Concept explainers
Repeat Problem 20-12, with the slab containing temperature steel in the form of welded wire mesh consisting of 0.125 in.2 steel/ft width. The modulus of steel, Es, is
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Chapter 20 Solutions
Traffic and Highway Engineering
- 27. Determine the thickness of rigid pavement of the proposed Nagtahan road to carry a max wheel load of 60 kN. Consider the effects of dowel at the center, fc’ = 20 MPa. Allowable tensile stress of concrete pavement is 0.06 fc’.arrow_forwardA slab with S/L = 0.40 has a thickness of 150 mm reinforced with 12 mm - diameter deformed bars at spacing s = 200 mm on center. Assume f'c = 28 MPa and fy = 415 MPa. Use clear cover of 20 mm. What is the safe live load in KN/m it could carry if L = 5 m?arrow_forwardA cantilever one-way slab having a length of 2.8m is reinforced with 12mm tension barsspaced at 150mm on center. Calculate the uniform live load the slab can carry using minimumconcrete cover, minimum slab thickness, fy = 345 MPa, and fc’ = 23 MPa. minimum concrete cover= 75mm minimum slab thickness= L/10arrow_forward
- The Advantages and disadvantages of Flat Slab Systemarrow_forwardDetermine the effective depth of a slab (mm) having thickness of 150mm with reinforcement bar diameter is 12 mm and uses the minimum clear concrete cover. Express your answer in a whole number.arrow_forwardDetermine the nominal flexural strength Mn of a 9-in-thick one-way slab reinforced with a single layer of No. 5 bars spaced 8 in on center (Grade 60). Assume d = 7.9 in and f'c = 4000 psiarrow_forward
- 10. Refer to Figure III-1 attached. What would be the required slab thickness according to the AASHTO 1972 design guide for the following conditions: Daily ESAL=2,000, 20-year design period, design working stress ft = 600 psi, and a modulus of subgrade reaction of 200 psi/in?a. 6.5b. 9.5c. 10.5d. 11.5arrow_forwardGiven a concrete pavement with a thickness of 8 in. (203 mm), a kvalue of 100 pei (37.1 MN/m³) doweled joints, and no concrete shoulders, determine the allowable repetitions under a 54-kip (240-kN) tridem-axle load based on erosion enteria. The Question is related to Highway and transportation Engineering.arrow_forwardDesign the one way slab using strength design method with the following data. Effective span=15 feet Fc=3000psi Fy=60000psi L.L=200 psf D.L=100 psf (Excluded self_wieght of slab)arrow_forward
- A four-lane northbound section of interstate has rigidpavement and was designed with a 8-inch slab,90% reliability, 700 lb/in2 concrete modulus of rupture,5 million lb/in2 modulus of elasticity, 3.0 load transfercoefficient, and an overall standard deviation of 0.3.The initial PSI is 4.6 and the TSI is 2.5. The CBR is 25with a drainage coefficient of 1.0. A design mistake was made that ignored 1000 total northbound (daily) passes of trucks with 22 kip single and 30 kip tandem axles. What slab thickness should have been used?arrow_forwardConsidering the rectangular section with the given concrete dimensions (in mm) shown below in Figure 2, design the given section, and draw its details, using the interaction diagrams stated in CSA A23.3, if the sectionis subjected to: a) Pf = 850 kN, Mf = 620 kN.m b) Pf = 2,150 kN, Mf = 465 kN.m given that fc’= 25 MPa and fy = 400 MPa and the concrete cover (dc) = 50 mmarrow_forwardA 6 m concrete slab of weight W is to be supported at one end by a steel rod 3 m long having a modulus of elasticity of 200000 MPa and the other end by an aluminum rod 4 m long with a modulus of elasticity of 70000 MPa. The lower ends of the rods are initially at the same level.1. Which of the following gives the ratio of the area of the aluminum rod to that of the steel rod so that the slab will remain level after it is attached to the rods? a. 2.81b. 3.81c. 1.81d. 4.812. Which of the following gives the elongation of the steel bar if it has a diameter of 25 mm when W = 30 kN. a. 0.46mmb. 0.66mmc. 0.56mmd. 0.76mm3. Which of the following gives the strain of the aluminum rod? a. 0.000215b. 0.000315c. 0.000115d. 0.00445arrow_forward
- Traffic and Highway EngineeringCivil EngineeringISBN:9781305156241Author:Garber, Nicholas J.Publisher:Cengage Learning