Lab #6 - Wooden Beams

Lab #6 - Wooden Beams - Wooden Beam Tests CE 206 (C.E. Lab...

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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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Table of Contents Page Abstract 3 Introduction 4 Methods and Procedures 5 Results and Discussion 6 Conclusions 11 References 11 Appendix 12 2
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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 Tinius-Olsen 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 Hem-fir 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 Hemlock-Fir wooden beams, two 2 x 6 Hemlock-Fir wooden beams, and one 2 x 4 Douglas Fir beam. Each type of beam was tested once on-end, and the 2 x 4 hemlock-fir beam and the 2 x 6 hemlock-fir 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.

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Lab #6 - Wooden Beams - Wooden Beam Tests CE 206 (C.E. Lab...

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