Download e-book for kindle: A Case for Partial Prestressing by Bruno Thürlimann (auth.)

By Bruno Thürlimann (auth.)

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4 P is ~ :;0. i 600cm \. _ A "s f*y - t:\s + A s fy f; 2 Influence of Degree of Prestress 3 = q* q*+q 4 A on Deflection Sem PARTIAL PRESTRESSING 295 The situation is however not cleared as far as the shear strength of partially prestressed concrete beams is concerned. Even in the case of reinforced concrete beams no generally accepted theoretical solution has been develop~d. Fig. he basis of the Swiss Specification- {7}. Again the arrows indicate that at the maximum value failure did not occur due to shear but some other cause.

E. at the time of form work removal without the influence of creep. Three different prestressing ratios p are investigated. The ratio p = 1 assumes that the total dead plus live load moment is balanced by the prestressing moment. The two dashed lines (p = 1; t = 0) and (p = 1; t= 00) give the dead load plus prestress deflection for the time t o and t = 00 respectively. It is clear that for a small dead to live load ratio this leads to 284 THÜRLIMANN -3 w(DU"'w(Pr) w(DL+LU o Dead Load h 4 Fig. 16 w(LL) +w(DU+ w(Prl w(DL+LL) o Live Load --- ...

An appropriate choice of a partial prestress leads to the smallest variation 6 between the two extreme deflection states. For ordinary reinforced concrete large pJsitive deflections accentuated by creep develop. Full prestress may produce large negative deflections mainly due to the influence of creep. Hence partial THÜRLIMANN 282 w(OL)+w(Pr) -3 DL; LL;Creep wo(DL+LL) Prestr. Moment M tPr)=-y: T -2 Prestr. Ratio: p = - M (Pr)/M(DL+LL) Creep Coefficient: cp = 2 2 3 4 Fig. 15 Deflection - Dead Load : lnfluence of Prestr: Ratio p PARTIAL PRESTRESSING prestressing 283 provides an effective means of favorably influ- encing and controlling the deflection of concrete structures.

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