Materials Science And Engineering
10th Edition
ISBN: 9781119405498
Author: Callister, William D., Jr, RETHWISCH, David G., Jr., 1940- Author.
Publisher: Wiley,
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Consider a constant area semi-infinite fin of a circular cross section of radius r. and thermal conductivity
k. The base is maintained at T. and the surface of the fin exchanges heat by convection to an ambient
fluid at T with a heat transfer coefficient h. It is desired to increase the heat transfer from the fin. The
following suggestions are made: (i) doubling k, (ii) doubling ro, (iii) doubling h. Which suggestion will
bring about the largest increase in heat transfer?
To
x
h, T
C
A
h, T
PROBLEM: Design the transversely reinforced concrete deck slab shown
in the cross-sectional detail below.
8" REINFORCED
CONCRETE SLAB
1/4" PER FT.
T
3-3%
8'-0"
8'-0"
4'-0"
GIVEN:
Bridge to carry two traffic lanes.
Concrete strength =4.5 ksi.
Grade 60 reinforcement f, = 60 ksi.
Account for 25 psf future wearing surface.
Assume stringers are W36 x 150.
Deck has a 0.5 in integrated wearing surface.
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