5.2A one-story exterior platform is shown in the following figure. The roof is one-way slab. Answer the following questions(a through i) and design a one-foot wide strip of the roof slab.One-Story Concrete Platform20-0SlabBeam25-0b) Determine the minimum slab depth based on ACI Table 9.5(a) 5.1.a) Determine the span length for the slab(assume that the support beams and columnsat each end of the slab are 12 inches wide).c) Assume that this slab is 14-inch-thick and it must support 25 psf weight of non-structural equipment and 50 psfcode-required live load. Calculate the slab average design loads (in psf).d) Calculate the factored design load: U = 1.2DL+ 1.6LL

a. 24 ft, 19 ftb. 4 inchesc. 250 psfd. 320 psfExplanation:

Answered: 5.2 A one-story exterior platform is…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The effective spans for a simple one-way slab system, with an overhang are indicated in the figure below. The specified ultimate design loads on the slab are 6.0 kN/m2 and 4.5 kN/m2 for dead loads and live loads respectively. Considering the possibility of live loads not occuring simultaneously on both span, determine the maximum spacing (in mm units) of 8 mm diameter bars required as bottom reinforcement in the span AB, assuming an effective depth of 125 mm. Assume M 20 concrete and Fe 415 steel. A В C 3.5 m - 41.5 m
Determine the tensile steel strain (in 5 decimal places) compatible with concrete strain of 0.003 for a singly reinforced beam 300 mm wide, 680 mm deep reinforced at the bottom with 6-ϕ20 mm bars with effective depth 590 mm. Use f’c = 21 MPa and fy = 420 MPa.
Q2: Find the minimum thickness of a slab for an interior panel due to deflection control for the following: Use f, = 420MPA. a- Slab with beams (8.2 x 7.8) m clear span with am= 2.2 b- Slab without drop panels (5.4 x 5.0) m clear span with am= 0.11 c- Flat plate (4.4 x 4.6) m clear span. d- Flat slab with drop panels (6.2 x 6.2) m clear span. e- Slab with beams (5.2 x 5.8) m clear span with am= 1.7% %3D 2.
Design a one-way slab having a simple span of 3.5m. The slab is to carry a uniform live load of 4.8 kpa and uniform dead load of 6.68kN/m. Assume f'c=27.6 Mpa, fy=276 Mpa for main and temperature bars. The slab is not exposed to earth or weather. Use unit weight of concrete Yc=23.5 kN/m^3
A Spiral column is to be loaded with DL=500Kn and LL=500Kn with minimal reinforcement. The Design spiral confinement spacing is 70mm when the spiral ratio is 0.015. If the Concrete f'c = 28Mpa and Steel fy = 420Mpa, Concrete cover is 40mm and diameter of stirrups is 10mm. the Column is to be reinforced with 25mm bars. Determine the Diameter of the spiral column. use exact value. Answer in mm in 3 decimal places.
Determine the anchorage set loss (draw in = 4mm) of a post-tensioned prestressed concrete (simply supported L=15m, H="1000"mm, B="500"mm) given that, fpi="2000"MPa, f'ci="40"MPa, Eps="200"GPa, and the total area of the straight profile tendons is "140" sq mm located "250"mm from the centroid of the section and was tensioned on both ends. Assume k="0.0012" and ?="0.2" Provide the answer in percentage.
The floor beam shown is used to support the 6-ft width of a lightweight plain concrete slab having a thickness of 4 in. The slab serves as a portion of the ceiling for the floor below, and therefore its bottom is coated with plaster. Furthermore, an 8-ft-high, 12-in.-thick lightweight solid concrete block wall is directly over the top flange of the beam. Determine the loading on the beam measured per foot of length of the beam. Assume that the density of concrete slab is 100 lbs/ft3, design load for plaster ceiling is 5 psf and density for block wall is 105 lbs/ft3.
J
Determine the tensile steel strain (in 5 decimal places) compatible with concrete strain of 0.003 for a singly reinforced beam 300 mm wide, 680 mm deep reinforced at the bottom with 6-ϕ25 mm bars with effective depth 590 mm. Use f’c = 21 MPa and fy = 420 MPa.
A rectangular concrete beam 300 mm wide is subjected to a sagging moment of 20 kN-m and a torsional moment of 30 kN-m. Design a suitable depth for the beam and the required. longitudinal reinforcement Allowable stresses are: Ocb = 5 N/mm; O = 140 N/mm and m = 19 The following criteria given in the code may be used for design: Equivalent bending moment Mel = M+MT Where M bending moment at the cross- 1+D/b section and M, = T 1.7 %3D Where T= Torsional moment, D= overall depth of beam and b = breadth of beam. If M, given by the above equation exceeds the numerical value of the moment M, longitudinal reinforcement shall be provided on the flexural compression face such that the beam can also withstand an equivalent moment Me2 =MT-M Being taken as acting in the opposite sense to the moment M.
Q2: Find the minimum thickness of a slab for an interior panel due to deflection control for the following: Use fy = 420MP.. a- Flat slab with drop panels (6.2 × 5.5) m clear span b- Flat plate (3.8 × 3.2) m clear span. c- Slab with beams (7.8 × 7.8) m clear span with am= 3.4 d- Slab without drop panels (5.9 × 5.3) m clear span with am= 0.11 e- Slab with beams (6.1 x 5.2) m clear span with am= 1.4
For the slab shown in the figure, Fy= 420 Mpa, Col. Dimensions = 400 x 400 mm, check slab thickness at exterior panel for deflection control for the following cases: 1- Flat slab without edge beam and without drop panel 2- Use edge beam only. 3- Use Drop Panel only. 4- Use edge beam and drop panel. 5- Use beams for all lines with am = 0.5. 6- Use beams for all lines with am = 1.5. 7- Use beams for all lines with am = 2.5. Discuss the results. 7.2 m 7.2 m 7.2m 7.2 m 7.2 m 7.2 m

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