Chapter 10, Problem 10.15QPP

Question 6 The following figure shows peak-hour volumes for an intersection. Using Webster's method, determine a suitable signal timing for the intersection using the four-phase system shown below. Use an amber interval of 3 seconds and the saturation flow given in the table. O 100 O Phase Lime Group Saturation Flow A e 1615-> 370 3700 B 1615 1615 3700 1615 3700

PHF-0.91 Pedestrian volume is negligible. Question 7 A parking area with 60 bays has an initial count of 35 vehicles. The in-out survey data for 10-minute intervals is as per the table below. Complete the table, calculate the accumulation, occupancy (%), and parking load (veh.hrs) for each interval. Time (min) In Out Accumulation Occupancy Parking load (%) 0 3 10 2 4 20 1 1 30 1 3 40 1 6 50 1 4 60

Q3/ The following data represent the water depth in the soil of equal areas for specified field. Calculate the uniformity coefficient, efficiency and adequacy of irrigation. Net needed irrigation depth =75 mm (78-04, 79, 88, 85.21, 76,82)

A (A) Q1/ It is required to apply a net depth of 120mm to a total area of 60 ha. The applied discharge is continuously 180 L/s. What must be the time of irrigation? Assume the application efficiency 85%. а Eas 85 0% t

The following figure is a flexible pavement system with the resilient moduli layer coefficients and drainage coefficients as shown. If the predicted ESAL = 6x106, Reliability, R = 99%, Standard Deviation (So) = 0.45, and APSI = 2.5, select thicknesses D1, D2, and D3 in accordance with the AASHTO Guide for Design of Pavement Structures. E₁ = 400, 000 psi; a₁ = 0.42, Thickness = D₁ E₂=30,000 psi; a₂= 0.14, m₂ = 1.2; Thickness = Dz E=11,000 psi; a=0.08, m3 = 1.2; Thickness = D3 MR= 5,700 psi

Diagramtically show the placement, size, and spacing of temperature steels, dowel bars and tie bars in rigid pavements. Also mention their puproses in rigid pavements.

A six-lane concrete roadway is being designed for a metropolitan area. This roadway will be constructed on a subgrade with an effective modulus of subgrade reaction k of 200 lb/in^3. The ESALs used for the design period is 6.0×10^6. Using the AASHTO design method, determine a suitable thickness of the concrete pavement (to the nearest 1/2 inch), provided that the working stress of the concrete to be used is 600 lb/in^2 and the modulus of elasticity is 6×10^6 lb/in^2. Assume the initial serviceability is 5.0 and the terminal serviceability is 2.0. Assume the overall standard deviation, So, is 0.35, the load transfer coefficient J as 3.2, the drainage coefficient, Cd, is 1.15, and R = 99%.

A 12-in. full-depth asphalt pavement is placed on a subgrade with aneffective roadbed resilient modulus of 7,000 psi. Assuming a layer coefficient of 0.44 for the hot mix asphalt, a drop in PSI from 4.5 to 2.5, an overall standard deviation of 0.49, and a predicted ESAL of 10 X 10^6, determine the reliability of thedesign by using the AASHTO equation and check the result by using the AASHTO design chart

Given the monthly resilient modulus below, find out relative damage of each month, the average relative damage and the effective roadbed resilient modulus.Month Resilient Modulus (psi):Jan  20,000Feb  22,000March  5,000April  6,000May  7,000June  8,000July  8,500August  9,500September  9,000October  8,000November  7,000December 18,000