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Section 403 High-Rise Buildings

Building Code 2021 of Illinois > 4 Special Detailed Requirements Based on Occupancy and Use > 403 High-Rise Buildings
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403.1 Applicability
High-rise buildings shall comply with Sections 403.2 through 403.6.
Exceptions: The provisions of Sections 403.2 through 403.6 shall not apply to the following buildings and structures:
  1. Airport traffic control towers in accordance with Section 412.2.
  2. Open parking garages in accordance with Section 406.5.
  3. The portion of a building containing a Group A-5 occupancy in accordance with Section 303.6.
  4. Special industrial occupancies in accordance with Section 503.1.1.
  5. Buildings containing any one of the following:
    1. A Group H-1 occupancy.
    2. A Group H-2 occupancy in accordance with Section 415.8, 415.9.2, 415.9.3 or 426.1.
    3. A Group H-3 occupancy in accordance with Section 415.8.
403.2 Construction
The construction of high-rise buildings shall comply with the provisions of Sections 403.2.1 through 403.2.3.
403.2.1 Reduction in Fire-Resistance Rating
The fire-resistance rating reductions specified in Sections 403.2.1.1 and 403.2.1.2 shall be allowed in buildings that have sprinkler control valves equipped with supervisory initiating devices and water-flow initiating devices for each floor.
403.2.1.1 Type of Construction
The following reductions in the minimum fire-resistance rating of the building elements in TABLE 601 shall be permitted as follows:
  1. For buildings not greater than 420 feet (128 m) in building height, the fire-resistance rating of the building elements in Type IA construction shall be permitted to be reduced to the minimum fire-resistance ratings for the building elements in Type IB.
    Exception: The required fire-resistance rating of columns supporting floors shall not be reduced.
  2. In other than Group F-1, H-2, H-3, H-5, M and S-1 occupancies, the fire-resistance rating of the building elements in Type IB construction shall be permitted to be reduced to the fire-resistance ratings in Type IIA.
  3. The building height and building area limitations of a building containing building elements with reduced fire-resistance ratings shall be permitted to be the same as the building without such reductions.
403.2.1.2 Shaft Enclosures
For buildings not greater than 420 feet (128 m) in building height, the required fire-resistance rating of the fire barriers enclosing vertical shafts, other than interior exit stairway and elevator hoistway enclosures, is permitted to be reduced to 1 hour where automatic sprinklers are installed within the shafts at the top and at alternate floor levels.
[BS] 403.2.2 Structural Integrity of Interior Exit Stairways and Elevator Hoistway Enclosures
For high-rise buildings of Risk Category III or IV in accordance with Section 1604.5, and for all buildings that are more than 420 feet (128 m) in building height, enclosures for interior exit stairways and elevator hoistway enclosures shall comply with Sections 403.2.2.1 through 403.2.2.4.
[BS] 403.2.2.1 Wall Assembly Materials—Soft Body Impact
The panels making up the enclosures for interior exit stairways and elevator hoistway enclosures shall meet or exceed Soft Body Impact Classification Level 2 as measured by the test method described in ASTM C1629/C1629M when tested from the exterior side of the enclosure.
[BS] 403.2.2.2 Wall Assembly Materials—Hard Body Impact
The panels making up the enclosures for interior exit stairways and elevator hoistway enclosures that are not exposed to the interior of the enclosure shall be in accordance with one of the following:
  1. The wall assembly shall incorporate not fewer than two layers of impact-resistant panels, each of which meets or exceeds Hard Body Impact Classification Level 2 as measured by the test method described in ASTM C1629/C1629M.
  2. The wall assembly shall incorporate not fewer than one layer of impact-resistant panels that meet or exceed Hard Body Impact Classification Level 3 as measured by the test method described in ASTM C1629/C1629M.
  3. The wall assembly incorporates multiple layers of any material, tested in tandem, that meets or exceeds Hard Body Impact Classification Level 3 as measured by the test method described in ASTM C1629/C1629M.
[BS] 403.2.2.3 Concrete and Masonry Walls
Concrete or masonry walls shall be deemed to satisfy the requirements of Sections 403.2.2.1 and 403.2.2.2.
[BS] 403.2.2.4 Other Wall Assemblies
Any other wall assembly that provides impact resistance equivalent to that required by Sections 403.2.2.1 for Soft Body Impact Classification Level 2 and 403.2.2.2 for Hard Body Impact Classification Level 3, as measured by the test method described in ASTM C1629/C1629M, shall be permitted.
