Bridges

INFLUENCE OF THE DESIGN         ON THE STRENGTH OF A BRIDGE direct         The purpose of this project is to comp be three different designs spanning over a short constant distance. The materials for all the yokes pull up stakes be constant as well. I try outament be comparing the obligate, cable stayed and the transport bridge to determine which event of design will hold the heaviest load.

HYPOTHESIS         My hypothesis is that the truss bridge would be much stronger than the other two bridges. My seek indicated that truss bridges can support very gravid loads, most bridges that railroads are built on are truss bridges and the send bridges are bonny if you are carrying light loads over short distances.

try out DESIGN         The constant in this study will be the distance the bridges will span, the height, the materials used in the construction, and the counseling the bridges will be tested. The manipulated variable will be the design of the bridges. The resulting variable will be how much chew each bridge design will support. The resulting variable will be measured in pounds.

MATERIALS Balsa Wood strips 1/4 inch wide Pine center beam for cable stayed bridge 1/10 inch mystifying wood for bridge road base Fishing beginning - 50 lb. Test, .



029 diameter Bottle of glue encumbrances used to test strength of the bridges 2, 2½, 3, 4, 5 and 10 pounds Weight scale subjoinitional weights were improvised using heavy books          PROCEDURES 1) collect materials 2) Built the three bridges 149/16 inches long and 4½ inches wide 3) Build two end bases to hold the cheek of the bridges 4) Take pictures of the beam, truss, cable-stayed bridges 5) Begin testing the cable-stayed bridge first 6) Add weights to the cable-stayed bridge 7) Take pictures of cable-stayed bridge 8) Add more weights to the cable-stayed bridge, and take more pictures 9) Begin testing the beam bridge 10) Add weights to beam bridge 11) Take pictures of...

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