
Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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A fully grouted reinforced masonry wall is to be constructed of 8-in. CMU. The wall height is 18
feet. It is assumed to be simply supported. The wall is to be designed for an out-of-plane seismic
load of 52 lbs./ft.2, which can act in either direction. The wall also supports a roof dead load of
600 lbs./ft. and a roof live load of 300 lbs./ft. along the wall length. The roof loads have an
eccentricity of 2.5 inches. Since there is seismic load, load combinations (6) and (7) in Chapter 2
of ASCE 7-22 should be considered. In these two load combinations,horizontal seismic loadhE =
andvertical seismic loadvE = . You may ignorevE in this problem for simplicity. The masonry
has a specified compressive strength of 2,500 psi.
feet. It is assumed to be simply supported. The wall is to be designed for an out-of-plane seismic
load of 52 lbs./ft.2, which can act in either direction. The wall also supports a roof dead load of
600 lbs./ft. and a roof live load of 300 lbs./ft. along the wall length. The roof loads have an
eccentricity of 2.5 inches. Since there is seismic load, load combinations (6) and (7) in Chapter 2
of ASCE 7-22 should be considered. In these two load combinations,horizontal seismic loadhE =
andvertical seismic loadvE = . You may ignorevE in this problem for simplicity. The masonry
has a specified compressive strength of 2,500 psi.
(a) Use the strength design provisions of TMS
402 to determine the size and spacing of the vertical bars needed. Use the P-δ analysis method in
Section 9.3.4.4.2 of TMS 402 to determine Mu.
402 to determine the size and spacing of the vertical bars needed. Use the P-δ analysis method in
Section 9.3.4.4.2 of TMS 402 to determine Mu.
(b) Repeat the design using the moment
magnification method in Section 9.3.4.4.3 instead.
magnification method in Section 9.3.4.4.3 instead.
Please calculate critical section at span as D and please calculate the Load Combinations and also Design Load Combination , please fins Mcr (moment craking) compare with Mu by using Load Combination 5.
PLEASE FELLOW THE QUESTION INSTRUCTION for complete design. THANKS!
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- a) A 14-ft. tall and12-ft.-8-in. long fully grouted reinforced masonry wall is constructed of 8-in.CMU. It is to be analyzed for out-of-plane loading. Construct thenP -nM curves for the wallwith the following three vertical reinforcement scenarios: (1) 10 No. 6 bars at 16 in. spacing,(2) 10 No. 5 bars at 16 in. spacing, and (3) 7 No. 4 bars at 24 in. spacing. The steel is Grade60 with a modulus of elasticity of 29,000 ksi, and the masonry has a compressive strength of2,000 psi. You may use Excel or Matlab to construct the curves. Also, show the maximumnPallowed by the code for each case.(b) For each of the above reinforcement scenarios, determine the maximum axial loads that arepermitted for the tension-controlled condition and transition condition.(c) Discuss how the amount of vertical reinforcement affects thenPn - Mn curve.arrow_forwardDesign the reinforced masonry beam in the wall shown below. The wall is to be constructed of fully grouted hollow concrete masonry units in running bond. It is to carry its own weight plus a superimposed dead load of 2.5 kips/ft and a live load of 0.8 kip/ft. Determine the width of the masonry units (by trials), and the amounts of the longitudinal and shear reinforcement required using the strength design method of TMS 402-22. Show the layout of the reinforcements with diagrams. Use fm = 2,000 psi, Grade 60(60 ksi) steel, and Type S Portland cement mortar. Assume that the centroid of the bottom rebar is 3 inches from the bottom face of the beam. ( you may assume that the unit weight of fully grouted concrete masonry is 125 lbs per cubic foot.)arrow_forwardA simple supported one-way slab spans 24 ft. In addition to its own weight, it supports an uniformly distributed service live load of 100 psf. A masonry wall, which has a service dead load of 1500 lb/ft, is also supported by the slab along with an uniform service floor live load (a line load) of 500 lb/ft loaded as shown below in the figure. (a) (b) Select the depth of the slab using ACI Code's minimum thickness requirements where deflections are not computed. Design the primary steel and temperature steel and show your results in a sketch. The concrete is light-weight concrete and has a unit weight of 110 lb/ft³. Assume 3/4 inch cover on the reinforcement aand that f' 3 ksi and f₁ = 60 ksi. Use #6 bars for the primary steel and #4 bars for the shrinkage and temperature steel. Assume interior exposure, and use ACI 318-19. Repeat part (a) NOT using the ACI Code's minimum thickness requirements for cases where deflections are not computed. Use #6 bars for the primary steel and #4 bars…arrow_forward
- For the data given in this problem, determine the magnitude of the active thrust on the wall retaining a c soil, using the procedure discussed in Section 16.10. Given H = 15.0 ft, c = 100 lb/ft2, = 26, = 115 lb/ft3, kv = 0, and kh = 0.3.arrow_forwardA W1422 acts compositely with a 4-inch-thick floor slab whose effective width b is 90 inches. The beams are spaced at 7 feet 6 inches, and the span length is 30 feet. The superimposed loads are as follows: construction load = 20 psf, partition load = 10 psf, weight of ceiling and light fixtures = 5 psf, and live load = 60 psf, A992 steel is used, and fc=4 ksi. Determine whether the flexural strength is adequate. a. Use LRFD. b. Use ASD.arrow_forward
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