403.2.3 Sprayed Fire-Resistant Materials (SFRM)
The bond strength of the SFRM installed throughout the building shall be in accordance with Table 403.2.3.
TABLE 403.2.3
MINIMUM BOND STRENGTH
HEIGHT OF BUILDINGa SFRM MINIMUM BOND STRENGTH
Up to 420 feet 430 psf
Greater than 420 feet 1,000 psf
For SI: 1 foot = 304.8 mm, 1 pound per square foot (psf) = 0.0479 kW/m2.
a. Above the lowest level of fire department vehicle access.
[F] 403.3 Automatic Sprinkler System
Buildings and structures shall be equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 and a secondary water supply where required by Section 403.3.3.
Exception: An automatic sprinkler system shall not be required in spaces or areas of telecommunications equipment buildings used exclusively for telecommunications equipment, associated electrical power distribution equipment, batteries and standby engines, provided that those spaces or areas are equipped throughout with an automatic fire detection system in accordance with Section 907.2 and are separated from the remainder of the building by not less than 1-hour fire barriers constructed in accordance with Section 707 or not less than 2-hour horizontal assemblies constructed in accordance with Section 711, or both.
[F] 403.3.1 Number of Sprinkler Risers and System Design
Each sprinkler system zone in buildings that are more than 420 feet (128 m) in building height shall be supplied by not fewer than two risers. Each riser shall supply sprinklers on alternate floors. If more than two risers are provided for a zone, sprinklers on adjacent floors shall not be supplied from the same riser.
[F] 403.3.1.1 Riser Location
Sprinkler risers shall be placed in interior exit stairways and ramps that are remotely located in accordance with Section 1007.1.
[F] 403.3.2 Water Supply to Required Fire Pumps
In all buildings that are more than 420 feet (128 m) in building height and buildings of Type IVA and IVB construction that are more than 120 feet (36 576 mm) in building height, required fire pumps shall be supplied by connections to not fewer than two water mains located in different streets. Separate supply piping shall be provided between each connection to the water main and the pumps. Each connection and the supply piping between the connection and the pumps shall be sized to supply the flow and pressure required for the pumps to operate.
Exception: Two connections to the same main shall be permitted provided that the main is valved such that an interruption can be isolated so that the water supply will continue without interruption through not fewer than one of the connections.
[F] 403.3.3 Secondary Water Supply
An automatic secondary on-site water supply having a capacity not less than the hydraulically calculated sprinkler demand, including the hose stream requirement, shall be provided for high-rise buildings assigned to Seismic Design Category C, D, E or F as determined by Section 1613. An additional fire pump shall not be required for the secondary water supply unless needed to provide the minimum design intake pressure at the suction side of the fire pump supplying the automatic sprinkler system. The secondary water supply shall have a duration of not less than 30 minutes as determined by the occupancy hazard classification in accordance with NFPA 13.
[F] 403.3.4 Fire Pump Room
Fire pumps shall be located in rooms protected in accordance with Section 913.2.1.
[F] 403.4 Emergency Systems
The detection, alarm and emergency systems of high-rise buildings shall comply with Sections 403.4.1 through 403.4.8.
[F] 403.4.1 Smoke Detection
Smoke detection shall be provided in accordance with Section 907.2.13.1.
[F] 403.4.2 Fire Alarm System
A fire alarm system shall be provided in accordance with Section 907.2.13.
[F] 403.4.3 Standpipe System
A high-rise building shall be equipped with a standpipe system as required by Section 905.3.
[F] 403.4.4 Emergency Voice/Alarm Communication System
An emergency voice/alarm communication system shall be provided in accordance with Section 907.5.2.2.
[F] 403.4.5 Emergency Communication Coverage
In-building, two-way emergency responder communication coverage shall be provided in accordance with Section 510 of the International Fire Code.
[F] 403.4.6 Fire Command
A fire command center complying with Section 911 shall be provided in a location approved by the fire code official.
[F] 403.4.7 Smoke Removal
To facilitate smoke removal in post-fire salvage and overhaul operations, buildings and structures shall be equipped with natural or mechanical ventilation for removal of products of combustion in accordance with one of the following:
  1. Easily identifiable, manually operable windows or panels shall be distributed around the perimeter of each floor at not more than 50-foot (15 240 mm) intervals. The area of operable windows or panels shall be not less than 40 square feet (3.7 m2) per 50 linear feet (15 240 mm) of perimeter.
