Sustainable/LEED

Atlantic Plumbing, 8th and V Streets, NW

The former Atlantic Plumbing site, located along 8th and V Streets near Florida Avenue, NW, includes three separate parcels A, B and C.  SK&A provided structural engineering services for the development of Parcels A and B which include two new, luxury, urban high-design residential buildings with ground-level retail spaces and underground parking for 190 cars.  Parcel C, which is currently under design, includes a nine-story hotel and a 10-story residential building connected together by a bridge spanning W Street, NW.  

The first building at 2112 8th Street, NW (Parcel A) is a 10-story, cast-in-place concrete building with 339 units and two levels of below-grade parking.  Building amenities include a rooftop pool, bar, kitchenettes, movie screening area, vegetable garden plots, a business center, communal lounge area with theater, a fitness center, and bicycle storage rooms.  To give the building an edgy, industrial look, the exterior exo-skeleton frame of the building is comprised of Corten weathering steel.  The design and detail of the steel frame exo-skeleton is designed to resist both lateral and thermal loads.

2030 8th Street, NW (Parcel B) includes a second building with six stories and 71 condominium units.  This smaller building is a cast-in-place concrete structure with one level of below-grade parking.  The building features 10’ ceilings, rooftop terraces, a business center, as well as fitness and bicycle storage rooms.

In addition to traditional retail, the project includes 1,500 sf of artist studios occupied by the Washington Project for the Arts as well as a 10,000 sf Landmark movie theater.

L’Enfant Plaza East & West Retail Renovations

Located in Washington, DC’s southwest quadrant across from the National Mall and Smithsonian Museums, L’Enfant Plaza is a massive mixed-use, commercial complex of multiple mid-century buildings originally constructed in the 1960’s.  The complex features office/commercial and governmental buildings, a hotel, an underground shopping mall and parking, as well as a major subway station.  The overall complex has been undergoing an extensive renovation and redesign, including the redevelopment of the retail mall as well as the existing L’Enfant Plaza hotel and an office building.  A new 600,000 sf office building will also be constructed in the center of the plaza. 

The retail renovation projects included modernization of the existing underground retail mall, the development of a new glass atrium providing access to the underground retail corridor, and structural strengthening at the promenade and plaza levels to accommodate the future nine-story office building.  The strengthening work for the office building was conducted concurrently with the retail renovation to allow retail operations to continue uninterrupted during construction.

For the strengthening portion of the project, a cost-effective demolition concept was devised involving almost no re-shoring of the existing slab.  New concrete framing was constructed over an existing auditorium occupied by the National Transportation Safety Board (NTSB).  To construct the framing, SK&A assisted the contractor in developing a steel formwork system using new and existing columns for support.  A grid of compression beams was also designed to support the plaza layout and future office building concept.  

The large glass atrium portion of the project is composed of a series of steel moment frames.  Slip-critical bolts at the column-to-beam connection were used to accommodate the contractor’s preference for steel erection.  Additionally, the east stair spans between the promenade and plaza levels, with no posts beneath the landings.

The East and West portions of the renovation were designed and constructed as two separate projects.  The West project received an SEA-MW award in the $15-40 Million Renovation category in February 2015. 

600 Massachusetts Avenue, NW

Located adjacent to the Washington Convention Center and close to Chinatown, SK&A recently completed structural design services for this new 12-story, concrete-framed Class “A” commercial office building.  Currently under construction, the structure includes 401,000 gsf of above-grade space, plus an additional 44,000 gsf of space on a below-grade concourse.  Parking is provided on three below-grade levels and totals approximately 132,500 gsf.  The project also required the relocation and restoration of two historic townhouses as additional office space. 

The building’s exterior facade incorporates natural stone, brick, and metal paneling along the glass curtain wall system.  Perimeter columns are spaced 30 feet apart for maximum openness and space.  Additional features include a light-filled lobby with stone flooring, wood and stone walls, and a water feature; floor plates with slab-to-slab heights of at least 11 feet; private balconies on five floors; and a rooftop terrace with an outdoor conference area.

