For the simply supported pre-tension member with 12m length as shown in the following Figure by taking the wd=7kN/m, wl = 15kN/m, fe' 40MPa, fpu =1200MPa, take the total losses of section as 15% and yc = 25kN/m³. Design for adequate section design (assume ws = 6kN/m, variable eccentricity). За Notes 1. For design of steel use α = (As x fy)/(0.85xfc'xb) 2. For prestress design With Variable (e) (1-R)Ms+Ma+M₁ S1≥ S2 ≥ Rfti-fes (1-R)M,+Ma+M₁ fts- Rfci C1 fcent fti- = (fri-fei) Pi = Ac⚫ \fcentl emax Aps = Pi (fcent-fei); fps Ms + Pi Pi emax
For the simply supported pre-tension member with 12m length as shown in the following Figure by taking the wd=7kN/m, wl = 15kN/m, fe' 40MPa, fpu =1200MPa, take the total losses of section as 15% and yc = 25kN/m³. Design for adequate section design (assume ws = 6kN/m, variable eccentricity). За Notes 1. For design of steel use α = (As x fy)/(0.85xfc'xb) 2. For prestress design With Variable (e) (1-R)Ms+Ma+M₁ S1≥ S2 ≥ Rfti-fes (1-R)M,+Ma+M₁ fts- Rfci C1 fcent fti- = (fri-fei) Pi = Ac⚫ \fcentl emax Aps = Pi (fcent-fei); fps Ms + Pi Pi emax
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:For the simply supported pre-tension member with 12m length as shown in the following
Figure by taking the wd=7kN/m, wl = 15kN/m, fe' 40MPa, fpu =1200MPa, take the total
losses of section as 15% and yc = 25kN/m³. Design for adequate section design (assume ws =
6kN/m, variable eccentricity).
За
Notes
1. For design of steel use α = (As x fy)/(0.85xfc'xb)
2. For prestress design With Variable (e)
(1-R)Ms+Ma+M₁
S1≥
S2 ≥
Rfti-fes
(1-R)M,+Ma+M₁
fts- Rfci
C1
fcent fti-
=
(fri-fei)
Pi = Ac⚫ \fcentl
emax
Aps
=
Pi
(fcent-fei);
fps
Ms
+
Pi Pi
emax
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