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Week 13 Due Monday 12/6

For Homework this week you should complete the following questions from the end of the 4 chapters we worked on in class.  For each of the four chapters, you should answer the questions labelled "Designing with math and science", "connecting the dots" and "what do you think?"

To save you having to bring books home, here are the questions you need to answer:

CH 11:
*4. Describe at least three structural components that contribute to the dead load of your school building.  Describe at least three components that contribute to the live load.

*5. What is the minimum dead load (in tons) of a steel bridge that must carry 100 tons of traffic?  What will be the total load of that bridge?

*6.  A scaffold has a dead load that is 60 percent of its total load.  If the scaffold weighs 1,200 pounds, how much live load is it supporting?

*7.  Define compression and tension.  Would the rope in a tug-of-war contest experience compression or tension?

*8. Describe how bending occurs in a diving board with someone standing at one end.  You may want to draw a sketch to help you.

9. In "The Art of Engineering," Robert Hartmann described how an object's "look and feel" is as important as its function.  Would Kirk Elwell agree?  Give evidence to support your answer.

CH 12:
*4.  What is shear?

*5. What is a truss and how does it minimize the effects of a shearing force?

*6.  Why is it necessary for Bill to design the Burj Dubai so that it "confuses" the wind?

*7. Is concrete better for minimizing the effects of compression or tension?  What is special about the concrete that Bill is using as a construction material for the Burj Dubai?

8.  How does the Burj Dubai reflect a New Urbanist's approach to city planning?

10.  What do you think the superstructures of the future will be constructed of?  What is special about these materials?

CH 13:
*4. You are a structural engineer working for a design firm, and you have been given the task of designing a scaffold that can support a load of 300 pounds.  The scaffold must have a safety factor of 
two.  How many pounds should your design be able to support?

6.  Prity explains that she learned a lot about the construction industry by asking questions of the people she was working with.  Describe a time when you have had to ask a lot of questions tpo learn what you needed to learn in order to do a job or assignment well.

CH 14:
*4.  Look at the stress-strain curve below.  How much does the material strain under 25 psi of stress?  Will the material return to its original shape after a stress of this magnitude has been applied?

*5.  What is the elastic limit of the material and how can you tell?  How will the material behave under loads higher than the elastic limit?