WORLD FOR CIVIL

Statics & Strength of Materials

Problem Assignment (determinate) Stress/Strain 1

1. A 3/4 inch diameter steel cable hangs vertically and supports a 750 pound ball. Determine the stress in the cable. (1700 psi)

2. Find the stress in a 1.5 inch square cast iron rod that has a tensile force of 15,000 pounds applied to it. (6667 psi)

3. A concrete post has a 20 inch diameter. It supports a compressive load of 8.4 tons. Determine the bearing stress of the post in pounds per square inch. (53.5 psi)

4. A rectangular concrete column is 1.5 feet by 2.5 feet. It supports a load of 72,000 pounds. Determine the bearing stress of the post. (133 psi)

5. A cast iron pipe with a 6 inch outer diameter and a 1/4 inch wall thickness carries a load of 3200 pounds. Determine the compressive stress in the pipe. (708 psi)

6. A construction crane has a 3/4 inch diameter cable. The allowable working stress for the cable is 20,000 psi. Determine the maximum load that the crane can lift. (8840 lb)

7. A short fir 4x4 has an allowable compressive stress of 1200 psi. parallel to the grain. Determine the maximum load that the 4x4 can carry. (19,200 lb)

8. A 24’ x 36’ house with full basement rests on 18" wide concrete footings. The entire house weighs 65,000 pounds. Determine the bearing stress on the soil beneath the footings. (~ 2.5 psi)