It is important for a structure to be stable within the scope of load-bearing systems. For this reason, the loads that the elements necessary to balance the forces and hold the structure together and the loads they can withstand are important. In this context, beams and loading elements should be calculated in detail with mathematical methods. With the calculations made within the scope of the target weight, the bridge should be built. How the tension and compression elements should work for truss systems should be discussed. Based on a design idea determined in the bridge construction, the bridge was built with static calculations to be tested, based on the bridge weight given.
METHODOLOGY
With a good understanding of the compression and tension elements, the necessary calculations were made to construct a spaghetti bridge. The weight of the total bridge, defined within the scope of the rules, must be a maximum of 250 g. On the other hand, the span of the bridge should be 650mm. From the support areas of the bridge, a 7.5 cm wide projection should be left on both sides. The protrusions have been designed as this part must remain on the table. Thus, the distance between the tables is 50 cm, the sides are 15 cm in total, so the length of the bridge is 65 cm.
The loading plate to be used in the tests will be 5cm wide, 1cm thick and 20cm long. The bridge will be constructed based on the wooden plate that will be centered from the subfloor of the bridge. To avoid buckling, the cross-sectional area of the compression bars has been increased in some places, and the size of the compression bars has been shortened in some places.
The bridge is designed to accommodate the total weight of spaghetti. For this, firstly, the weight of one spaghetti was calculated. Accordingly, the dimensions of the pressure bars were prepared. 1 half pack of filiz spaghetti is 247 grams. When the calculation of 247 grams of spaghetti containing 125 pieces of spaghetti was made, it was found that one piece of spaghetti was 2 grams.
DESIGN IDEAS
With a good understanding of the compression and tension elements, the necessary calculations were made to construct a spaghetti bridge. The weight of the total bridge, defined within the scope of the rules, must be a maximum of 250 g. On the other hand, the span of the bridge should be 650mm. From the support areas of the bridge, a 7.5 cm wide projection should be left on both sides. The protrusions have been designed as this part must remain on the table. Thus, the distance between the tables is 50 cm, the sides are 15 cm in total, so the length of the bridge is 65 cm.
The loading plate to be used in the tests will be 5cm wide, 1cm thick and 20cm long. The bridge will be constructed based on the wooden plate that will be centered from the subfloor of the bridge. To avoid buckling, the cross-sectional area of the compression bars has been increased in some places, and the size of the compression bars has been shortened in some places.
The bridge is designed to accommodate the total weight of spaghetti. For this, firstly, the weight of one spaghetti was calculated. Accordingly, the dimensions of the pressure bars were prepared. 1 half pack of filiz spaghetti is 247 grams. When the calculation of 247 grams of spaghetti containing 125 pieces of spaghetti was made, it was found that one piece of spaghetti was 2 grams.
ELEVATION OF SPAGHETTI BRIDGE
BOTTOM VIEW OF SPAGHETTI BRIDGE
TOP VIEW OF SPAGHETTI BRIDGE
For the bridge, which is expected to be built with a total weight of 247 grams, the design process has been started by using 3 different lengths. In this process, weight calculation was made according to spaghetti dimensions. Spaghetti lengths used in our design are 25cm, 14cm and 10cm.
Spaghetti prepared in 25 cm length consists of 10 pieces, each of which contains 7 pieces of spaghetti. In other words, a total of 70 spaghetti with a length of 25 cm were used. Spaghetti prepared in 14 cm length were formed in three different ways. It consists of 8 pieces, each containing 5 pieces of spaghetti. The other consists of 2 pieces, each containing 3 pieces of spaghetti. Finally, it consists of 6 pieces, each containing 2 pieces of spaghetti. In other words, a total of 58 spaghetti with a length of 14 cm were used. Spaghetti prepared in 10 cm length were formed in three different ways. It consists of 2 pieces, each containing 7 pieces of spaghetti. The other consists of 2 pieces, each containing 5 pieces of spaghetti. Finally, it consists of 10 pieces, each containing 2 pieces of spaghetti. In other words, a total of 44 pieces of spaghetti with a length of 10 cm were used. The total spaghetti weight used in the designed bridge was calculated as 240 gr. 7 gr is reserved for adhesive. As a result, the system corresponds to a weight of 247 g.
TESTING OF FINAL MODEL
MODEL
