By:ALIF HANIFA BIN CHE HASSAN (GL)

ADIBAH BINTI HANUSIAHMAD ZUHAILI BIN ZAINAL BASRI

ALBOGAMY, KHALED NAWAR MARIF AZRAEI BIN SAHABUDIN

CRISTINE HURING ANAK PATRICK KENNEDYDANIA QISYTEENA BINTI SALAHUDDIN

HAFIZAH HANUN BINTI ABU BAKAR

MEMB123 MECHANICS STATICS SLIDES PRESENTATION

Bridge Design Project

CRITERIAIn this project, we designed, built, and tested a model bridge with the measurements as

stated below:

69cm

49.2cm

Actual measurements for our design

PROTOTYPE DESIGN AND TESTING

DIMENSIONS

We’ve been told that the bridge should not be longer than 70cm. The width of the bridge should be at least 5cm but not more than 10cm. The height of the bridge should not be exceeds 20cm above or 5 cm below “ground level”. The bridge also must span a distance of 50 cm. So, we had to think of how we’re going to use the sticks and getting some useful information about them.•1 stick = 150mm•After calculating, we knew that we will need about 187 sticks for the base while total length of the bridge= 69cm

ANALYSIS/ SYNTHESIS/ CONCEPTUALIZATION

We were making 2 tests to perform the bridge component strength.

Test 1 - Tension Test Objective The objective of the tension test is to determine a recommended overlap distance for two tongue depressors in tension (taking into account strength and total span length). Procedure 1. The test specimens were built by gluing two tongue depressors together using different lengths of overlap ( max. < 3/4"). We made sure to test at least 3 specimens for a given overlap distance to ensure more accurate results. The hole was reinforced with extra pieces of tongue depressor. 2. The sticks were placed in the vice on the testing platform and the hole was reinforced at the other end with tape.

Test 2 - Compression Test Objective The objective for Test 2 is to determine a maximum length that designers should not exceed, to ensure adequate strength from compressions members. Procedure 1. A ruler is used to prepare several specimens for the compression test ranging in length from 3” to about 10”. For members greater than 6”, two tongue depressors were glued together with a 1” overlap length and then the ends was cutting to the desired length. At least 2 samples for each length are prepared to ensure some level of accuracy. 2. To test the specimens, we were placed them upright on the scale and pushed down as shown in Figure 2 (using pliers may be easier on our hands).

ALTERNATIVE DESIGNS CONCEPTUALIZATION

BRAINSTORMING IDEAS

To make the start of the project easier, some questions were asked!!

MATERIALS

•Tongue depressor sticks•A metal hook to carry the load at the center of the structure•Glue gun and glue sticks•String/ masking tape

CONSTRUCTION METHOD

1. Firstly, we decided on the design and laid it out on paper.2. Then, the sticks were measured and marked so they could be drilled for

the pin joints. 3. Next, we constructed the floor for the length of the bridge, or the struts

we will apply the sides to.4. After that, we measured the length of the floor or struts. It is likely the

bridge has to span a specified length.5. Finally, we attached each poles with ropes to the struts.6. Then, we constructed a number of identical poles by tied them with tiny

rope we are going to join to the struts or floor.

TESTING PROCEDURE

The bridge has been tested to failure using the testing apparatus in the picture since it must hold a minimum weight of 5 kg or 50 N.

Efficiency ratio = test load/weight of model = 5 KG / 7.65 KG= 6.536

DESIGN OF THE BRIDGE

CONCLUSION

At the end, we have accomplished the required task. We had a lot of fun, challenge, tire , and memorable experience that we have gained. The bridge task teaches us the values of determination, perseverance, creativity, logic thinking, time management, cost effectiveness, initiatives, and all this values can lead us towards success when we are working in group. Although we were facing a lot of difficulties in decision making and getting ideas but our cooperated team members were very patient and managed to solve the problems that we had during the construction. We started our project early so that we have time to modify and troubleshoot the problems. Flexibility, creativity and perseverance are our motto.

ATTACHMENTS

THANK YOU