Bellevue Ambulatory Care Pavilion
462 First Avenue  New York, NY 10016

   David Sivin - Mechanical Option
 
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 Building Statistics

Building Name:  Bellevue Ambulatory Care Pavilion

Location and Site:  462 1st Avenue (between 26th and 28th Street) – East Side of Midtown Manhattan

Building Occupant Name:  Dormitory Authority State of New York

Occupancy of Function Types:  E

Total Square Feet:  207,000

Number of Stories Above Grade/Total Levels: 5 Stories (6 total)

Project Team:

Dates of Construction:  May 2003 – February 2005

Actual Cost Information:  $75,000,000 (total cost)

Project Delivery Method:  Design-Bid-Build

Architecture:  The Bellevue Ambulatory Care Pavilion serves as an exam room, outpatient care and hospital personnel office space center for the previously built Bellevue Medical Center.  The recently constructed five story pavilion is connected to the old medical center by an curtain wall encased atrium that extends up roughly 90 feet.  From inside this atrium, you can see how the façade of the old hospital center connects to the modern care pavilion; rather than two eras of architecture clashing with each other, the two structures fit well together to make a remarkable aesthetic feature.

Major National Codes:  NFPA, IBC 2003, NYC Building Code 2002, NYC Seismic Code

Zoning:

  • Zone:  R-8
  • Zoning Map:  8d
  • Construction Type:  I-B
  • Max Floor Area Ratio (FAR):  6.50
  • Top of Highest Parapet:  +107’-5 3/16” – okay

Historical Requirements:  Maintain the façade of the old building in the new atrium with the exception of removing window AC units and renovating the ground floor windows to accommodate the atrium smoke purge system.

Building Envelope:

  • Roof:  Fluid applied protected membrane on top of roof slab, under 4” polystyrene insulation, with stone ballast covering over.  In areas near roof drains and penetrations, uncured neoprene roof sheet added.  In other areas, 2’x2’x2” concrete pavers on pedestals replace stone ballasts.
  • Curtain Wall:  Aluminum and 1” HS Low Emission Insulating Glass on the windows and curtain wall west façade along 1st Avenue
  • Masonry:  Face brick masonry with air vapor barrier in front of rigid polystyrene insulation and concrete masonry units.  Certain exterior masonry walls with additional concrete shear walls.

Mechanical Systems:

Since the Ambulatory Care Pavilion shares functions with the older parts of the Medical Center, some of its energy systems and sources root themselves in the systems of the older building.  Instead of having a local chiller plant, the Pavilion has 1920 gpm of 41ºF chilled water/glycol mixture transported to eleven on-site air handling units via 2 chilled water booster pumps.  The older 9000-ton chiller plant consists of one steam powered (Figure 2) and three electric powered chillers which supply chilled water/glycol to all parts of the Bellevue Medical Center, old and new.  Also, the condenser water supply comes from a module of 8 rooftop cooling towers at the older medical center.  The eleven air handling units, which supply anywhere from 3,500 to 40,000 CFM of 51.6ºF to 95.8ºF conditioned air and range from a capacity of 194 of 2192 mBH, serve all spaces of the Ambulatory Care Pavilion. Four 40,000 CFM air-handling units serve the clinical care area (mainly exam rooms and offices) and two 40,000 CFM units serve the main atrium. Conditioned supply air combines into main headers and divides up into spaces via pressure independence modules, VAV boxes and CV boxes then distribute the air to the occupied spaces as designed.  For heating purposes, steam at 5 psig flows through the heating coils in 10 of the 11 air-handling units while a 450 gpm shell and tube heat exchanger supplies hot water to the 11th air-handing unit, various unit heaters and VAV-reheat coils throughout the building.

Electrical Systems:

The Ambulatory Care Pavilion’s electrical supply power, like the chilled water supply system, taps into the electrical systems of the older Bellevue Medical Center.  Electrical service from the Bellevue Medical Center steps down via two 750 kVA to 208/120Y transformers.  Two main feeders (one set of 40-500KCM from a 2500A switchboard and one set of 40-400KCM from a 2000A switchboard) switch to line side of the switchboards.  From these switchboards, three 200 foot feeders which consist of 16 400KCM and 96 500KCM conductors in total, run to four main switchboards in the basement of the Ambulatory Care Pavilion.  At this point, two main conduit banks run feeders from the basement switchboard room into two electrical riser rooms and to distribution panels throughout the building.  A 1000 KW 208/120 V, 3 phase, 4 wire emergency generator sits in an outdoor area of the penthouse floor for backup power.

