Question

Campute Simply Supprted pre stressal concrete gixden of 12m spanlo-5m)breadth and .ln depth (depp -tm) Bottom allowable Stresses oure to be satisfied accarding Knowaing that C fes o45 Pa,steel Leadons is(g00mmy, secuce stress after lesses is 2oa Mpa sunit weiaht af cancnte is 25 kN/m and feis 4o Mpa the allowab le unifarm service lagd Par ACE reeirement area ,

Answer 1

500 Solution 550 1100 1200 Nlm a5 K m 450 40 MPa Ot450mm Apt Boomm loo P = 0-xAn 120D X800 960000 一12m P 960 KN the bottom fibre i gven E ffective stros at Pey P My I A Self-Wleight of conc rete beam 05ooxd X25 (Deal load) ラ13-75X103 1375 KN Service load (Live load () M=(W+1375)し2 /8 PUt all valwe in Service strers Connidercl If 「1200 m Pa ム (1a75t la22 8 x 500x io003 960XIOOD 1200 X12 X550 xt 50ox lo00 500X 1100 12 (1375 Tu) X0-237 (1375x1o+x02276+ 5:7024 1200= 74 6 5.7024 1200 74 W-18.769 KN Acting ubuword)