LECTURER NAME : PN. ROSLINA BINTI BINTI ABD. TALIB. MARKS
:
INTRODUCTION: The main purpose of any structure is to support the loads coming on it by properly transferring them to the foundation. Even animals and trees could be treated as structures. Indeed biomechanics is a branch of mechanics, which concerns with the working of skeleton and muscular structures. In the early periods houses were constructed along the riverbanks using the locally available material. They were designed to withstand rain and moderate wind. Today structures are designed to withstand earthquakes, tsunamis, cyclones and blast loadings. Aircraft structures are designed for more complex aerodynamic loadings. These have been made possible with the advances in structural engineering and a revolution in electronic computation in the past 50 years. The construction material industry has also undergone a revolution in the last four decades resulting in new materials having more strength and stiffness than the traditional construction material
OBJECTIVE. The objective of the experiment is to measure the value of prop reaction for a propped cantilever and to compare it with the result obtained theoretically.
THEORY: Consider the propped cantilever beam shown below:
The deflection of point A and B (which is horizontal) is equal to the moment of area of the bending moment diagram about B divided by EI.
APPARATUS: BUILT 2
IN SUPPORT
STIRRUPS
DOUBLE
ENDED HOOK
LOAD HANGER WEIGTHS TEST
BEAM
SPRING BALANCE WITH ADJUSTER DIAL GAUGE SUPPORT
DIAGRAM:
PROCEDURE:
1) Set up the apparatus with L=800mm as shown above. 2) Make sure the beam is horizontal. Zero the dial gauge by using the dial gauge bezel and note the initial reading of the spring balance. 3) Apply the load of 5N then adjust the spring balance adjuster until the dial gauge reads zero, then note the spring balance reading. 4) Increase the load by 5N increments and repeat the experiment up to maximum loading of 40N. 5) Tabulate the data and plot the graph of load (w) against R actual. Determine the slope of the graph.
RESULTS:
Load
5
10
15
20
25
30
35
40
Initial reading (Ro)
4.3
4.3
4.3
4.3
4.3
4.3
4.3
4.3
Final reading (Rf)
5.3
7.3
9.3
11.3 13.3 15.3
17.3
19.3
1.0
3.0
5.0
7.0
13.0
15.0
Actual Reading (Ractual=Rf - R0)
9.0
11.0
QUESTION:
How well does the results of the experiment compared of the result obtained theoretically?
WORKING PICTURE
CONCLUSIONS
DISCUSSION What I find when conducting this experiment, the results of experiments that I found different when performed three times and I only take the average answer. This may be due to age of existing equipment as highlighted in the laboratory were over the age of time and can give a small error in giving answers or measure. factor of human error in the answer also taken into account during the experiment is run. in addition, environmental factors in the laboratory also uncertain and may influence the answers. the outcome of the discussion group I found that every experiment will get different answers from the results of other groups.
REFERENCES.
http://wiki.answers.com/Q/What_is_a_propped_cantilever_be am
