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ARCH5023/ARCH4333 - ARCHITECTURAL STRUCTURES I

][ STEEL STRUCTURES ][
THE UNIVERSITY OF OKLAHOMA - COLLEGE OF ARCHITECTURE
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EXAM 2

Student Name:	__________________________________
SS#: 			__________________________________

ARCH 5023/ ARCH 4333 - ARCHITECTURAL STRUCTURES I 
		][STEEL STRUCTURES][ 
UNIVERSITY OF OKLAHOMA - COLLEGE OF ARCHITECTURE 

EXAM 2
Friday 10.03.97

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 is the advantage of S shapes over W shapes for beam applications? ( 2 points)
	a.	thinner web
	b.	thinner flange
	c.  	thicker web 
	d.	thicker flange 

2. When are I beams used instead of bearing plates? ( 2 points).
	a.  	when you switch from two single 8' garage doors to one 16'-0" door
	b.	when window openings exceed the overall wall length
	c. 	when the length of the bearing plate becomes excessive
	d.	when federal building codes override local ordinances

3. What is the primary concern in the design of a steel beam? ( 2 points)
	a.	shear
	b. 	lateral support
	c. 	bending strength and deflection
	d.	web crippling

4.  What determines the width of a beam bearing plate? ( 2 points)
	a. 	width of wall
	b.	cost of steel
	c. 	grade of steel
	d.	laterally unsupported overall critical length of ASTM specified radius of gyration   	

5. What is the maximum allowable bending stress for braced A36 steel beams? (2 points)
	a.	10 ksi
	b.	14.5 ksi
	c.  	17.4 ksi 
	d. 	24 ksi	

6. What is the maximum allowable shear stress for un-reduced A36 steel 	beams? ( 2 points)
	a.	10 ksi
	b. 	14.5 ksi
	c. 	17.4 ksi 
	d.	24 ksi

7. What is the maximum acceptable live load deflection for a steel beam according to AISC? (2p)
	a.	L / 240
	b.	L / 300
	c.  	L / 360 
	d.	L / 480 

8. What is the k distance in inches for a W 18 x 35 ? ( 2 points)
	a.	5.56"
	b.	2.81"
	c. 	2.00" 
	d. 	1.13"

9. What is the Web Thickness for a W 36 x 300 ? (2 points)
	a.	0.360 "
	b. 	0.500 "
	c. 	0.945 "
         	d. 	3.000 "

10. What is weight per linear foot of a ASTM A36 W 8 x 24? (2 points)
	a.	8 lb/ft
	b.	16 lb/ft
	c. 	24 lb/ft
	d.	36 lb/ft

11. What material can be sprayed on for fireproofing of steel beams? ( 2 points)
	a.	masonry
	b.	concrete
	c. 	lath 
          	d.  	fibrous and cementatious coatings 

12. What is minimum yield stress for ASTM A36 steel beams? ( 2 points) 
	a.	19 ksi 
	b.	22 ksi	
	c.	29 ksi
	d. 	36 ksi

14. Which force rarely governs the design of steel beams? ( 2 points)
	a.	deflection 
	b. 	shear
	c.	bending moment 
	d.	section modulus	

15. What is the allowable bearing pressure for a steel beam bearing on  the full area of 3000 psi concrete? ( 2 points)
	a.	225 psi
	b. 	500 psi
	c. 	750 psi	
	d.	1125 psi

16. What is the actual depth of a ASTM A36 W 21 x 147 ? (2 points)
	a. 	2.1"
	b.	14.7"
	c.	21"
	d.	22.06"	 	

17. What is the maximum width N of the beam bearing plate, if the steel beam is supported on a
	standard width concrete block  basement wall. ( 2 points)
	a. 	4"
	b. 	6"
	c.	8"
	d. 	12"


Short Answer Questions:

18. Name three (3) ways to determine deflection (1 point each, 3 points total)




19. Sketch a W 8 x 24 and Identify the following dimensions on the drawing. (1 point each + 1 point for sketch = 4points total)






20. Sketch a bearing plate and identify the  three (3) critical dimensions on the drawing. (1 point each, + 1 point for sketch = 4 points total)





21. What can be done to prevent crippling of a steel beam web if the maximum interior load has 
	been exceeded, indicate on sketch ? (1 point each + 1 point for sketch = 4 points total)  






22. How can the fire rating of the I-beam below be increased? (1 point each = 4 points total)









23. Sketch a horizontal steel member to span 20' (2D or 3D) and identify the material? ( 4poitns)










24. Sketch the end support of an I beam resting on a concrete basement wall? ( 4 points)









25. You are the construction manager for Manhattan and need to order an I-beam from
	WW-steel what information do you need to fax to them? ( 3 points)




26. You can optimize a steel beam based on which (2) factors? ( 1.5 points each = 3 total)


Calculations: 
Indicate what is given, asked, graph and what your solution is underline your answers.
Show all work, include formulas, units of measurement and page number of table used. 

27. Problem: (12 points)
A W 21 x 57 beam of A 36 steel has an end reaction of 40 kips
that is developed in bearing over a length of N = 8 inches
Check the beam for web crippling. 

Calculations: 
Indicate what is given, asked, graph and what your solution is underline your answers.
Show all work, include formulas, units of measurement and page number of table used. 

28. Problem: (10 points)
A W 21 x 57 member of A36 Steel transfers an end reaction of 50 kips (196 KN)
to a wall built of 2000 psi poured concrete by means of a bearing plate of A36 steel, resting on the full wall thickness of 8 in.
Design the bearing plate

Calculations: 
Indicate what is given, asked, graph and what your solution is underline your answers.
Show all work, include formulas, units of measurement and page number of table used. 

29. Problem: (6 points)
The College of Architecture will be expanded in the comming year, we will add another set of
class rooms to the south side of the building for this a 24'-0" long  W 12 x 22 member of A36 Steel will be connected to the existing concrete structure. The beam is braced every 4'-0"
What is the allowable load for the selected beam?