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Forensic Engineering Fundamentals
book

Forensic Engineering Fundamentals

by Harold Franck, Darren Franck
December 2012
Beginner to intermediate content levelBeginner to intermediate
487 pages
17h
English
CRC Press
Content preview from Forensic Engineering Fundamentals
282 Forensic Engineering Fundamentals
e component of the weight in the same direction as friction is
W sinΦ
e centripetal acceleration component of the superelevated road is
aA
V
R
r
==co
s(
co
s)ΦΦ
2
Summing forces
fW WM
V
R
W
g
V
R
cossin co
sc
osΦΦ
ΦΦ
+= =
22
(9.170)
f
V
gR
+=
sin
cos
Φ
Φ
2
tan
sin
cos
Φ
Φ
Φ
===S Superelevation
Sf
V
gR
+=
2
S
V
gR
f=
2
(9.171)
Standard road design handbooks specify f as the side friction factor with a value of 0.16 for
speeds of 60 mph or less or 0.14 for 70 mph speeds. Additionally, the speed V earlier is to be
75% of the design speed. Equation 4.76 becomes negative for values of
f
V
gR
>
2
(9.172)
Since negative values of S mean that the superelevation ...
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Publisher Resources

ISBN: 9781439878392