][ STEEL STRUCTURES ][

Student Name:__________________________________
SS#: _________________
	ARCH 5023/ ARCH 4333 - ARCHITECTURAL STRUCTURES I 

			][STEEL STRUCTURES][

	UNIVERSITY OF OKLAHOMA - COLLEGE OF ARCHITECTURE 

				EXAM 1
			        Friday 09.13.96

Please print clearly.
Show all work.
Include units of measurement.
Closed Notes
Manual of Steel Construction allowed
Simplified Engineering for Architects and Builders allowed 
2 (8 1/2"x11") Summary pages allowed.
Multiple-Choice: 
Clearly mark only one correct answer for each question: 
Each correct answer is worth 2 points

1. What does FE stand for? ( 2 points)
	a. x	iron
	b. 	copper
	c. 	free steel
	d.	field engineered

2. What is the minimum uniformly distributed live load for commercial facilities? ( 2 points)
	a.	20 lbs/sq.ft.
	b.	30 lbs/sq.ft.
	c.  	40 lbs/sq.ft.		for hospital rooms & wards 
	d. x	50 lbs/sq.ft

3. What primary division of the CSI Masterformat covers metals? ( 2 points)
	a.	1
	b. x	5
	c. 	6 
	d.	16

4. What is blister steel? ( 2 points)
	a.	iron found in casts
	b.	pig iron
	c. x	carbonized wrought iron 
	d. 	nearly pure iron

		                    				Student Name:_______________________	

5. When was iron first found? ( 2 points)
	a.	4,500 B.C.
	b. x	2,500 B.C.
	c. 	1,000 B.C. 
	d. 	400 B.C.

6. Which of the following was the first steel framed skyscraper? ( 2 points)
	a. x	Home Insurance Company Building in Chicago
	b.	Empire State Building
	c.	Seagram Building
	d.	Hershey Chocolate Museum of the Great Plains

7. What material was used to build the Eiffel Tower? (2 points)
	a.	steel
	b. x	wrought iron
	c.	cast iron
         	d. 	pig iron

8.  What is the min. design wind speed for Oklahoma according to code? ( 2 points)
	a.	40 mph
	b.	60 mph
	c. x	70 mph		80 mph for parts of the state
	d.	100 mph 	
	
9. What is the minimum uniformly distributed live load for any balcony? ( 2 points)
	a.	20 lbs/sq.ft.
	b.	30 lbs/sq.ft.
	c. 	40 lbs/sq.ft. 
          	d.  x	60 lbs/sq.ft
	
10. What ASTM standard specifies Structural Steel? ( 2 points).
	a.  x	A 36
	b.	A 53
	c.	A 615
	d.	A 767

11. What force governs the design in Oklahoma 1? ( 2 points)
	a.	seismic 
	b. 	snow
	c.  x	wind 
	d.	terrorists	
 	
12. What effect does nickel has as alloying element for steel? ( 2 points)
	a.	decreases strength
	b.	decreases stresses in the material
	c.	same general effects as manganese
	d. x	increases strength and corrosion resistance

		                    				Student Name:_______________________	

13. How can a Matte stainless steel finish be achieved? ( 2 points)
	a. x	produced in the mill by the use of special rolls
	b. 	polished
	c.	wire brushed
	d. 	unfinished surface, annealed and pickled

14. What does UBC stand for? ( 2 points) 
	a.	United Basic Code 
	b. x	Uniform Building Code	
	c.	United Nation Building Conference		
	d. 	Uniformed Building Constructors   

15. What is the maximum carbon content of high carbon steel? (2 points)
	a. 	< 0.01%
	b.	< 0.25%
	c. x	> 0.5 %
	d.	< 1.0 %	 	

16. What is the equivalent thickness in inches of 22 GA steel? (2 points)
	a.	1/16"		0.0625"
	b. x	1/32"		0.03125"
	c. 	7/64"		0.109375"
	d.	3/64"		0.046875"

Short Answer Questions:

17. Sketch a W structural steel shape.? (1.5 points each, 3 total)
		I

18. Name the raw materials required for steel production. (1 point each, 3 total)
	iron ore		(iron)
	coke 			(coal)
	limestone		(lime)

19. Name three (3) metal ("steel") framed buildings. (1 point each, 3 points total)
	Cadet Chapel at Air Force Academy,  Seagram Building, Eiffel Tower (not steel)
	Convention Center New York & Chicago, World Trade Center,
	Center Georges Pompidou, Empire State Building, Crystal Palace,
	Bavinger House, John Hancock Center, Sears Tower, US Pavilion Expo 1967,

