Architectural Drafting and Design (MindTap Course List)
7th Edition
ISBN: 9781285165738
Author: Alan Jefferis, David A. Madsen, David P. Madsen
Publisher: Cengage Learning
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Chapter 3, Problem 3.7Q
To determine
The definitionof building model.
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A double-T simply supported concrete beam its cross section is shown in
Figure, is prestressed with 2 tendons each 400 mm². Determine the allowable
service load.
Use span 12 m, fse = 1300 MPa, fc = 40 MPa, y = 25 kN/m³.
=
1200 mm
>09<
*100*
As = 400
+100+
As = 400
400
1400+
A prestressed simply supported 15 m span beam with rectangular box section is post-tensioned by
straight high tensile steel wires as shown in Figure. The prestressing wires are placed at the center
line of the flanges and initially stressed to 850 N/mm². The beam is required to carry a uniformly
distributed superimposed load of 4.5 kN/m in addition to its weight. If the concrete stresses are not
to exceed 17 MPa in compression and 1 MPa in tension at service stage, calculate the range of the
total prestressing wires area required. Ignore prestressing force losses in your answer. (Ye
kN/m³).
= 24
2As
400
As
80
80;
750
A simply supported rectangular prestressed concrete beam, of span 13 m and its cross section as
shown in figure, is carrying a live load equals to 30 kN/m in addition to its weight, compute the
following stresses and compare it with ACI allowable stress:
a) Bottom fiber stress at support in initial stage.
b) Top fiber stress at mid span in final stage.
Use y = 24 kN/m³, As = 600 mm², initial stress of the prestressed steel = 1200 MPa, total losses
is 20%, fci = 22 MPa, and fo' = 28 MPa
800 mm
3 As
400 mm
As
340 mm
340 mm
Chapter 3 Solutions
Architectural Drafting and Design (MindTap Course List)
Ch. 3 - Prob. 3.1QCh. 3 - Prob. 3.2QCh. 3 - Prob. 3.3QCh. 3 - Prob. 3.4QCh. 3 - Prob. 3.5QCh. 3 - Prob. 3.6QCh. 3 - Prob. 3.7QCh. 3 - Prob. 3.8QCh. 3 - Prob. 3.9QCh. 3 - Prob. 3.10Q
Ch. 3 - Prob. 3.11QCh. 3 - Prob. 3.12QCh. 3 - Prob. 3.13QCh. 3 - Prob. 3.14QCh. 3 - Prob. 3.15QCh. 3 - Prob. 3.16QCh. 3 - Prob. 3.17QCh. 3 - Prob. 3.18QCh. 3 - Prob. 3.19QCh. 3 - Prob. 3.20QCh. 3 - Prob. 3.21QCh. 3 - Prob. 3.22QCh. 3 - Prob. 3.23QCh. 3 - Prob. 3.24QCh. 3 - Prob. 3.25QCh. 3 - Prob. 3.26QCh. 3 - Prob. 3.27QCh. 3 - Prob. 3.28QCh. 3 - Prob. 3.29QCh. 3 - Prob. 3.30QCh. 3 - Prob. 3.31QCh. 3 - Prob. 3.32QCh. 3 - Prob. 3.33QCh. 3 - Prob. 3.34QCh. 3 - Prob. 3.35QCh. 3 - Prob. 3.36QCh. 3 - Prob. 3.37QCh. 3 - Prob. 3.38QCh. 3 - Prob. 3.39QCh. 3 - Prob. 3.40QCh. 3 - Prob. 3.41QCh. 3 - Prob. 3.42QCh. 3 - Prob. 3.43QCh. 3 - Prob. 3.44QCh. 3 - Prob. 3.45QCh. 3 - Prob. 3.46QCh. 3 - Prob. 3.47QCh. 3 - Prob. 3.48QCh. 3 - Prob. 3.49QCh. 3 - Prob. 3.50QCh. 3 - Prob. 3.51QCh. 3 - Prob. 3.52QCh. 3 - Prob. 3.53QCh. 3 - Prob. 3.54QCh. 3 - Prob. 3.55QCh. 3 - Prob. 3.56QCh. 3 - Prob. 3.57QCh. 3 - Prob. 3.58QCh. 3 - Prob. 3.59QCh. 3 - Prob. 3.60QCh. 3 - Prob. 3.61QCh. 3 - Prob. 3.62QCh. 3 - Prob. 3.63QCh. 3 - Prob. 3.64QCh. 3 - Prob. 3.65QCh. 3 - Prob. 3.66QCh. 3 - Prob. 3.67QCh. 3 - Prob. 3.1PCh. 3 - Prob. 3.2PCh. 3 - Prob. 3.3PCh. 3 - Prob. 3.4PCh. 3 - Prob. 3.5PCh. 3 - Prob. 3.6PCh. 3 - Prob. 3.7PCh. 3 - Prob. 3.8PCh. 3 - Prob. 3.9PCh. 3 - Prob. 3.10PCh. 3 - Prob. 3.11PCh. 3 - Prob. 3.12PCh. 3 - Prob. 3.13PCh. 3 - Prob. 3.14PCh. 3 - Prob. 3.15PCh. 3 - Prob. 3.16PCh. 3 - Prob. 3.17PCh. 3 - Prob. 3.18PCh. 3 - Prob. 3.19PCh. 3 - Prob. 3.20P
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