    Exceptions:
    1. In Group R-1 occupancies, each sleeping unit or suite having an exterior wall shall be permitted to be provided with 2 square feet (0.19 m2) of venting area in lieu of the area specified in Item 1.
    2. Windows shall be permitted to be fixed provided that glazing can be cleared by fire fighters.
  2. Mechanical air-handling equipment providing one exhaust air change every 15 minutes for the area involved. Return and exhaust air shall be moved directly to the outside without recirculation to other portions of the building.
  3. Any other approved design that will produce equivalent results.
[F] 403.4.8 Standby and Emergency Power
A standby power system complying with Section 2702 and Section 3003 shall be provided for the standby power loads specified in Section 403.4.8.3. An emergency power system complying with Section 2702 shall be provided for the emergency power loads specified in Section 403.4.8.4.
[F] 403.4.8.1 Equipment Room
If the standby or emergency power system includes a generator set inside a building, the system shall be located in a separate room enclosed with 2-hour fire barriers constructed in accordance with Section 707 or horizontal assemblies constructed in accordance with Section 711, or both. System supervision with manual start and transfer features shall be provided at the fire command center.
Exception: In Group I-2, Condition 2, manual start and transfer features for the critical branch of the emergency power are not required to be provided at the fire command center.
[F] 403.4.8.2 Fuel Line Piping Protection
Fuel lines supplying a generator set inside a building shall be separated from areas of the building other than the room the generator is located in by one of the following methods:
  1. A fire-resistant pipe-protection system that has been tested in accordance with UL 1489. The system shall be installed as tested and in accordance with the manufacturer's installation instructions, and shall have a rating of not less than 2 hours. Where the building is protected throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1, the required rating shall be reduced to 1 hour.
  2. An assembly that has a fire-resistance rating of not less than 2 hours. Where the building is protected throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1 or 903.3.1.2, the required fire-resistance rating shall be reduced to 1 hour.
  3. Other approved methods.
[F] 403.4.8.3 Standby Power Loads
The following are classified as standby power loads:
  1. Ventilation and automatic fire detection equipment for smokeproof enclosures.
  2. Elevators.
  3. Where elevators are provided in a high-rise building for accessible means of egress, fire service access or occupant self-evacuation, the standby power system shall also comply with Sections 1009.4, 3007 or 3008, as applicable.
[F] 403.4.8.4 Emergency Power Loads
The following are classified as emergency power loads:
  1. Exit signs and means of egress illumination required by Chapter 10.
  2. Elevator car lighting.
  3. Emergency voice/alarm communications systems.
  4. Automatic fire detection systems.
  5. Fire alarm systems.
  6. Electrically powered fire pumps.
  7. Power and lighting for the fire command center required by Section 403.4.6.
403.5 Means of Egress and Evacuation
The means of egress in high-rise buildings shall comply with Sections 403.5.1 through 403.5.5.
403.5.1 Remoteness of Interior Exit Stairways
Required interior exit stairways shall be separated by a distance not less than 30 feet (9144 mm) or not less than one-fourth of the length of the maximum overall diagonal dimension of the building or area to be served, whichever is less. The distance shall be measured in a straight line between the nearest points of the enclosure surrounding the interior exit stairways. In buildings with three or more interior exit stairways, not fewer than two of the interior exit stairways shall comply with this section. Interlocking or scissor stairways shall be counted as one interior exit stairway.
403.5.2 Additional Interior Exit Stairway
For buildings other than Group R-2 and their ancillary spaces that are more than 420 feet (128 m) in building height, one additional interior exit stairway meeting the requirements of Sections 1011 and 1023 shall be provided in addition to the minimum number of exits required by Section 1006.3. The total capacity of any combination of remaining interior exit stairways with one interior exit stairway removed shall be not less than the total capacity required by Section 1005.1. Scissor stairways shall not be considered the additional interior exit stairway required by this section.
Exceptions:
  1. An additional interior exit stairway shall not be required to be installed in buildings having elevators used for occupant self-evacuation in accordance with Section 3008.
  2. An additional interior exit stairway shall not be required for other portions of the building where the highest occupiable floor level in those areas is less than 420 feet (128 m) in building height.
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