Example 2: A crest vertical curve joining a +3% grade and a -2% grade is to be designed for a two-lane highway with a design speed of 60 mph. If the tangents intersect at station (187+40.00) at an elevation of 180 ft., use the K-value to find the length of curve and determine the stations and elevations of the PVC. Also, find the location of the high point. Give: u 60 mph; G₁=+3.0 % %; G2=-2.0%; STAPVI = 187+40.00; Epv1 =180 ft.
Example 2: A crest vertical curve joining a +3% grade and a -2% grade is to be designed for a two-lane highway with a design speed of 60 mph. If the tangents intersect at station (187+40.00) at an elevation of 180 ft., use the K-value to find the length of curve and determine the stations and elevations of the PVC. Also, find the location of the high point. Give: u 60 mph; G₁=+3.0 % %; G2=-2.0%; STAPVI = 187+40.00; Epv1 =180 ft.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question

Transcribed Image Text:DRG PreAns
ns
of Int
no
300
÷
Rec Intg
PM Fri Feb 17
88 a 9
LCM
●
●
3.1 Handout
STApvc and Epvc
Xhigh and yhigh
Solution:
1) Determine Lmin
Example 2: A crest vertical curve joining a +3% grade and a -2% grade is to be designed for a
two-lane highway with a design speed of 60 mph. If the tangents intersect at station (187+40.00)
at an elevation of 180 ft., use the K-value to find the length of curve and determine the stations
and elevations of the PVC. Also, find the location of the high point.
Give: u-60 mph; G₁=+3.0 % %; G2=-2.0%; STAPVI = 187+40.00; EPVI =180 ft.
Find:
☆
3.1 Handout ✓
Design Speed (mi/h)
15
20
25
30
35
40
45
50
55
60
a. Lmin = KA 151 X5 755
i. K= 151
65
70
75
80
Table 3.2 Values of K for Crest Vertical Curves Based on Stopping Sight Distance
Rate of Vertical Curvature, K
X
T
80
115
155
Stopping Sight
Distance (ft)
200
250
305
360
425
495
570
645
730
820
910
Calculated
3.0
6.1
11.1
18.5
29.0
43.1
60.1
83.7
3.1
113.5
150.6
192.8
246.9
311.6
383.7
Design
3
7
12
19
29
44
61
84
sè
114
151
193
247
312
384
76%
+ x
...
Expert Solution

Step 1 Given data
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