Q.1 A post-tensioned prestressed concrete beam with T-section in a footbridge is as shown in Figure Q1. It is simply sup

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Q 1 A Post Tensioned Prestressed Concrete Beam With T Section In A Footbridge Is As Shown In Figure Q1 It Is Simply Sup 1 (68.96 KiB) Viewed 27 times

Q.1 A post-tensioned prestressed concrete beam with T-section in a footbridge is as shown in Figure Q1. It is simply supported with span of 10.0 m and designed to carry a service load of 25.0 kN/m. Short-term prestress loss is 10% and long-term loss is 20%. (a) (b) (c) so↑ 350 300 700 Figure 01 1200 100 Calculate the cross-sectional area, centroid (measured from bottom of beam) and major moment of inertia of the beam section. (3 marks) Calculate the maximum permissible prestressing force so that the following allowable concrete stress limits would not be exceeded: Allowable stresses at transfer: f'max = 17 N/mm² and f min = -1 N/mm² Allowable stresses at service stage:fmax = 10 N/mm² and fmin = 0 N/mm² (14 marks) Based on the prestressing force calculated in (b), find the extreme fibre (top and (6 marks) bottom) stresses at transfer and service stages respectively.