Materials for Civil and Construction Engineers (4th Edition)
Materials for Civil and Construction Engineers (4th Edition)
4th Edition
ISBN: 9780134320533
Author: Michael S. Mamlouk, John P. Zaniewski
Publisher: PEARSON
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Chapter 10, Problem 10.18QP
To determine

The typical load duration of wood structure and the percent of increase or decrease of the allowable fiber stress for a one-week event.

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Oil of specific gravity 0.800 acts on a vertical triangular area whose apex is in the oil surface. The triangle is 9 ft high and 12 ft wide. A vertical rectangular area 8 ft high is attached to the 12-ft base of the triangle and is acted upon by water. Find the magnitude and position of the resultant force on the entire area.
What types of constraints did Covid-19 cause in duration of activities on different construction projects?
Post-tensioned AASHTO Type III girders are to be used to support a deck with unsupported span equal to 90 feet. One level of Grade 270, 10 x 0.6" Ø 7-wire strand are used to tension the girders. The girder is simply supported at both ends. The anchors are located 2" from the neutral axis at the supports while the eccentricity is measured at 14" at the midspan. Use maximum values for ranges (table values). The tendons are encased in flexible metal sheathing. Assume and loadings are placed immediately after stressing. Determine the stresses at the top and bottom of the beam, including the stress at the level of steel after three years. Given the following parameters: F'c = 5000 psi Fy = 240 ksi (Bonded, Stress-relieved) Fu = 270 ksi = Es 29,000 ksi Ec = 4,030 psi Fj = 235 ksi A = 1x0.6" 07-W.S. = 0.217 in² Yc = 140 lbs/ft³ ΔΑ = 3/8" RH = 33% Superimposed Service Load = 10 kips/ft (excluding self-weight)
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