Structural Steel Design (6th Edition)
6th Edition
ISBN: 9780134589657
Author: Jack C. McCormac, Stephen F. Csernak
Publisher: PEARSON
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Chapter 2, Problem 2.5PFS
Structural steel beams are to be placed at 6 ft on center under a reinforced concrete floor slab. If they are to support a service dead load
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A simply supported timber beam with length L - 5m carries a uniformly distributed load w - 8 kN/m. Determine the magnitude of the
maximum compression bending stress that occurs in the beam at any location within the 5-m span length.
300 mm
100 mm
O 16.67 MPa
O 21.39 MPa
O 19.63 MPa
O 10.08 MPa
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The dimensions for a reinforced concrete beam are given as: b = 300mm d = 400mm d’ = 75mm It is to be designed for a service dead load moment of 30kN-m and a service live load moment of 40kN-m. Suppose f’c = 21MPa and fy = 276MPa, how many 20-mm bars are required to reinforced the beam in terms of steel area?
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- The rectangular reinforced concrete column shown is part of a special moment frame in a region of high seismic risk. The columns above and below the joint have the same cross section containing properly developed and confined concrete whose interaction diagram is shown below. Under factored gravity and seismic loads, the design axial compression forces on the columns are: • Case 1: Pua = 260 kip, Pub = 320 kip • Case 2: Pua = 55 kip, Pub = 100 kip Find the maximum nominal moment strength of the beam permitted by ACI to alleviate plastic hinges forming first in the columns for the loading cases?arrow_forwardthe given section of beam is at point of maximum moment of the beam loaded shown. use n=8 , calculate the compressive force of the concretearrow_forwardProblem 1 The members of the truss shown below are of plain concrete. The compressive cylinder strength of concrete is 30 MPa. Determine whether the structure can carry the applied load. 31 KN 24 KN D 120x120mm 40x40mm 40x40mm 120x120mm 300 mm 40x40mm 400 mmarrow_forward
- 15 A floor slab 100 mm thick is cast monolithically with beams 250 mm wide 450 mm deep spaced 1.2 m on centers, on simple supports over a span of 5.0 m. The floor supports a service live load of 2.1 kPa. Using fe = 21 MPa, rebar strength fy = 415 MPa, calculate the following if a typical interior beam is reinforced with 3- 16-mm-dia. flexure bars at the bottom enclosed with 10-mm-dia. stirrups: Nominal moment capacity (kN-m) of a typical interior beam in positive bending considering T-beam geometry. A. 96.66 1. В. 86.99 C. 91.10 D. 81.99 2. Maximum factored uniformly distributed load (kN/m) a typical interior beam can sustain against positive bending. A. 30.93 В. 27.83 C. 26.23 D. 29.15 Maximum service superimposed dead load in kPa. A. 17.73 3. В. 11.08 С. 16.52 D. 14.77arrow_forwardA timber beam in an existing building is 200 mm wide and 380 mm deep and is simply supported at the ends of 4 6 m span. A) Calculate the safe uniformly distributed load for the timber alone if the bending stress must not exceed 7 N/mm2. B) It is proposed to strengthen the beam to enable it to carry a uniformly distributed load of 150 kN by bolting two steel plates to the beam as shown below. Calculate the required thickness t of the plates if the plates if the maximum permissible stress for the steel is 140 N/mm2 and the modular ration is 24arrow_forwardI want the solution for the questionarrow_forward
- A 300mm x 425 rectangular beam is reinforced for tension only with 4-28mm bars. The beam has a concrete cover of 40mm and a stirrup of 10mm diameter bar. The beam carries a live load and a dead load (without its self-weight). Given that unit weight of concrete is 24kN/ cu.m f'c = 21 MPa and fy = 414 MPa, calculate the additional concentrated live load as shown in the figure.arrow_forwardA decorative concrete beam shown is simply supported on a span of 5m. f'c = 21 MPa Unit weight of concrete = 23.5 KN/m³ fr = 3 MPa RSB = 3-28mmo fy = 414 MPa concrete cover = 70mm In addition to its weight, what is the safe maximum uniform live load the beam could support. 100 mm 600 mm As 300 mmarrow_forwardA cantilever timber beam with a span of L-3.7 m supports a uniformly distributed load w. The beam width is b- 320 mm and the beam height is h- 270 mm. The allowable bending stress of the wood is 5.7 MPa. Determine the magnitude of the maximum load w that may be carried by the beam. Answer: w- kN/m. Save for Later Attempts: 0 of 1 used Submit Answerarrow_forward
- X = 212 B = 1arrow_forwardA TIMBER BLOCK "B x B" mm SQUARE IS REINFORCED ON OPPOSITE SIDES BY A "B" mm AND 't' mm THICK STEEL PLATES. DETERMINE THE THICKNESS 't' SO THAT THE ASSEMBLY WILL SUPPORT AN AXIAL LOAD OF 1000 KN WITHOUT EXCEEDING A MAXIMUM TIMBER STRESS OF 12 MPa OR A MAXIMUM STRESS IN STEEL OF 350 MPa. MODULUS OF ELASTICITY OF STEEL AND TIMBER ARE 210 GPa & 7 GPa RESPECTIVELY. B t B t PROB 04arrow_forwardi need the answer quicklyarrow_forward
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