12-100proj1 - 12-100 Introduction to Civil and...

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12-100 Introduction to Civil and Environmental Engineering Spring 2008 Project 1. “Burning Bridges” Schedule Signup for time slots February 4 Testing of wood specimens February 6 Submission of plank calculations February 11, 5:00 P.M. Submission of preliminary report February 13, 2:30 P.M. Testing of planks February 13 Construction of cardboard structures February 6-12 Testing of cardboard structures February 13 Presentation of oral report February 20 Submission of final report February 25, 5:00 PM Introduction This project involves structures that bridge a horizontal span to support a load, and in doing so the major elements of structural mechanics will be introduced. Essentially, most bridges can be envisioned as beams , structural members capable of resisting internal bending moments . The simplest type of beam is a plank, and this project starts with the study of wood planks. The strength of a plank or beam, meaning the load it will carry before it fails, was another of the great problems of antiquity and the renaissance. It was understood that the load at failure would depend upon the span length, the size of the beam in cross-section, and the beam material itself. How can one predict (calculate) the load at which failure will occur? The answer that we use as modern engineers was developed between the 17 th and 19 th centuries, and is summarized by the principles of force vectors, free body diagrams, reactions on structures, internal bending moments, theory of elasticity, and stresses induced by bending. In our lectures and homework exercizes you will learn those principles, as well as relevant principles of statistics, and you will use them to answer the engineering questions surrounding the wood planks in this project. This project involves a series of three experiments. Your group will receive a set of six wood specimens and one wood plank. In the first experiment, on September 20, your group will test the six wood specimens to obtain the failure stress of the wood. From that information you will calculate pertinent statistics concerning the expected performance of your wood plank. In the second experiment, on September 27, your wood plank will be tested as a bridge, at which time it will either fail or survive. Between September 20 and 28 you will also design and construct a cardboard structure as a substitute for the wood plank; in the third experiment, on September 29, your cardboard structure will be tested as a bridge, at which time it will either fail or survive. The Bridge, its Location, its Span, and its Loading The floor in the Tung Au lab contains a hatch that opens to reveal a frightening drop. The planks and the cardboard structures must span 48 inches across that opening, and are intended to support your instructor, who weighs 180 lb, as he steps over the abyss.
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February 4: Signup for time slots On February 4 your group must sign up for time slots in which to build your cardboard structure. Therefore, you must communicate with your group members between February 1 and 4 in order
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This note was uploaded on 01/25/2010 for the course CE 12100 taught by Professor Irvin during the Spring '08 term at Carnegie Mellon.

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12-100proj1 - 12-100 Introduction to Civil and...

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