| Building Name: |
Maryland General Hospital |
| Location: |
Baltimore MD |
| Occupancy: |
Health Care Facility |
| Size: |
96, 534 square feet |
| Height: |
6 stories with an average building height of 85' 6"
Courtyard Infill:
6 story infill with penthouse + 1 basement level
Vertical Expansion:
4 additional stories on top of existing 2 story building |
| Construction Dates: |
January 2008 - January 20010
Phased Completion:
3rd Floor Pharmacy Substantial Completion: January 29th 2009
Phase 1 Substantial Completion: January 29th 2010
Phase 2 (if approved): Substaintial Completion January 29th 2010 |
| Cost: |
| Overall Project Cost: $57 million |
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Building Cost: $33.1 million |
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Phase 1: $28.8 million |
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Phase 2 (if approved): $4.3 million |
NOTE: Overall project cost includes design and engineering fees and owner supplied meddical equipment |
| Project Delivery Method: |
Traditional Design-Bid-Build
Barton Malow Company acts as the CM at risk under a lump sum contract to the University of Maryland Medical Systems |
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Architecture
The Central Care Expansion is the latest of several additions to the two block long Maryland General Hospital in the past 50 years. The hospital is located in the northwest portion of the city of Baltimore, just outside the inner harbor.
The expansion will house a new pharmacy, an operating department with per-operative rooms and eight new operating rooms, an 18-bed intensive care unit, two GI suites, a laboratory, and room for future expansion.
The addition will infill an existing courtyard six stories and continue across a portion of the existing two story hospital, maintaining a total of six stories (including the existing two stories). As the building rises, it steps back slightly from the existing building to create areaways to allow natural daylight into existing patient rooms and to accommodate the sixth floor penthouse.
The project is broken into two phases. The first phase includes all of the structural steel for the addition and complete enclosure and fit-out of the third floor above the existing building, and the fourth through sixth floors. The second phase includes the enclosure and fit-out of the basement through the third floor in the courtyard infill.
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Building Envelope
The exterior façade of the building consists of several different systems which complement the architecture of the existing buildings. The west façade on the first through third floor, which will be installed during the phase 2 fit-out, is strictly curtainwall between the brick walls of the existing building surrounding the courtyard. The façade for the third through fifth floors consists of a field brick and stone masonry cavity wall on cold formed metal stud backup with curtainwall at the stairwell and ribbon windows on the north and west faces of the building and punch windows on less visible east façade. Finally, the sixth floor penthouse utilizes insulated metal panels on metal stud back up with gypsum board and an acoustical plaster on the interior to assist with acoustical concerns.
The hospital roof consists of several different variations of a modified bituminous roof system. Where the building steps back on the fifth floor to create two areaways the system consists of a glass mat substrate board on metal deck with tapered polyiso insulation, and several layers of bituminous sheet membrane. On the sixth floor where the penthouse steps back from the rest of the building the system is similar to that on the fifth floor however the roof structure is concrete on metal deck and utilizes insulated pavers to protect the roof as there is access to if from the mechanical room. Finally, the roof of the penthouse utilizes a glass substrate board on a structurally sloped metal deck with polyiso insulation and several layers of bituminous sheet membrane.
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Major Codes
2000 International Building Code (IBC)
All applicable National Fire Protection Association (NFPA) Standards
-Including NFPA 99 for Medical Gas Systems
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Zoning
B-5-1: Central Commercial District
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Building Systems Summary |
Construction
Maryland General Hospital is located on two blocks between Linden Ave and Howard Street in downtown Baltimore. The project has temporarily taken two existing parking lanes in order to shift traffic and provide space for the crane, scaffolding, laydown and shakeout. Construction on the project began in January 2008 with a scheduled completion for both phases in late January 2010.
This project includes a substantial amount of selective demolition and renovation work to prepare the existing columns to accept the load of the new columns, to reconfigure rooms in several departments of the existing hospital to maintain daylighting requirements for patient rooms (since the addition blocks in numerous windows), and to make hallway and room connections to the existing building. As such, there Infection Control Risk Assessment (ICRA) precautions were a major component of the project.
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Structural
The structural system for Maryland General Hospital is a structural steel system. Wide flange columns and beams support the composite flooring system at each level for gravity loads and several braced frames provide support for lateral loads. Column sizes range from W10x33 to W14x61 and span one to three stories. The typical beam size for the operating floor is a W16x31 into a W18x35 or W18x55 girder while the typical beam size for the per-operative floor is a W12x26 into a W12x45 girder. Each of these beams and girders will receive shear studs to allow for 3 1/4” 3000 psi composite slab on metal deck for each floor. Four braced frames constructed from HSS 8x8x5/16 spanning six stories (some through the existing two story building) will provide lateral support for the addition.
To prepare the existing structure for this addition many of the existing columns had to be reinforced with steel plates on either the flange or the web of the column. The most common of these was a ½” x 12” plate welded to the flanges of the column. Additionally, nine of the existing columns had column extensions welded to the top to accept the new columns.
Structural Design Codes:
- 2000 International Building Code
- Load calculations per ASCE 7
- Concrete Design in accordance with ACI 318-02
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Mechanical
The project will utilize a Variable Air Volume (VAV) System supplied by two new 380 ton air handling units to condition the new spaces. Two replacement 650 ton, 1950GPM cooling towers and two replacement 650 ton, 1293 GPM chillers were installed on the roof of the existing seven story building to handle existing and new heating and cooling loads for the building.
Mechanical Design Codes:
- Medical Gas in accordance with NFPA 99
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Fire Protection
The addition will utilize a wet type automatic sprinkler protection system which will be tied into the existing hospital’s existing system. The system will be supplied from the municipal water source and an existing electric booster pump.
Fire Protection Design Codes:
- NFPA 13, Instillation of Sprinkler Systems 2007 Edition
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Electrical
A 2000A 480/277 Volt 3-phase electrical service will be provided to the addition from an existing unit substation in the hospital. A new 500kVA 480Y/277V emergency generator will back up this supply in the event of an outage.
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Lighting
The hospital will utilize typical 2'x2' and 2'x4' parabolic lights with T8 florescent bulbs for general lighting throughout the hospital. Recessed downlights with compact florescent bulbs will be utilized where additional lighting is required in the operating rooms and pre-operative rooms.
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Transportation
For phase one the elevator will only service the fourth through the sixth floor. To accommodate this a suspended elevator pit will be utilized so that the elevator can become operational prior to the completion of phase two.
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