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(Solved): (a) In analysing prestressed concrete sections under working loads, briefly itemized any tive assum ...
(a) In analysing prestressed concrete sections under working loads, briefly itemized any tive assumptions you will make? [5 nuarks] (b) A prestressed concrete beam supports an imposed load of 5kN/m over a simply supported span of 10m. The beam has an I-section with an overall depth of 450mm. The thickness of flange and web are 75mm and 100mm respectively. The width of the flange is 230mm (Fig. Q2). The beam is to be prestressed by an effective prestressing force of 350kN at a suitable eccentricity such that the resultant stress at the soffit of the beam at the centre of the span is zero. Find the escentricity required for the force. A lso, find the magnitude of prestressing force for the resultant stress to be zero at mid-span if the tendons are concentric. (Unit weight of concrete =24kN/m3 ) [15marks] ection modulis. =T/y?=2tPne??+2tMg??+2tMq??+2bPuc???2bMj???2bMq??? Fig. Q2