2019-04-25T09:53:32+00:00 sample questions

Calculate the bending moments at the central zone of the beam (where strain gauges are located) for each loadings and enter into Table 2. (5%)

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Part (a) – Strain vs bending moment

 

1.       Calculate the bending moments at the central zone of the beam (where strain gauges are located) for each loadings and enter into Table 2. (5%)

 

2.       Correct the strain reading values to zero (Take note of the signs) and enter into Table 2. (5%)

 

3.       From your results, plot a graph of bending moments (y-axis) against strain (x-axis) for all 9 gauges on the same graph. (5%)

 

4.       What is the relationship between the bending moment and the strain at various positions? (5%)

 

5.       What do you notice about the strain gauges readings on opposite sides of the section? Are they identical? Discuss. (10%)

 

 

 

Part (b) – Neutral axis

 

1.       Carefully measure the actual vertical position of the strain gauges and enter into Table 3 (consider bottom of the beam as datum).

 

2.       Calculate the average strains readings (corrected) from each pairs of gauges (on opposite sides) and fill up Table 3. (5%)

 

3.       Plot the strain against the relative vertical position on a same graph for each value of bending moment. (5%)

 

4.       Calculate the theoretical values of centroid and second moment of area (about the centroid) of the beam section. (You may use a Vernier to measure the exact size of the section) (10%)

 

5.       Plot the location of centroid on the strain vs position graph (use the same graph from no. 3). (5%)

 

6.       What is the value of strain at the centroid? (5%)

 

7.       What does this imply? (10%)


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