"It's not that I'm so smart, it's just that I stay with problems longer." - Albert Einstein

Objective

The purpose of this assignment is twofold: first, you will get familiar with the fundamental ideas of stress and strain, and second, calculations you will used in Project 2. 

You must hand in a copy of the cover sheet for the assignment and your solutions to Part 1 on engnieering paper. There are no Canvas submissions for this assignment.

Part 1

1. Determine the maximum elongation in a 100-foot steel cable if the maximum strain is 0.003 and the allowable tensile stress is 60,000 psi. Assume the modulus of elasticity of steel is E = 29,000,000 psi.
   
   
2. What is the average failure stress for 5 concrete specimens molded in 3" x 6" cylinders where the ultimate loads were 27,100 lb., 28,500 lb., 27,500 lb., 28,100 lb., and 27,800 lb., respectively?
   
   
3. If 2 cubic yards (yd³) of concrete are ordered for the project, estimate the weight of cement, fine aggregate, coarse aggregate, and water required for a 1:2:3 mix with a w/c = 0.4 (assume concrete weighs 150 lb./ft³).
    

4. Determine the amount of cement, fine aggregate, coarse aggregate, and water required to mix and construct five beams, each having the dimensions shown in the figure below. Include a "make-sure-you-have-enough" factor of 1.3 in your mix calculations. Assume a w/c ratio of 0.4 and a mix design of 1:2:2. The concrete weighs 145 lb./ft³. All weights should be reported in 0.05 lb. increments (just like in the lab).
   

5. Rework Problem #4 to determine the amount of cement, fine aggregate, coarse aggregate, and water required to mix and construct two beams, each having the dimensions shown in the figure above, and five 3" x 6" cylinders. Include a "make-sure-you-have-enough" factor of 1.2 in your mix calculations. Assume a w/c ratio of 0.45 and a mix design of 1:3:2. The concrete weighs 145 lb./ft³. All weights should be reported in 0.05 lb. increments (just like in the lab).

Part 2: Read Chapters 3 and 4 in the Strategies for Creative Problem Solving by Fogler and LeBlanc.

Cover sheet for homework

This website was originally developed by Charles Camp for CIVL 1101.
This site is Maintained by the Department of Civil Engineering at the University of Memphis.
Your comments and questions are welcomed.