Lab report of reaction on beam

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Lab report of reaction on beam

Hamza Momade Table of Contents 1. Beams are of different types, the most common types of beams are: A continuous beam is a statically indeterminate structure. They are used to increase structures strength and provide alternate load paths in cases of failure. A continuous beam has advantages over a simple beam in terms of lesser mid span deflection which is less and a higher vertical load capacity.

A pinned support is a type of support that can resist both horizontal and vertical forces. The experiment was carried out on by group 6 members in the structures laboratory. For task 1, the analysis of the continuous beam will be carried out using the elastic theory.

Since in a continuous beam there both positive and negative moments, and in other parts of the beam both negative and positive moments are present.

The stiffness method is used and the moment distribution method to find the reaction at the supports. For task 2, the beam is a fixed end beam, and moments will be generated at the fixed end when a load is applied. The moment distribution method is used in this case. Since in this experiment we are dealing with a point load there are two general two formulae for two conditions: The first scenario occurs when the point load applies at mid span of the beam.

The formula used is: The second scenario occurs when the point load is applied at a distance a, from the support. Here the formula changes to: The aim of the experiment is to determine the reactions at a two-span continuous beam. The apparatus used included: The switch on the digital gauge was turned on 10minutes before the experiment stable for a stable reading to be obtained.

The reaction piers were clamped to support frame using the plate and bolt at a calculated distance.

Lab report of reaction on beam

We then connected the load cell from the supports to the digital gauge. The beam specimen was thereafter placed between the two cylindrical pieces of each support and tightened in place by using screws for the fixed ends.

The positions of the hangers ac and bc were been calculated and the load hangers were placed at the calculated distances from the supports. On the right hand span, a constant load of 10N is applied.

Lab report of reaction on beam

We kept increasing the load by 5N until a total load of 25N was loaded on the hanger. The load cell readings for all the loads were recorded down.

Experimental setup for continuous beam. The following is the experimental values after subtraction from the previous values has been done Example: For the 0 N load: Section AB of beam: Section BC of beam: The following are the graphs comparing the experimental and theoretical reactions with the loads applied.

It can be noted that when the load increases, so does the support reaction. Overall, the theoretical results are proven to be greater than the experimental. Well the graph shows two different colours of lines. The green line stands for experimental results while the red colour line stands for the theoretical results.

At the rest of the points, the experimental line is close to the theoretical line which means the experiment was conducted successfully with the minimum error possible.

RB Theoretical vs RB Experiment Well, it can be noted from the figure that the support at the middle has the highest moment among all the three supports.

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This is because some of the moment from the right and left support is shared by the middle support. As it can be seen from the figure above, the line keeps increasing as more load is placed.

Figure 3 shows two lines which were parallel to each other and sometimes overlapping. The two lines were increasing from 0N till 10N.

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As the load increases the two space between the two lines was increasing and that is due to errors.LiveScience is where the curious come to find answers.

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