# structural systems assignment #1 Essay Answers

Problem#1

A W12x87 Steel Column, 14’tall is subjected to a load of 215 kips The cross sectional area of the column is A = 25.6 in^2

A- What is the compressive stress in the column?

B- Whet is the bearing stress between the steel base plate and the concrete footing?

C- Whet is the bearing stress between the concrete footing and the soil?

Problem #2
A- FIND THE FORCE IN MEMBER AC AND THE FORCE IN MEMBER BC (hint, the system above is statically determinant) B- FIND THE STRESSES IN MEMBER AC AND MEMBER BC.

C-WHAT IS THE STRAIN IN MEMBER AC? D- WHAT IS THE CHANGE IN LENGTH (IN INCHES) OF MEMBER AC AFTER ALDING THE LOAD (AND DOES IT STRETCH OUT CR COMPRESS?) – (ELONGATES, SHORTENS CIRCLE 1)

Problem #3

A 10,000 LB LOAD IS SUPPORTED BY A ONE INCH-DIAMETER STEEL ROD (E = 29,000 KSI) AS SHOWN ABOVE.

A. WHAT IS THE STRESS IN THE ROD?

B. WHAT IS THE STRAIN IN THE ROD?

C. HOW MUCH DOES THE ROD ELONGATE?

Problem #4

A- Find this Maximum Shear stress () in the Wood Beam above.

B- Circle which of the following is true(circle1)

C- If the maximum allowable shear stress is only 120 psd, does the saction have adequate strength?

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