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EAS 102 Final Project Report

EAS 102 Final Project Report - Introduction/Executive...

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Introduction/Executive Summary People been fabricating bridges for thousands of years and in today’s society, there is just as much of a demand as ever. Each bridge is designed and maintained differently; it is designed to meet the specific needs and constraints placed upon it by its designer. This paper will outline the bridge we built, from the specifications, to the design methods, procedures, problems we faced, analyses, experimentation, and our results. The specifications and constraints put upon us were as follows. We had to build a truss bridge that would span 12 inches, but be no longer than 16 inches, no more than 6 inches tall, and could span no more than 5 inches below the platform. It had to hold at least 160 pounds and it was supposed to be of a minimum weight. The bridge had to allow for a HO-scale-model (1:87 scale) railroad track and train to pass through it, unimpeded. To insure accuracy of the model, all connections had to be pinned, no members could be longer than 4 inches, and the bridge had to be constructed of 80%, by mass, pulp and paper products. In order to complete this task, our team used a modified Howe truss design to accommodate the requirements and constraints set before us. This approach was a good on because we could use the strengths of the Howe truss (it’s reliability, ease of construction, and lightweight properties), but also adapt it to more fully fit our needs. This resulted in a strong lightweight bridge that met the 160-pound load requirement as well as all other requirements. Project Description This project required our group to analyze trusses and develop a bridge that could efficiently carry a load up to one hundred and sixty pounds. The main challenge at hand was to make a light-weight and low-cost bridge that could effectively accommodate an HO-scale railroad track with weight being
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applied. Originally “low-cost” meant that everything we used in our bridge had to be completely free, this was changed to having a fifty dollar budget to Ace Hardware. This fifty dollar budget became extremely useful as we realized that using all paper would most likely not hold the required weight.
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