PROBLEM 6:A wooden log is to be used as a foot bridge to span a 2 m. gap. The log is to support to a concentrated load of 27 kN. Allowable Shear Stress = 1.2 MPa Allowable Bending Stress = 6.3 MPa 1.) What is the diameter of the log needed for a maximum shear? 2.) Find the diameter of the log needed so that the allowable bending stress is not exceeded. 3.) A 150 wide re ctangular log is to be used instead of the drcular log. What is the required minimum depth of the log so as not to exceed the allowable bending stre ss?
PROBLEM 6:A wooden log is to be used as a foot bridge to span a 2 m. gap. The log is to support to a concentrated load of 27 kN. Allowable Shear Stress = 1.2 MPa Allowable Bending Stress = 6.3 MPa 1.) What is the diameter of the log needed for a maximum shear? 2.) Find the diameter of the log needed so that the allowable bending stress is not exceeded. 3.) A 150 wide re ctangular log is to be used instead of the drcular log. What is the required minimum depth of the log so as not to exceed the allowable bending stre ss?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:PROBLEM 6:A wooden log is to be used as a foot bridge to span a 2 m. gap. The log is to support
to a concentrated load of 27 kN.
Allowable Shear Stress = 1.2 MPa
Allowable Bending Stress = 6.3 MPa
1.) What is the diameter of the log needed for a maximum shear?
2.) Find the diameter of the log needed so that the allowable bending stress is not exceeded.
3.) A 150 wide re ctangular log is to be used instead of the drcular log. What is the required
minimum depth of the log so as not to exceed the allowable bending stre ss?
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your answers are not in the choices.
1. A) 175 mm B) 150 mm C) 200 mm D) 250 mm
2. A) 820 mm B) 280 mm C) 230 mm D) 320 mm
3. A) 500 mm B) 300 mm C) 400 mm D) 600 mm
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