safety design in high‐rise...
TRANSCRIPT
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2011
Safety Design in High‐Rise ConstructionJohn Lee
April 26, 2011 – 280 Broadway, 6th
Floor Training Room
build safe | live safe
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The NYC Department of Buildings is a registered Provider with The
American Institute of Architects Continuing Education Systems (AIA/
CES). Credit earned on completion of this program will be reported to
AIA/CES for AIA members. Certificates of Completion for both
members and non‐AIA members are available upon request.
This program is registered with the AIA/CES for continuing
professional education. As such, it does not include content that may
be deemed or constructed to be an approval or endorsement by the
AIA of any material of construction or any method or manner of
handling, using, distributing, or dealing in any material or product.
Questions related to specific materials, methods, and services will be
addressed at the conclusion of this presentation.
Best Practices
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Course Objectives
•
Participants will be able to learn fire protection requirements for high rise buildings
•
Participants will be able to assess special requirements for egress in high rise buildings
•
Participants will be able to navigate the code with respect to special use and occupancies
•
Participants will understand recently enacted local laws that affect safety during high rise construction of high rise buildings
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Today’s Agenda
•
Participants will be able to understand the special fire protection systems required for high‐rise buildings
•
Participants will be able to identify the egress provisions of the code for high‐rise buildings
•
Participants will be able to apply the structural integrity provisions for high‐rise buildings based upon
occupancy and seismic importance
•
Participants will be able understand the changes to the International Codes for high‐rise buildings and
the relationship between the New York City code and the International Code
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New York City
New York is a city of high‐rise buildings
Home to many of the world’s first and tallest buildings
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International Code Council
•
NYC has adopted the International Code Council body of construction codes
•
NYC is an active participant in the code development process
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High‐Rise Buildings
Specifically addressed in section BC 403
•
Defined as having occupied floors located more than 75 feet above the lowest level
of fire department vehicle access
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High‐Rise Buildings
75 ft75
ft
1968 Code: 2008 Code: X
75 ft
75 ft
Average Curb Elevation Lowest Level of FD Vehicle Access
1968 Code: 2008 Code:
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Automatic Sprinkler Systems
•
Required in all buildings with floors > 55 feet in height and with an occupant load > 30
•
Required in all high‐rise buildings regardless of occupant load (as defined in BC 403)
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Fire Detection & Fire Alarms
High‐rise buildings are required to be provided with:
•Automatic fire detection connected to automatic fire alarm system
•Emergency voice / alarm communication system
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Voice Communication Systems
ALL
high‐rise occupancies require two‐way voice communication systems for use by
FDNY
Except: I‐1, I‐2 and R‐2 occupancies
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Voice Communication Systems
High‐rise residential buildings > 125 ft must have one‐way voice communication systems
•Required from the lobby panel to each dwelling unit and vertical exit
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Fire Command Center
Required in ALL
high‐rise occupancies in the lobby on the entrance floor for Fire Department operations
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Emergency Power Systems
Required in high‐rise buildings and residential buildings > 125 feet to provide back‐up power for emergency systems
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Elevator Lobbies
•
When elevators open onto a fire‐resistance‐ rated corridor
OR•
When elevators serve a Group B occupancy
with four or more stories
Elevator
Smoke PartitionElevator LobbyFire Rated Corridor
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Impact Resistant Stairs/Elevators
Stair and elevator enclosures in high‐rise buildings must be constructed of impact‐ resistant walls
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Stair Design
Wider Stairway Width
44”
min. stairway width required in ALL occupancies except :
•Stairways that handle 50 persons cumulative for all stories
•R‐2 occupancies not more than 125’
high and each stairway serves < 30 occupants per
floor
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Stair Design
•
Ease of Step
•
7”
max. risers and 11”
min. treads required in ALL occupancies except:
oR‐2 occupancies
oR‐2 dwelling units
oR‐3 residential occupancies
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Smoke‐Proof Enclosures
Open Exterior Balcony
Exterior Wall
Fire‐Rated Enclosure
Open Exterior Balcony
Fire‐Rated Enclosure
44”
Opening to Exterior
Exterior Wall
72”
Naturally Ventilated Vestibule
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Post‐Fire Smoke Purge Systems
•
Required in all high‐rise buildings and other buildings listed in section BC 912
•
Intended for the timely restoration of operations and overhaul activities once a fire is
extinguished
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Elevators as Means of Egress
May be used as a component of accessible meansof egress, except in:
1.
