Chapter 05 - Study Problem - Means of Egress with answers
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Apr 3, 2024
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Chapter 5: Study Problem #1
Using the stair diagram shown in Figure 5.5, 5.6 in text book, fill in the typical code requirements for each of the following in the spaces provided. Be sure to indicate whether you are using inches or millimeters. Add the words minimum and maximum where applicable if you want points. Be very distinct. .
This is a commercial building. Remove lines to give answer. Use a different font color for answers. Get answers from TAS.
Riser height: _______
7 inch
________________________________________________
Tread depth: _____
11 inches
______________________________________________________
Nosing projection: __
1 – 1/4 “ maximum
_ unless there is a slight slope 1-1/2”
Review TAS 303.2/.3
Stairway rise without landing: ____
12 foot max
_____________________________________
Height of handrail: __
34-38 inches
___________________________________________
F. Top handrail extension: ___
12 inches
_________________________________
Bottom handrail extension: __
one tread width or 12 inches
_______________________
Diameter of Type I circular handrail: _1 ¼ Inches to 2”__________________________________
Minimum headroom height: __
80 inches
________________________________________
Figure 5.1 Section/Elevation of stairs.
Study Problem #2
The diagram shown below is a line drawing that represents a section of a fully sprinklered high
‐
rise building. It is a new building, with the first floor at grade level. You are given the occupant load and the use group for each floor. Use the diagram and the information you are given to answer the questions in this two
‐
part problem.
1.
Use the occupant load for each floor shown in the following chart, and Table 1004.5 in the IBC, Minimum number of Exits of Access to Exits per
Story, List the quantities in the space provided. Remember what you learned in class about the stories above.
Figure 5.2 Number of exits: High
‐
rise building (sprinklered building).
Basement: _______
2
__________
First Floor: _______
4
________
Second Floor: ____
4
__________
Third Floor: _______
4
______
Fourth Floor: ____
4
___________
Fifth Floor: _____
3
___________
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Sixth Floor: _________
3
_______
Seventh Floor: _____
3
_________
Eighth Floor: ______
2
________
Explanation: When determining the number of exits for an entire floor, remember that the quantity is also affected by the number of occupants on the floor(s) above. In this problem, the fourth floor had the highest occupant load (over 1000 = 4 exits). Since the number of exits cannot decrease as a person travels toward the exit discharge, there must be four exits on the third, second,
and first floors as well (even though these floors by themselves do not need this
many exits). The fifth floor requires three exits (500 – 1000 = 3 exits). The sixth floor needs only two exits (1 – 500 = 2 exits). But since the seventh floor above requires three, the sixth floor requires three exits
as well. The eighth floor is not affected by any other floor. The number of exits in the basement is not affected by the floors above, since it is below the main exit discharge at grade level. (Note, however, that when calculating the width of the exits, the occupant load of the basement may affect the exits on the first floor.)
2.
Refer to International Building Code (IBC) Tables listed below “Spaces with One Exit or Exit (Be sure to refer to the notes at the bottom of the code tables). Answer the following questions using these code tables and information shown in the diagram in Figure 5.2. Note which code table was used to determine your answer. Write your answers in the spaces provided. (A multiplier for metric conversion is given at the bottom of the
tables.)
A.
What is the maximum travel distance allowed on the first floor in Figure 5.2?
Distance: ____________
250
__________________
Code Table: __________
Table 1017.3
__________________
B.
What is the maximum travel distance allowed on the second floor in Figure 5.2?
Distance: _____
250
________________________
Code Table: ____
Table 1017.3
___________________________
C.
For retail shops located in a sprinklered two
‐
story building with one exit at each level, what would be the allowable travel distance?
Distance: _________
75 feet
______________________
Code Table: _____
Table 1006.3.4
________________________
3. You have a building illustrated in Figure 3
(below) on the second floor
of a two story building. It is a mixed used occupancy
. Non sprinklered building
. You are to figure the O.L. of each tenant, plus give the O.L. of the entire building, state how wide the stairs need to me based on your knowledge of the code. In addition determine how many doors and the size of the doors at each end of the hall. 3. 2
nd floor of a 2 story
mixed use –
Non sprinkled building. Name Occupancy Classificatio
n Sq. footage Load Factor Total O.L. Arch. Firm Business 2,000 150 13.3 (14) Bank Business 2400 150 16 Museum Assembly A-
3 2400 30 80 Retail Mercantile 1500 60 25 ACC office Business 2500 150 16.6 (17) Clinic Outpatient Business 3,000 150 20 Drug Store Mercantile 1500 60 25 FILL IN THE CHART BELOW
Name
Occupanc
y Classificat
ion
Sq. footage
Load Factor
Total O.L.
A
.
Arch. Firm
Buss 2,000
150
14
B
.
Bank
Buss
2,400
150
16
C
.
Museum Assembly
3
2400
30
80
D
.
Retail
Mercantil
e
1500
60
25
E
.
ACC office
Business
2500
150
17
F
.
Clinic Outpatient
Business
3,000
150
20
G
Drug Store
1500
60
25
.
Mercantil
e
A.
What is the total O.L. for that entire floor _____
196-197
_________
B.
How many inches of doorways do you need for that floor __________ & how many doors would you need at each end and size of door.
Need a minimum of 2 remote exits due to over 50 and below 500. Take 197 X .2 – found 1005.3.2 in IBC =39.4. Divide that by 2 (because of the remote exits = 19.7. But we have learned that to meet ADA/ TAS in Texas we must have 36” doors. C.
How many inches of stairs do you need for that floor ___59.1_________ what is the width dimension of each set of stairs of the building. Stairs
look at 1005.3.1 . Take the OL of 197 X .3 = 59.1. We already know we have to have to remote exits/ stairs. Now take 59.1 divide by 2 for the number of stairs. Remember the minimum width of accessible stairs is 48” between railing. D.
In reviewing Table 1017 What is the maximum travel distance from each of the spaces to the exit before the stairs? (list and state)
Bussiness is 200’; Merchantile is 200’, Assembly is 200’
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