Residential Construction Academy: House Wiring (MindTap Course List)
5th Edition
ISBN: 9781337402415
Author: Gregory W Fletcher
Publisher: Cengage Learning
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Question
Chapter 2, Problem 9RQ
To determine
The four raceway types described in the chapter that could be used in residential wiring.
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+150+
Assignment
SW+ SLAB
SDL =
250
150
- 3.3 kPa
укра
LL = 3 kPa
3
୪
8c = 23.6 kN/m²
P = 3000 KN
loss,
=
9%
Coss = 20%
LBEAM = 9m
COMPUTE AND DRAW THE STESS DIAGRAM (TRIBUTARY WIDTH=
600m
350mm
FIND:
f TOP & BOTTOM
fe = 35Mpa
100mm f'c = 42.5 MPa
218
5m)
EC = 4700 √ fc
(MPa)
(Initial, Const. phase, final stage)
Design a cantilevered rectangular RC beam subjected to a maximum factored load bending
moment, M u = 260 kip-ft. The clear height requirements for the building limits the total beam depth
to 22 in. Determine the beam width and the steel design. Use f c’ = 6,000 psi, f y = 40,000 psi. The
grade beam is cast against earth and permanently in contact with soil.
a. Assume an initial steel ratio or beam width.
b. Set up the bending design equation.
c. Solve for either the steel ratio or the beam width.
d. Design needed steel.
2
Hint: Knowing “h”, one can estimate the “d” value. So, two remaining variables can be estimated.
There are many acceptable solutions. You can either assume a steel ration and solve for width “b”,
or assume a beam width “b” and solve for the steel ratio. Remember that a good beam aspect ratio
(d/b) is approximately 2.0
A 15 in. x 26 in. rectangular RC beam (shown in figure below) supports a service uniform dead
load of 1.3 kip/ft and a service uniform live load of 1.6 kip/ft. The dead load includes the beam’s
self-weight. Design the reinforcement required for maximum moments and show the design in
sketches. Use f c ’ = 4,000 psi and f y = 60,000 psi. The beam is used in an open parking garage and
is exposed to weather.
a. Find factored maximum bending moments.
b. Design for max. negative moment.
c. Design for max. positive moment.
Hint: Assume an initial beam shape (b, d), then solve for the needed reinforcements at the maximum
negative and positive factored bending moments. This is like the class example.
Chapter 2 Solutions
Residential Construction Academy: House Wiring (MindTap Course List)
Ch. 2 - Name the size of machine screw that is used to...Ch. 2 - Prob. 2RQCh. 2 - Describe when an electrician would use a new work...Ch. 2 - Name and describe three cable types that can be...Ch. 2 - Name the system that is used to size the...Ch. 2 - Prob. 6RQCh. 2 - Describe how an electrician can tell Type AC and...Ch. 2 - Prob. 8RQCh. 2 - Prob. 9RQCh. 2 - Prob. 10RQ
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