WorksheetsPrestressed Concrete Topic Deflection
Total questions: 3
Worksheet time: 21mins
Name
Class
Date
1.
A rectangular concrete beam of the cross section 150mm wide and 300 mm deep is simply supported over span of 8m and is prestressed with parabolic cable, e1 = 75mm at mid span and e2=25mm at supports. If prestressed force in cable is 350kN and the modulus of elasticity is 38kN/mm2. Given 20% losses, imposed load consist of 2kN/m finishes and 1kN/m variable load, and the creep factor = 2.0.
(a) Calculate and evaluate the short-term deflection.
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2.
From the above question Q1,
(b) Determine the concentrated load need to be imposed to the mid span beam to restore the deflection in (a) back to original level.
4 lines
3.
From question above,
(c) determine the long term deflection of the beam.
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100 %
