Beam Deflection Experiment

2076 Words Feb 3rd, 2011 9 Pages
1.0 BACKGROUND OF STUDY
The deflections of a beam are an engineering concern as they can create an unstable structure if they are large. People don’t want to work in a building in which the floor beams deflect an excessive amount, even though it may be in no danger of failing. Consequently, limits are often placed upon the allowable deflections of a beam, as well as upon the stresses.
When loads are applied to a beam their originally straight axes become curved. Displacements from the initial axes are called bending or flexural deflections. The amount of flexural deflection in a beam is related to the beams area moment of inertia I, the single applied concentrated load P, length of the beam l, the modulus of elasticity E, and the position
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A load of 100g is placed at the end of the beam. 8. The result of the deflection from the dial gauge is checked and the measurement is collected in a table. 9. The methods above are repeated by adding 100g weight w until the total load reaches 500g. 10. For Test 2, using the same beam, the span of the beam of 450mm is adjusted from one end of the beam to the cantilever support. 11. The methods above are repeated by adding 100g weight w until the total load reaches 500g. 12. The effect of decreasing l is written and compared to Test 1 and Test 2.

3.3 EXPERIMENT 3 Simply Supported Beam Subjected to Uniform Bending Moment

Figure 3.3 Set-up for Experiment 3

Test | l (mm) | a (mm) | b (mm) | d(mm) | 1 | 250 | 125 | 21 | 6 | 2 | 250 | 135 | 21 | 6 |

Table 3.3 Beam Deflection Setting for Experiment 3

1. A rectangular beam with a length l of 600mm, base b of 21mm and height h of 6mm is prepared. 2. The beam is placed on the support beam and both ends of the beam distance a are 125mm. 3. A dial gauge is attached to the beam deflection apparatus which is placed in the middle of the beam and fastened to the apparatus. 4. The dial gauge support is allowed to slide freely on the beam. 5. The dial gauge is fixed to a point whereby the deflection is to be measured later. 6. A load of 100g is placed at each end of the beam. 7. The result of the deflection from the dial gauge is checked and the measurement is tabulated. 8. The
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