Structural Analysis
Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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Question

A crest vertical curve joining a + 3 percent and – 4 percent grade is to be designed for 75 mph. If the tangent intersect at station (345 + 6000) at an elevation of 250 ft, determine the stations and elevations of the PVC and PVT. 

a Design speed (km/h) 20 30 40 50 60 70 80 90 100 110 120 130 Stopping sight distance (m) 20 35 50 65 85 Metric 105 130 160 185 220 250 285 Rate of vertical curvature, Ka Calculated 0.6 1.9 3.8 6.4 11.0 16.8 25.7 38.9 52.0 73.6 95.0 123.4 Design 1 2 NALITESERIEN 15 20 25 30 35 40 45 50 55 60 65 70 75 m 4 7 11 17 26 39 52 74 95 Design speed (mph) 124 80 US Customary Stopping sight distance (ft) 80 115 155 200 250 305 360 425 495 570 645 730 820 910 Rate of vertical curvature, Ka Calculated 3.0 6.1 11.1 18.5 29.0 43.1 60.1 83.7 113.5 150.6 192.8 246.9 311.6 383.7 Rate of vertical curvature, K, is the length of curve per percent algebraic difference in intersecting grades (A). K = L/A Design 3 7 12 19 29 44 61 84 114 151 193 247 312 384 Exhibit 3-76. Design Controls for Stopping Sight Distance and for Crest and Sag Vertical Curves
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Transcribed Image Text:a Design speed (km/h) 20 30 40 50 60 70 80 90 100 110 120 130 Stopping sight distance (m) 20 35 50 65 85 Metric 105 130 160 185 220 250 285 Rate of vertical curvature, Ka Calculated 0.6 1.9 3.8 6.4 11.0 16.8 25.7 38.9 52.0 73.6 95.0 123.4 Design 1 2 NALITESERIEN 15 20 25 30 35 40 45 50 55 60 65 70 75 m 4 7 11 17 26 39 52 74 95 Design speed (mph) 124 80 US Customary Stopping sight distance (ft) 80 115 155 200 250 305 360 425 495 570 645 730 820 910 Rate of vertical curvature, Ka Calculated 3.0 6.1 11.1 18.5 29.0 43.1 60.1 83.7 113.5 150.6 192.8 246.9 311.6 383.7 Rate of vertical curvature, K, is the length of curve per percent algebraic difference in intersecting grades (A). K = L/A Design 3 7 12 19 29 44 61 84 114 151 193 247 312 384 Exhibit 3-76. Design Controls for Stopping Sight Distance and for Crest and Sag Vertical Curves
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