A prestressed concrete beam 221mm x 703mm has the following service loadings PDL-40 kN PLL=42 kN wDL=9 kN/m wLL=13 kN/m Loss of prestress at service loads is 18 % Throughout the span, the tendons are located 70 mm below the N.A. If the allowable compressive stress is 15.75 MPa and the allowable tensile stress is 2.96 MPa, and considering the point of maximum moment, calculate the required Prestressing force in kN. POL, PL 5m WDL, WLL WLL 16m B

A prestressed concrete beam 221mm x 703mm has the following service loadings PDL-40 kN PLL=42 kN wDL=9 kN/m wLL=13 kN/m Loss of prestress at service loads is 18 % Throughout the span, the tendons are located 70 mm below the N.A. If the allowable compressive stress is 15.75 MPa and the allowable tensile stress is 2.96 MPa, and considering the point of maximum moment, calculate the required Prestressing force in kN. POL, PL 5m WDL, WLL WLL 16m B

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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REINFORCED CONCRTE DESIGN
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Determine the required tension steel area of the T beam with given properties below. Width of flange bf = 500 mm Width of web bw = 340mm Thickness of flange tf = 140 mm Effective depth d = 350 mm Effective concrete covering d' = 75 mm Compressive strength of concrete fc' = 34.5 MPa Yield stress of steel bar fy = 375 MPa Mu = 415 kN-m As = mm2
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Determine the required tension steel area of the T beam with given properties below. Width of flange bf = 500 mm Width of web bw = 340 mm Thickness of flange tf = 140 mm Effective depth d = 350mm Effective concretee covering d' = 75mm Compressive strength of concrete fc' = 34.5 MPa Yield stress of steel bar fy = 375 MPa Mu = 415 kN-m As = _________ mm2
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A pre stressed concrete beam has a width of 200 mm and an overall depth of 400 mm. The permissible stresses in tension and compression due to pre- stressing alone are 4 N/mm and 25 N/mm respectively. Find the required pre- stressing force in the tendon and the eccentricity of the tendon, if a straight tendon with a constant eccentricity is to be provided in the beam. No external load or self weight effect is to be considered.
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