CIVL 1101 - Assignment #5

 Name: ________________________

 

"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).

  1. 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.