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Wooden Beam Tests
CE 206
(C.E. Lab #6)
Conducted: April 1
st
, 2010
Submitted to: Prof. Brown, April 8
th
, 2010
Tom Wienckowski
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Page
Abstract
3
Introduction
4
Methods and Procedures
5
Results and Discussion
6
Conclusions
11
References
11
Appendix
12
2
Abstract
Bending tests on various wooden beam specimens provide engineers with the data
for what type of wood and size of beam should be used in specific structures and
construction.
The objective of this lab was to determine the appropriate mechanical
properties and typical factors of safety of wooden beams.
Three beams were tested on
end, and two beams were tested flat using the TiniusOlsen testing machine.
The results
showed that the 2 x 4 Douglas fir beam could hold the largest load while tested on end.
The 2 x 6 Hemfir beam held the largest load while tested flat.
The results were used to
draw shear and bending moment diagrams, to calculate the modulus of rupture for the
wood, the maximum shear stress, what safety factors were allowed for shear and bending
and the theoretical deflection at 25%, 50%, and 100% of ultimate load.
The results found
were used to compare the theoretical deflections to the actual deflections from the load
versus deflection plot.
This comparison showed that all of the beams deflected more
during testing than the theoretical calculations.
3
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Wood is a material that is frequently used in engineering for construction of
various types of structures.
Different types of wood are used depending on the different
types of conditions and stresses applied to the wood.
The shear and bending properties
are factors that an engineer should consider when choosing a certain wood for a project.
The objective of this lab was to determine the appropriate mechanical properties and
typical factors of safety of wooden beams.
We tested two 2 x 4 HemlockFir wooden
beams, two 2 x 6 HemlockFir wooden beams, and one 2 x 4 Douglas Fir beam.
Each
type of beam was tested once onend, and the 2 x 4 hemlockfir beam and the 2 x 6
hemlockfir beam were tested flat to determine the amount of load each beam could resist
in the specific orientation.
The data found was used to draw shear and bending moment
diagrams, to calculate the modulus of rupture for the wood, the maximum shear stress,
what safety factors were allowed for shear and bending and the theoretical deflection at
25%, 50%, and 100% of ultimate load.
The results found were used to compare the
theoretical deflections to the actual deflections from the load versus deflection plot.
4
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This note was uploaded on 06/08/2010 for the course CE 342 taught by Professor Brown during the Spring '10 term at Widener.
 Spring '10
 BROWN

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