight, below centroidal axis (c) parabolic, with convexity upward (d) Parabolic, with convexity downward

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Discuss the advantages and limitation of prestressed bridge.

Description : Discuss the advantages and limitation of prestressed bridge.

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State principle of ultrasonic pulse-velocity test on concrete.

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Basic Concrete Repair Information?

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