Determine the stage of cracking moment of pre-stress, Civil Engineering

Determine the stage of Cracking moment of pre-stress

 At the stage of transfer of pre-stress in the pre-stressed beam element, only the pre-stressing force and the self weight of the beam may be assumed to act. At this stage, the beam soffit (bottom side) may be assumed to be under compression as the stresses, due to self weight only, are of low magnitude. As the extenal imposed loads are applied on the beam, the compressive stresses (due to pre- stressing) shall decrease due to the tensile stresses generated by external loads. A time comes when these stresses of opposite nature balance each other. At this stage, the soffit of the beam shall be subjected to zero stresses. If extenal loads are further increased, the soffit of the beam shall come under tension. At a particular value of tensile stress the concrete at the location of the soffit of the beam shall crack and visible cracks appear. This tensile stress, at this stage, may be taken to be equal to the modulus of rupture of concrete. The visible cracks have crack widths of the order of 0.01 - 0.02 mm.

 

Posted Date: 10/5/2013 2:23:02 AM | Location : United States







Related Discussions:- Determine the stage of cracking moment of pre-stress, Assignment Help, Ask Question on Determine the stage of cracking moment of pre-stress, Get Answer, Expert's Help, Determine the stage of cracking moment of pre-stress Discussions

Write discussion on Determine the stage of cracking moment of pre-stress
Your posts are moderated
Related Questions
The inner diameters of a sampling tube and that of a cutting edge are 70 mm and 68 mm correspondingly, their outer diameters are 72 and 74 mm respectively. Verify the inside cle

difference between compass suveying and chain surveying

Q. Explain Dissolved Impurities in water? The impurities which are caused by the action of water and water forming Acids with organic matter and carbon dio

Q. Write short notes on Abrasion Test? The abrasion test for ballast shall be carried out using Los-Angeles machine.The abrasive charge shall consist of 12 nos. cast iron or s

Explain the Equation for Length of Spiral Curve Length of Spiral Curve can be calculated using the following equation L s = 3.15V 3 /RC Where: V - Design Speed in MPH

Semi Dense Bituminous Concrete: Semi Dense Bituminous Concrete (SDBC) is similar to BC, but with a higher void content (5-10 per cent, as against 3-5 per cent in the case of

In order to make wise investments in a marketplace experiencing enhancing levels of risk, companies are turning to feasibility studies to verify if they should offer new products,

Define the proess of Eccentric Prestressing In this form of prestressing, the centroid of cross-sectional areas of tendons is not located at the centroid of the cross-section.

Q. The following observations were recorded in a Field density determination by sand-replacement method: Volume of Calibrating can = 1000 cm3 Weight of empty can = 10 N We