SECTION IV DISCUSSION - single length of lumber without any...

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SECTION IV DISCUSSION Our initial truss design included multiple isosceles triangles. Our initial plan of attack was to minimize material costs while keeping angles and lengths simple. It was brought up through discussion that a truss design of equilateral triangles placed inversely side by side would be much simpler, require less zero force members therefore requiring much less material in general, and waste much material due to multiple cuts. It was discovered that a truss composed of isosceles triangles would require over 28% more feet of lumber than a truss that was composed of equilateral triangles. From this knowledge one other sketch pertaining to the principles of isosceles triangles was quickly discarded. We thought that an isosceles triangle could be used with dimensions such that the base and a leg of the triangle could be cut from a
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Unformatted text preview: single length of lumber without any waste. This, however, complicated calculations due to working with lengths with large amounts of digits after the decimal and created problems due to not having precise measurements while rounding these dimensions. Instead, the basic principles of equilateral triangles were used effectively to simplify calculations. The fact that every member was of the same length and every angle was sixty degrees made the calculations much simpler and more uniform. This also made it easy to optimize the economics of the design. The lengths of the members were set at twelve feet so there would be no waste after construction due to unusable lengths leftover from cuts. This simple equilateral design also eliminated the need to cut the members when they arrive at the job site, thus saving time and energy....
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This note was uploaded on 05/12/2010 for the course CE 212 taught by Professor Renee during the Spring '10 term at Washington State University .

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