Residential buildings > 125 feet in height
1.
In other occupancies where the occupied floor is > 75’ above the lowest level of fire department access
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Photoluminescent
Requirements
All newly‐constructed high‐rise buildings, except R‐2 occupancies
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Super High‐Rise Buildings
Buildings taller than 300 feet:
•
Redundant automatic and gravity fed water supplies
•
Larger tank sizes for on‐site storage of water for fire fighting purposes
•
Dedicated express Siamese riser
•
Zoned system
On‐site secondary water supply required at buildings taller than 300 feet and in Seismic Design CategoryC or D
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Structural Design•
Proposed Structural Integrity Provisions
•
Applicable to all buildings
o
Vehicular Impact Design Load requirement, Section 1625.5
o
High‐pressure Gas explosion Design Load requirement, Section 1625.6
o
Continuity and Ties requirements – Requiring additional strength and detailing
of members and their connections
–
Steel Construction –Section 2213
»
Structural Steel Members
»
Composite Concrete Slabs on Metal Deck
–
Concrete Construction –Section 1917
»
Cast‐In‐Place Concrete
»
Precast Concrete
–
Masonry Construction –
Section 2114
»
Bearing walls
»
Piers & Columns
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Structural Design
Structural Integrity – Key Element Analysis
•
Key Element Analysis – Section 1626
•
Two Options:
oAlternate Load Path Method – Design to prevent a disproportionate collapse assuming a
“Key Element”
will fail due to an extreme event
oSpecific Local Resistance Method ‐
Design key elements for code prescribed loads
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Structural Design (cont)
Key Element Analysis required for:
•
Buildings more than 600 feet (183 m) tall or more than 1,000,000
square
feet (92 903 m2)
•
Essential Facilities larger than 50,000 square feet (4645 m2)
•
Building with an Aspect Ratio greater than 7
•
Buildings taller than 7 stories where one structural member supports
more than 15% of the aggregate building area
•
Buildings designed using non‐linear time history analysis or utilizing
special seismic energy dissipation systems (Base Isolation or Dampers)
Structural Peer Review by a qualified independent structural engineer also
required – Section 1627
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Building Under Construction
•
Standpipe Air Pressurized Alarms
Local Law 64 of 2009
•
Air pressurized alarms on standpipe systems at:
o
New buildings 75 feet+
o
Full Demolitions
•
Required:
o
Drawings of alarm system
o
Alteration 2 Standpipe Application & Permit
•
Testing
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Buildings Under Construction
•
Standpipe Hydrostatic Pressure Testing
Local Law 63 of 2009
•
Hydrostatic pressure tests must be performed on standpipes
at:
o
New buildings 75 feet+
o
Full Demolitions
o
Certain alteration work
•
Required:
o
Alteration 2 Standpipe Application & Permit
•
Testing
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Where Do We Go from Here?
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What’s Happening Outside NYC?
Changes to the ICC
•
ICC now requires impact resistant stair and elevator enclosures
•
ICC now requires photoluminescent
exit path markings
•
Fire service elevator and occupant evacuation elevators
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What’s Happening Outside NYC?
Changes to the ICC
Buildings taller than 420 feet:
•
Two
sprinkler risers serving each sprinkler zone
•
Three
exit stairs
oException for R‐2 (residential) buildings
oException for buildings with occupant evacuation elevator
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Questions?This concludes the American Institute of Architects
Continuing Education Systems Course
NYC Department of BuildingsBuildings University
AIA Point of Contact:Allison Ginsburg
[email protected]‐566‐4415