Figure 11-22.—Compound curve.QUESTIONSQ1. Using the data given for the compound curveshown in figure 11-22, compute the stations atPC1, PI1, PCC (point of compound curvature),PI2, and PT2.Q2. Referring again to figure 11-22, assume that youare tasked to stakeout the compound curve usingfull stations. What deflection angles (d1, d2, andd) and chord lengths (C1, C2, and C) will you usefor the 12° curve?Q3. Assume that you are to set half stations for a400-foot symmetrical vertical curve. The tan-gents (g1 = + 3.2 percent, g2 = –1.6 percent)intersect at Station 14 + 00. The tangent eleva-tion at the PVI is 131.20 feet. Compute the fol-lowing information for this curve:a. Elevation at the PVCb. Elevation at the PVTc .d.Grade elevation on the curve at the PVIGrade elevation on the curve at station13 + 50Station number and grade elevation on thee.curve at the turning pointQ4. Assume that you are to set half stations for a600-foot vertical curve. The tangents (g1 = –3percent, g2 = –8 percent) intersect at Station15 + 00, which has an elevation of 640 feet abovemean sea level. You may also assume thatl1 = 400 feet and l2 = 200 feet. Compute thefollowing information for this curve:a. Elevation at the PVCb. Elevation at the PVTc. Grade elevation on the curve at the PVId. Grade elevation on the curve at station13 + 50e. Station number and grade elevation on thecurve at the turning point11-21
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