20. Name three (3) alloying elements used to make specialty steel. (1 point each, 3 points total)
	chrome, nickel, manganese, 

		                    				Student Name:_______________________	
21. Sketch and name four (4) load types. (4 points)
	snow laod		dead load
	wind load		live load
	seismic load		thermal load
	dynamic load


22. What is the descriptive name, identifying symbol and typical designation for below? (3points)
			
	I	Wide Flange Shape	WF	W	W 36 x 300		


23. What three (3) basic things should you remember about structures? (3points)
	Gravity exists, God is in the detail, loads & members, 
	The golden rule - he who has the gold makes the rule - economic 
	primary structural members ( vertical = column) (horizontal=beam)
	
24. Identify the three (3) steel making processes below? (3 points)
	Basic Oxygen Furnace
	Electric Furnace
	Open Hearth Furnace


25. Identify the three (3) semifinished steel shapes shown below. (3 points)

	Slabs			====
	Blooms			==
	Billets			=
				

26. Sketch a structural steel member and name it? (3 points total)  
	I  (I-beam)		w-shape 
           	[			c-chanel
	o (	(		tubes

27. Sketch a structural design to place a person 30'-0" high in the air. (4 points total)  
		(on back of page)
	crane, platform, inflated structure, 1 colums, 3 supports, tent, etc.

		                    				Student Name:_______________________	
Calculations: 
Indicate what is given, asked, and what your solution is underline your answers.
Show all work, include formulas and units of measurement. 

28. Problem: (12 points)
Calculate the dead load of the following roof structure.


20 GA	steel deck				2.0 psf	1.5points

Rigid foam insulation 				1.5 psf	1.5points

mtl. purlins (assumed by student)			1.0 psf	1.5points

steel joists (assumed by student)			1.5 psf	1.5points

suspended steel channels				1.0 psf	1.5points

dry wall gypsum board 1/2"			2.5 psf	1.5points 

suspended lighting and 				3.0 psf	1.5points
air distribution systems 
___________________________________________________________________

Total roof dead load				12.5 psf	1.5points
						======


		                    				Student Name:_______________________	
Calculations: 
Indicate what is given, asked, and what your solution is underline your answers.
Show all work, include formulas and units of measurement. 

29. Problem: (21 points) 

A wide flange is supporting a floor system with a dead load of 18 psf and a commercial floor live load of 60 psf. The floor area supported by the structural member is 22 ft by 44 ft.  What is the allowable load reduction factor for the steel column supporting this one story building?

A. Given:
1p	A = area of floor supported by a member 
		  in sqft
	A = 22 x 40 = 880 sqft	
1p	D = unit dead load/sq ft of supported area
	D = 18 psf
1p	L = unit live load/sq ft of supported area
	L = 60 psf
		
Graph:  4p
(If you missed the graph you can still earn the 
4 points if you show a graph in the next exam)
				40'-0"    L= 60 psf
			     -----------------------
			    /    		     /
			   /                           /   18'-0"	
			  ----------------------
			               I  	   D= 18 psf			
B. Asked:
1p	R = reduction in percent [%]

C. Calculation:
1.	No reduction allowed for:
		assembly theater buildings
		live loads greater than 100 psf
2.	Reduction allowed according to:

3.	R = 0.08 (A[sqft] - 150[sqft]) 1 p
4.	R = 0.08 (880 [sqft] - 150 [sqft])
5.	R = 0.08 (730 [sqft])
6.	R = 58.4% 1p
	but
7.	R <40% 1p
 
	Reduction shall not exceed:
8.		40% for horizontal members  1p
9.		40% for vertical members receiving 1p
				load from 1 level only
10.		60% for other vertical members 1p
		nor R as determined by the 
			following formula
11.		R = 23.1 ( 1 + D[psf]/L[psf]) 1p
12.		R = 23.1 ( 1 + D[psf]/L[psf])
13.		R = 23.1 ( 1 + 18[psf]/60[psf]) 1p
14.		R = 23.1 ( 1 + 0.3)
15.		R = 23.1 * 1.3                   1p
16.		R = 30.03 % governs        1p
		==========
17.		R = 48% does not govern 1p
18.		R = 40% does not govern 1p
   	
D. Answer:
19.		R = reduction in percent
		The total live load to be used for design
		of a member may be reduced by %.
		R = 30.03 1p
		==========
		30 % would also be an acceptable answer
		31 % would be the wrong answer