User 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 Joseph W. Wilcher III. Changes and discrepancies in no way imply that the original design contained errors or was flawed. Differing assumptions, code references, and methodologies have been incorporated into this thesis project; therefore, investigation results may vary from the original design." |
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| Building Name: |
Union Station |
| Location & Site: |
Block 720 along H Street
Washington D.C. |
| Building Occupant Name: |
Union Station Corporation |
| Function Types: |
Mix Use |
| Size: |
329,000 Square Feet [Of Expansion] |
| Number of Stories: |
5 Stories Above Grade |
| Height: |
88’ – 2” |
| Construction Dates: |
April 2005 – August 2006 |
| Cost: |
$23 Million [Total Cost of Expansion] |
| Project Delivery Method: |
Design-Bid-Build |
| Owner: |
Union Station Redevelopment Corporation |
Web Page Not Available |
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10 G Street, N.E., Suite 504 |
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Washington DC 20002 |
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| Prime Architect: |
Timothy Haahs & Associates |
http://www.timhaahs.com/ |
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550 Township Line Road, Suite 100 |
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Blue Bell PA 19422 |
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| Associate Architect: |
RTKL Associates Inc. |
http://www.rtkl.com/ |
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1250 connecticut Avenue, N.W. |
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Washington DC 20036 |
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| Structural Engineer: |
Timothy Haahs & Associates |
http://www.timhaahs.com/ |
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550 Township Line Road, Suite 100 |
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Blue Bell PA 19422 |
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| Civil Engineer: |
Schnabel Engineering |
http://www.schnabel-eng.com/ |
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510 E. Gay Street, Suite 206 |
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Wesy Chester PA 19380 |
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| MEP Engineer: |
RTKL Associates Inc. |
http://www.rtkl.com/ |
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1250 connecticut Avenue, N.W. |
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Washington DC 20036 |
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| General Contractor: |
Clark Construction |
http://www.clarkconstruction.com/ |
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7500 Old Georgetown Road |
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Bethesda, Maryland 20814 |
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The expansion of Union Station is a 5-story building with mixed use located along H Street in Washington DC. Union Station is Amtrak’s third busiest station in the United States. In addition to accommodating Amtrak trains, it also serves as a hub for Maryland’s commuter rail service (MARC), Washington’s Metro Rail system, taxis and intercity buses. The expansion also features office space, a new security area, and parking as well.
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Zoning |
The Union Station Expansion is located approximately 1.5 miles from the United States Capitol located along H-Street. The zoning of the site is C-M-3 (High Bulk Commercial & Light Manufacturingt) according to the Washington DC Zoning Commission. |
| Applicable Codes |
International Building Code 2000
DC Building Code Supplement 2000
DC Building Code 2003
DC Electric Code 2003
DC Mechanical Code 2003
DC Plumbing Code 2003
DC Fire Prevention Code 2003 |
| Building Envelope |
The building envelope for the expansion of Union Station varies on each wall as well as the roof. The East and North facades are expected to become obscured by future (planned) development in the region. Precast panels have been used as well as precast spandrels for the parking levels for each side.
Along the Northwest corner of the building, the architecture was focused greatly in this area. There is a “curtain” of perforated stainless steel panels, structural steel outrigger supports, and curtain wall glazing for the stair tower. In addition, there will be a large sign identifying the building and lighting fixtures will accentuate the architecture along this area.
The west façade is a unified elevation composed of the expansion and the existing building. Precast panels that match the existing façade will be added as well as perforated stainless steel panels. Also, since the railroad runs through Union Station, continuous horizontal elements are along the west façade creating the allusion of rails of a train track.
The south façade is where the existing and expansion tie into each other. The open areas were filled in with panels which match west façade.
The roof of the expansion consists of a parking level which is a 7” thick post tension concrete system where there is sufficient drainage.The usage of water proofing was used to prevent water from seeping into the concrete. This prevents from having to worry about future problems with the concrete slab. No mechanical areas are located on the roof because the mechanical space for the addition is located on the first floor. |
| Structural |
The typical floor system for the expansion to Union Station is a two-way post-tension cast-in-place concrete slab with a thickness of 7”. All the beams and girders are post-tension cast-in-place as well. Each beam spans a length of 63’-0” while the girders have a typical span of 24’-4”. For the upper levels, an average of 20 columns is located on each floor, which vary in size (15” x 15” to 28” x 40”) and all contribute in the lateral system. On the Ground Level, a 6 ½” concrete slab was used as well as a composite design located along the west elevation. The typical member size for the beams (in the composite section) is W27x84 which span 63’-0” and tie into a W33x118 girder. The foundation consists of spread footers which are either 6’ x 6’ or 12’ x 12’ (l x w).
The lateral system for the expansion to Union Station is composed of an ordinary reinforced concrete moment frame. It is important to note that the existing structure and the addition of Union Station do not share a lateral system. The existing structure to Union Station uses steel chevrons. The expansion sits on a separate column line from the existing structure and an expansion joint was placed between the structures.
The roof system of Union station is a 7” thick post-tension cast-in-place slab. The reason for this is the roof of the Union Station expansion has parking located on it. A total eight drains are located on the roof of Union Station. Waterproofing was used to protect not only the roof, but the other levels from any damaged that could take place. |
| Construction |
Construction for the expansion to Union Station started in April of 2005 and the building was completed in August of 2006. Design-Bid-Build was the type of construction delivery method used for the building. Since Union Station is located in one of the busiest areas of Washington DC, the construction took place around the clock. All the reinforced steel was placed during the day time and the cast-in-place concrete was poured around the time of 2 am in the morning. The reason for this was to not prevent major traffic problems when the concrete trucks traveled to the site. |
| Mechanical |
Union Station’s mechanical system is designed for multiple areas within the structure. For the new office spaces, elevator rooms, and electrical rooms, will be heated and cooled while the parking levels will not be heated in accordance with the applicable codes used. 1600 CFM air handling units were installed in the office spaces, security area, and mechanical/electrical room. |
| Lighting/Electrical |
Incoming power to the expansion of Union Station is provided from the existing portion, which receives power from H-Street. A brand new 3 phase, 4 wire, 480V generator was installed on the ground level. The expansion utilizes 10 different lighting fixtures ranging from 2x2 fluorescent ceiling mounted in the offices to ceiling mounted metal halide fixtures in the parking garage areas. |
| Fire Protection |
Union Station is equipped with automatic sprinklers on the track level, ground floor, mezzanine level, and all stair towers. For the parking levels, no sprinkler system is required as well as forced ventilation. |
| Transportation |
The expansion for Union Station uses the existing main entrance located off H-Street. Two new stair towers in the expansion are located along the North-West corner and on the East Elevation. A brand new elevator was also installed at the North-West corner for transportation to all levels. The expansion was utilizes the existing stair towers and elevator core from the original part of Union Station. |
| Telecommunications |
No information is available at this time. |
| Miscellaneous |
No special conditions or elements exist to report on. |
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