201 Extended Stay Suites
Chantilly, VA
David A. Klein
Structural Option
Master of Architectural Engineering Candidate
Advisor: Professor Thomas Boothby, Ph.D., P.E., R.A.
Introduction
201 Extended Stay Suites is a hotel is located in Chantilly, VA along a major highway. It features nine stories of lobby, hotel, and office space along with two additional levels of parking. The hotel levels include 182 extended stay guest rooms, pool deck, fitness center, and two raised outdoor terrace spaces. At the start of construction, the design was aimed at achieving a LEED Gold certification.
201 Extended Stay Suites includes multiple distinguishable architectural features. An elevated pool platform exists on the second level above grade along with the building’s main lobby. The North elevation of the building (opposite the highway) includes a large porte cochere for luggage drop-off as shown below:
The two structures on either end of the roof are known as “feature end towers.” These towers add to the building’s architecture as well as allow for covered mechanical room spaces in addition to the penthouse level pictured in the rendering below.
Three major façade materials are used on all elevations of the building. Sante Fe brick makes up a majority of the wall surface area while a stone like material produced by the manufacturer, Arriscraft, is used for ledges and trim throughout the façade and rooftop. Glass fiber reinforced concrete panels (grey in color) are used under windows.
Facade Materials
Building Features
Landscape
Because of the limited above ground space adjacent to the building, vehicle parking will mainly occur the below grade / partially below grade parking levels. The architect takes advantage of the sloping topography for this purpose, as shown below.
Building Enclosure
The façade of the superstructure incorporates two main wall assemblies as shown below:
Wall detail 5 shows an exterior wall assembly that consists of exterior 7 5/8”brick, 5/8”fiberglass sheathing, 1 ½”rigid insulation, 6”batt insulation, and 5/8”gypsum wall board on the interior. A similar wall build-up is shown on wall assembly 8 in that it differs only in the exterior most material. Detail 8 shows a generic metal panel for the exterior wall surface such that multiple materials of this type may specified on a separate drawing. Both exterior wall assemblies provide similar R-values and Sound ratings (STC).
The main roofing system consist of a hot fluid rubberized asphalt substrate with rigid insulation topped with ballasted by white gravel acts as the roofing system for smaller portions of roof area. with adhered mineral and fiber boards that are 24” by 48”to 48” by 96”in one or two layers. The insulation of the main roof is polyisocyanurate foamed plastic insulation boards
The building was projected to achieve LEED Gold certification at the start of construction
Electrical:
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All materials used for this project have a VOC below the required limits provided in LEED 2.2
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Energy efficiencies, noise level, vibration, power density, and other electrical parameters are in accordance with ASHRAE 90.1, 2010 standards at minimum
Mechanical:
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All refrigerant used in this project is R-410A
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All urinals are to be water less units; all water closets in public areas are low consumption (1.28 GPF)
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Energy efficiencies of equipment comply with ASHRAE 90.1, 2007 standards at minimum
Sustainability
Structure
A majority of the superstructure consists of a 2-way, 8-inch, conventionally reinforced, flat plate normal weight concrete slabs that provide a 2-hour fire separation between building levels. Instances of post-tensioning tendons exists throughout the buildings slabs for use in nontypically large spans. The foundation, on which the columns of the superstructure rest, consists of spread footings. Lateral loads are resisted by a combination of concrete moment resisting frames and concrete shear walls.
Building Systems
Mechanical
The building’s HVAC system consists of a series of air handling units (AHUs) that directly supply air to lobby spaces as well as indirectly to individual guest rooms through in-unit fan coil units (FCUs). AHU 13 and 14 supply outside air to guest rooms and corridors respectively. FCUs provide between 400 and 600 cfm of supply air to guest rooms including 100 to 150 cfm of outside air. Two roof-top 300 nominal ton air cooled chillers along with three rooftop gas fired high efficiency 3000 MBH boilers handle the necessary chilled and hot supply and return water to the various AHUs.
Structure
A majority of the superstructure consists of a 2-way, 8-inch, conventionally reinforced, flat plate normal weight concrete slabs that provide a 2-hour fire separation between building levels. Instances of post-tensioning tendons exists throughout the buildings slabs for use in nontypically large spans. The foundation, on which the columns of the superstructure rest, consists of spread footings. Lateral loads are resisted by a combination of concrete moment resisting frames and concrete shear walls.
Lighting
A majority of the building’s lighting is supplied by 208/120 voltage and consists of a combination of fluorescent tube and compact fluorescent lamps. Incandescent luminaires are featured in the meeting room (Lobby level) for decorative lighting purposes. High intensity discharge (HID) lamps are featured in elevator pits.
Electrical
From the utility company, the building is supplied with 4000 amps at 208/120-volt 3 phase power. The main switch board is capable of providing both 208/120 volt and 480/277-volt 3 phase power. The building is equipped with a diesel generator that able to supply 800 amps to the emergency switchboard that operates at 208/120 volts. Each typical guest room is designed for a lighting load of 1200 VA and a total load, including HVAC, of 16.4 kVA at an ampacity of 78.87 amps. The main switchboard provides 200 amps to both the pool and kitchen panels, 225 amps to the Lobby lighting panel, and 600 amps to the Lobby HVAC panel.
Telecommunication and Fire Alarm Systems
The Hotel is equipped with a card reader system for guest room entry (1” minimum conduit required). All HVAC unit is provided with duct mounted smoke detectors at supply and return outlets and intakes. The building features a wet sprinkler system in accordance with NFPA-13. All sprinkler heads in guest rooms are of the concealed type. Pendant sprinkler heads are existent in non-guestroom areas.
