Chapter 12365P12.40When the concrete has cured and the pre-stressing tension has been released, the rod presses in onthe concrete and with equal force, T2, the concrete produces tension in the rod.(a)In the concrete: stress =×=⋅=FHGIKJ800 106. Nmstrain2YYLLiaf∆Thus, ∆LLYi==××stressNmm22afejaf15030 0 1069...or∆L=−400 1004004m mm.(b)In the concrete: stress ×TAc26Nm2, soT2648 00 1050 0 1040 0×=−.mkN22ej(c)For the rod: TALLYRi2=FHGIKJ∆steelso ∆LTLAYiR=2steel∆L=×××=−−150 10200 1020044103N mNmmmej(d)The rod in the finished concrete is 2.00 mm longer than its unstretched length. To removestress from the concrete, one must stretch the rod 0.400 mm farther, by a total of 240mm.(e)For the stretched rod around which the concrete is poured:TALLYTLLTiR11130240 101 50 1020 0 1048 0=FHGIKJ=FHGIKJ=×FHGIKJ=−−∆∆totalsteeltotalsteelorm1.50 mNmkN..ej*P12.41With
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .