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Structural Concrete - Hassoun

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766 Chapter 19 Introduction to Prestressed <strong>Concrete</strong><br />

Table 19.3<br />

Schematic<br />

Midspan Deflections of Simply Supported Beams<br />

Camber due to prestressing force<br />

Deflecion Equations<br />

Δ = (Fe)L2<br />

8EI<br />

(Horizontal tendons)<br />

(1)<br />

[<br />

Δ = FL2 5<br />

8EI 6 e 1 + 1 6<br />

2]<br />

e<br />

When e 2 = 0<br />

Δ = 5(Fe 1 )L2<br />

48EI<br />

[<br />

Δ = FL2 e<br />

8EI 1 + 4 ( ) a 2(e2<br />

− e<br />

3 L<br />

1 )]<br />

(2)<br />

(3)<br />

(4)<br />

When a = 1 3 L: (5)<br />

[<br />

Δ = FL2 e<br />

8EI 1 + 4 ( ) ]<br />

e2 − e<br />

27 1<br />

When a = 1 3 L and e 2 = 0<br />

Δ = 23(Fe 1)L 2<br />

216EI<br />

(6)<br />

Δ = FL2<br />

24EI [2e 1 + e 2 ] (7)<br />

When e 2 = 0:<br />

Δ = (Fe 1)L 2<br />

12EI<br />

(8)<br />

Deflection due to gravity loads<br />

Δ = 5wL4<br />

834EI<br />

Δ = PL3<br />

48EI<br />

(9)<br />

(10)

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