Lighting Schemes:

For typical indoor spaces, such as exam rooms, offices and conference rooms, surface or pendant mounted direct/indirect luminaires with T8 fluorescent bulbs are used quite often.  The majority of other indoor spaces use fluorescent or compact fluorescent bulbs in a range of different types of fixtures.  For the ground floor lobby adjacent to the façade of the Bellevue Medical Center, natural daylight comes in from the glass panel roof and curtain wall façade.  As natural daylight fades, occupant and daylight sensors in the main lobby control light levels of field staggered high output T5 fluorescent bulbs along the underside of atrium balconies for each floor.  In addition to fluorescent bulb control, metal halide spotlights above the 4th floor balcony and along the older Medical Center façade at a higher elevation point towards honeycomb reflectors to distribute light down to the lobby as designed.

Structural Systems:

The general structural system consists of steel columns, beams and girders with steel composite decking under normal one-way reinforced flat slabs using 4000 psi normal weight concrete for the ground floor and 3000 psi light weight concrete for floors above.  The ground floor has a 6” slab on grade above a 2” layer of sand and 6” layer of crushed stone, while other ground floor slab areas above basement space uses 10” flat slab with drop panels.  The minimum FY’50 steel beam size is W12”x16.  Typical flat slab reinforcements have #7 rebar @ 16”EW spacing and #6 rebar @ 14”NW spacing.  The building foundation includes steel columns encased in 6000 psi normal weight concrete based with 10’x10’ spread footings.  Besides for the structural basics, connecting the new Ambulatory Care Pavilion to the older medical building posed a seismic design challenge.  The two structures likely sway back and forth at different rates during earthquake or other seismic events.  Skylight trusses, a major component that connects the old and new structures, hold up the glass panel roof above the main lobby.  In order to assure structural stability, structural arms with smooth, flat upper surfaces and Teflon covered lower surfaces stick out past the façade of the older building to allow the skylight trusses to slide along these arms in the event of an earthquake.

Construction:

The Bellevue Ambulatory Care Pavilion underwent a design-bid-build delivery method.   Construction began in May 2003 and ended in February 2005.

Fire Protection Systems:

The construction type of the Ambulatory Care Pavilion falls under “Type-1B” construction.  The building utilizes a dry pipe sprinkler system with two 7,763 gallon compartment gravity fire reserve tanks.  All areas with finished ceilings have concealed sprinkler heads while areas with no ceilings have upright sprinkler heads with chrome plated finishes.  The vast open indoor space of the main lobby called for a smoke purge system in excess of 300,000 CFM.  In the event of smoke buildup, return air dampers close while smoke dampers open and makeup air is introduced at floor level at a low velocity to displace smoke towards three 106,000 CFM smoke exhaust fans near the higher elevated skylight trusses.

Transportation/Circulation:

An elevator lobby provides six passenger elevators from the ground floor to the 4th floor at the north end of the building.  Two fire rated stair cases at the north end of the building and one at the south end allow egress for occupants on all floors.  The main entrance has 3 revolving doors and 2 double swing doors at the west end along 1st Avenue.  The ground floor has eight fire rated exit doors placed around the footprint of the building.

 

 

 

 

 

 

The Capstone Project Electronic Portfolio (CPEP) is a web-based project and information center. It contains material produced for a year-long senior thesis class. Its purpose, in addition to providing central storage of individual assignments, is to foster communication and collaboration between student, faculty consultant, course instructors, and industry consultants. This website is dedicated to the research and analysis conducted via guidelines provided by the department of architectural engineering. For an explantion of this capstone design course and its requirements, click here.

Note: While great efforts have been taken to provide accurate and complete information on the pages of cpep, please be aware that the information contained herewith is considered a work-in-progress for this thesis project. Modifications and changes related to the original building designs and construction methodologies for this senior thesis project are solely the interpretation of David Sivin. Changes and discrepancies in no way imply that the original design contained errors or was flawed. Differing assumptions, code references, requirements, and methodologies have been incorporated into this thesis project; therefore, investigation results may vary from the original design. This page was last updated on 11/26/08.