*label*Science

### Question Description

**please see attached**

**please show work**

**please make it organized and clear to read (very important) **

**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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## Tutor Answer

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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?

πππππππππππ ππππππ =

πππππ πππππππ

ππππ

=

= π. πππ

π

ππππ

ππ. π ππ

πππ

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

π€πππππ ππ πππ ππππππ = ππ β ππ = ππππ ππ = π. πππ ππππ

πππππ ππππππ ππ πππ ππππ πππππ = πππ + π, πππ = πππ. πππ ππππ

πππππππ ππππππ =

πππππ πππ. πππ

ππππ

=

= π. πππ π

ππππ

ππ β ππ

ππ

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

ππππ ππ ππππππππ ππππππππ = ππππππ β π
ππππππ

= (π β π)πππ β ππππ β

πππ

β πππ πππ = ππππππ = π. πππππππ

ππππ

πππππ ππππππ ππ πππ ππππ πππππ = πππ + π, πππ + π. πππ = πππ. πππ ππππ

πππππππ ππππππ ππ ππππππππ πππππππ =

πππππ πππ. πππ ππππ

ππππ

=

= π. πππ π

π

(π β π)ππ

ππππ

ππ

Problem #2

A- FIND THE FORCE IN MEMBER AC AND THE FORCE IN MEMBER BC (hint, the system above

is statically determinant)

πππππ π©π¨πͺ = πππππ πͺπ...

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