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Deflection Bridge Strain Tabs Proving Ring Dial Gauge Test Beam ° Spreader Beam Tie Rod Jack Test Bed

Deflection Bridge Strain Tabs Proving Ring Dial Gauge Test Beam ° Spreader Beam Tie Rod Jack Test Bed

Residential Construction Academy: House Wiring (MindTap Course List)
Residential Construction Academy: House Wiring (MindTap Course List)
4th Edition
ISBN:9781285852225
Author:Gregory W Fletcher
Publisher:Gregory W Fletcher
Chapter9: General Nec Requirements For Rough-in Wiring
Section: Chapter Questions
Problem 18RQ
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•Timber beam
Safe working stress = 25 MPa
Cross-section dimensions:
height = 119 mm,
width = 66 mm
Proving ring number 293.


Steel beam

 Safe working stress = 200 MPa
 Cross-section dimensions:
external height = 149 mm,
external width = 50 mm,
wall thickness = 3.0 mm,
Proving ring number 1522.

1)Calculate safe max bending moment in the central part of the beam using Mmax = (I)(max stress)/(D/2)
2) calculate Safe applied force in the proving ring or tie rod, assuming a symmetrical setup as in the photo
with a ‘lever arm’ of 600 mm

Deflection Bridge Strain Tabs Proving Ring Dial Gauge Test Beam ° Spreader Beam Tie Rod Jack Test Bed
Transcribed Image Text:Deflection Bridge Strain Tabs Proving Ring Dial Gauge Test Beam ° Spreader Beam Tie Rod Jack Test Bed
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