Fundamentals Of Construction Estimating
4th Edition
ISBN: 9781337399395
Author: Pratt, David J.
Publisher: Cengage,
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Fundamentals Of Construction Estimating
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- Traffic flow on a three-lane (one direction) freeway can be described by the Greenshields model. One lane of the three lanes on a section of this freeway will have to be closed to undertake an emergency bridge repair that is expected to take 2 hours. It is estimated that the capacity at the work zone will be reduced by 30 percent of that of the section just upstream of the work zone. The mean free flow speed of the highway is 70 mi/h and the jam density is 150 veh/mi/In. If it is estimated that the demand flow on the highway during the emergency repairs is 85 percent of the capacity, using the deterministic approach, determine the following. (a) the maximum queue length (in veh) that will be formed veh (b) the total delay (in h) h (c) the number of vehicles that will be affected by the incident veh (d) the average individual delay (in min) minarrow_forwardNon-constant sections are used in bridges without changing the appearance of the bridge significantly. Refer to the figure below. Compute the ratio of moment inertial after to before of the plate girder shown (greater than 1). A 10x0.5" steel plate of the same grade as the plate girder and is fillet welded to the flangesarrow_forward8-18. Determine the vertical displacement of joint C if member CD is fabricated 10 mm too long. 4m D E B Carrow_forward
- 8-17. Determine the vertical displacement of joint C if members AB and BC experience a temperature increase of ST = 50°C. Take a = 12(10-6)/°C. A 4 m E 4 m 4 m B Darrow_forwardPlease solve all pointsarrow_forwardFor the I section prestressed concrete beam with a straight tendon shown in Fig below which is under the prestressing force, and U.D.L. Analyze the stresses at Mid- span at: A- transfer stage (due to initial prestress P. and self weight wo) B- at service stage. (due to effective prestress Pe and full loads) Check stresses with the ACI permissible stresses. Given: Initial prestress force Pi = 750 kN Effective prestress force Pe = 640 kN Wo (self) = 2.7 kN/m = W (D+L) 8 kN/m e = 130 mm I 5 10 mm² fci = 25 MPa (at transfer age), f' = 35 MPa (at service age) ASECTION 114 000 mm² W=4.75 kN/m |- 12 m F I 610mmarrow_forward
- Kindly help to provide explanation, examples and provide any useful link for citations and learning purposes. This is regarding building diagnosis.arrow_forwardDescribe the scientific of the arrival of enslaved Africans in America and how it has impacted American societyarrow_forwardFor the beam of cross section shown below, analyze the stresses at Mid-span at transfer and at service stages, Neglect losses. Use: f' =41.4 MPa and assume that concrete has attained strength of fci =34.5 MPa at the time of transfer. The initial prestress force is (Psi-1112 kN). The service deal load D.L = 3.65 kN/m (not include self weight of beam). The service live load L.L=14.6 kN/m. Use n=7. Check stresses with the ACI permissible stresses Determine the equivalent transformed section in compute A and I h=508 mm d=381 9.15 As= 1290 mm² 305arrow_forward
- For the prestressed concrete beam with a straight tendon shown in Fig below which is under the prestressing force of 1620 kN, Analyze the stresses at Mid-span at transfer stage. The uniformly distribution load (self weight) = 4.75 kN/m. Then draw the stress distribution across the section mid-span. W=4.75 kN/m Δ 7.3 m F= 1620 kN 750 mm I 230 mm 500 mmarrow_forward4.36 A pipe slopes upward in the direction of liquid flow at an angle of 30° with the horizontal. What is the pressure gradient in the flow direction along the pipe in terms of the specific weight of the liquid, y, if the liquid is decelerating (accelerating opposite to flow direction) at a rate of 0.3 g?arrow_forward4.25 In this flow passage, the velocity is varying with time. The velocity varies with time at section A-A as 4m V-41/1-230/1 2.25- S to At time t = 0.50s, it is known that at section A-A the velocity gradient in the s direction is +2.1 m/s per meter. Given that to is 0.6 s and assuming quasi-1-D flow, answer the following questions for time t = 0.5 s: a. What is the local acceleration at A-A? b. What is the convective acceleration at A-A? A Diameter 50 cm Problem 4.25arrow_forward
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