A floor joist consists of a 2" x 10" No. 2 Southern Pine(Fa = 800 psi). The joists are spaced at 24" on center.The beam is subjected to a dead load of 20 lb/ftincluding beam weight and a live load of 60 lb/ft. If thelength of the beam is 14 ft, determine the actual stressdue to the loads on the beam, and if the section isadequate for the loads being carried.

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Answered: A floor joist consists of a 2" x 10"…

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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Wood planks are used on each working level. The deck width/bearer span is 5 ft.. The bearers and posts are standard pipe and the pipe material is A36 steel with a yield stress of 36,000 psi and modulus of elasticity of 29,000,000 psi. Bearers are to be located at a vertical spacing of 10 ft (largest, lowest post height). Posts are to be 7 ft oc (plank length) parallel to the building wall and 5 ft apart (bearer length) perpendicular to the building wall. There are four working levels and the anticipated scaffold loading will be med duty. A. Assuming the ultimate bending strength of the planks is 3,800 psi (apply a 4:1 F.O.S.), determine the required minimum plank thickness to the nearest 100th. B. Based on the bearer material provided, what is the minimum pipe size that can be safely used? See Appendix 2 in your textbook for steel pipe properties. C. Based on the post material provided, can a 2” standard pipe be used safely? Be sure it satisfies buckling stress conditions only.
A 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 04
A short column is made by nailing four 1 x4-in. planks to a 4 x 4-in. timber. Using an allowable stress of 600 psi, determine the largest compressive load P that can be applied at the center of the top sec-tion of the timber column as shown if (a) the column is as described, (b) plank 1 is removed, (c) planks 1 and 2 are removed, (d) planks 1, 2, and 3 are removed, (e) all planks are removed.
A 4-m simply supported timber beam is to be designed to carry a total uniform load of 10 kN/m including its own weight. The timber is 80% stress grade Apitong. The nominal size of the beam is 200 mm x 260 mm. Before installation, the width and depth are to be reduced by 10 mm. 7a Find the maximumshearing stress. a. 0.50 MPa C. 0.86 MPa 7b. Find the maximum bending stress. a. 12.50 MPa c. 11.20 MPa 7c. Find the maximum deflection. a. 18.43 mm C. 14.50 mm b. 0.63 MPa d. 1.20 MPa b. 8.50 MPa d. 10.11 MPa b. 25.63 mm d. 12.60 mm
Topic: Restrained Beams 140KN 2.5m 3.5m 5KN/m 3.2m МА 6m MB 11WL2 Pab² 5WL2 Pa?b MA = - MB = - 192 L2 192 L2 INSTRUCTION: 1. Determine the maximum stress in the timber beam with the size of 120 x 370mm.
A 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.
Problem 6.3 A short column is made by nailing four 1 x 4-in. planks to a 4x4-in. timber. Using an allowable stress of 600 psi, determine the largest compressive load P that can be applied at the center of the top section of the timber column if (a) the column is as shown in the figure, (b) planks 1 and 2 are removed, and (c) planks 1, 2, and 3 are removed.
A timber beam 150 mm wide and 200 mm deep is to be reinforced by bolting on two flitched each 150 mm x 12.5 mm in section. Find the moment of resistance when the flitched are attached symmetrically at the top and bottom. Allowable stress in timber is 6 N/mm². (Es= 20 Ew)
For the beam and loading shown, design the cross section of the beam, knowing that the grade of timber used has an allowable normal stress of 12 MPa.
The square timber used as a railroad tie carries two uniformly distributed loads, each totaling 48 kN. The reaction from the ground is uniformly distributed. Determine the smallest allowable dimension b of the section if the bending stress in timber is limited to 8 MPa.
Design economical spacing of 10 mm diameter stirrups for the beam which carries the loads shown. Design shear reinforcement of prestressed beam with the following properties listed. Properties: f’c = 28 MPa fy = 276 MPa Aps = 800 mm2 Ds = 10 mm Dm = 18 mm fse = 800 MPa fpu = 1500 MPa fpe = 860 MPa Pe = 250 kN
The wood beam has a square cross section. Find the smallest allowable cross-sectional dimensions if the working stresses are 8 MPa in bending and 1.0 MPa in shear. 5 kN 2 kN • m D B F10m- 1.0 m 1.0 m -1.0 m

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