Founder's Square Office Building (675 Randolph Street)

This 13-story, 353,000 sf Class "A" office building is occupied by the Federal Government’s Defense Advanced Research Projects Agency (DARPA) in Arlington, VA.  The building is located within the larger Founder’s Square complex, which is a 5.35-acre, mixed-use development with two office buildings, a residential tower with retail, and structured below-grade parking.  The development is certified at the Gold level under the LEED-ND (Neighborhood Development) pilot program.

Designed to meet the Department of Defense minimum Anti-Terrorism Force Protection (ATFP) standards, the building has an 82-foot secured perimeter and is surrounded by a sizeable lawn separating it from the surrounding buildings within the complex.

Southern Regional TechRec Complex

Located in Prince George’s County, MD, the Southern Regional TechRec Complex is a state-of-the-art, multigenerational community facility providing a broad range of recreational and technology resources.  The facility’s features include: a double court gymnasium with suspended running track, a large multi-purpose room, fitness rooms, a climbing wall, classrooms, group exercise areas, a kitchen, a professional recording studio, a dance studio, soccer and multi-purpose fields, and parking spaces for 200 cars.  The building also includes a vegetative green roof, cafe and lounge areas, computer and science labs, and an open viewing gallery.

The highlight of the facility’s façade is an expansive multi-colored glass curtain wall system, running the length of the building.  Additional design elements include perforated metal paneling within the exterior façade and a curving steel stairway leading to the mezzanine viewing area.  The building’s design has received multiple awards, including “Public Building of the Year” from the American Institute of Architects’s (AIA)/Maryland, a “Gold Award for Architectural Excellence” from AIA/Potomac Valley and a “Detail Award in Architecture” from AIA/DC.

Brookland Middle School

Replacing the existing outdated and shuttered school, the new Brookland Middle School provides a 21st century learning environment for 540 students.  The facility includes a three-story academic wing, a full-court gymnasium, black box-type performance hall, outdoor learning space above the gymnasium, media center, and administrative support spaces. 

In order to accommodate the project’s aggressive schedule, structural documents were released well in advance of other disciplines, to permit early engagement and the mobilization of structural trades, which allowed the contractor to meet the project deadline.  The project is also slated for LEED Gold certification.

Capitol Plaza Green Roof Addition

SK&A’s Repair & Restoration Division evaluated the adequacy of an 11-story office building’s roof structure to accommodate a green roof retrofit.  Built atop of a two-level parking garage, the building is approximately 153,344 SF including plazas, while the new green roofs account for 11,000 SF.  Structural evaluation included providing detailed structural analytical computations to evaluate the roof’s capability of supporting the green roof addition plus required service loading, such as snow load, live load and snow drifts. Additionally, certain areas of the main roof and penthouse roof frame were evaluated to receive solar equipment. SK&A determined that the roofs were adequately designed to support the anticipated loads from the green vegetative roofing assembly in addition to the multiple load combination. 

SK&A categorized the scope of work needed for the green roof addition and provided roof plan view drawings for initial cost estimates. Following the survey, SK&A prepared plans and specifications for inclusion in the application package for DDOE’s Green Roof Rebate for Targeted Large Retrofit Program, designed and specified the green vegetative roofing system, provided structural waterproofing details to integrate the system application with those of the manufacturer standard details and prepared selective demolition and removal of the existing roofing assembly only to the extent to accommodate the new application.

JBG Headquarters Stairs

The central staircase at JBG's Headquarters in Chevy Chase, MD serves as the main focal point of the space.  The iconic three story “floating” staircase is constructed of steel stringers and painted with a high gloss with a luminous auto body finish.  Other features include glass treads, landings, and guardrails supported by a one-inch center rod attached to the slab above with minimal diagonal bracing.  In addition, the installation of the stair took over 2,000 night hours to complete and has over 800 machined parts and 1,000 screws.

Awarded a LEED Platinum Commercial Interiors (CI) rating in 2013, the project also received the Award of Merit for Best Interiors Professional Services/Institutional Tenant Space over 25,000 sf from NAIOP Maryland/DC and the floating stair received the Star Award for Visual Excellence from the Washington Building Congress (WBC) in 2013.  In 2014, the floating stair also received an Outstanding Project Award in the Specialized Structural Elements category from the Structural Engineers Association of Metropolitan Washington (SEA-MW).

The Corporate Office Centre at Tysons II

This massive, mixed-use complex encompasses 5.9 million square feet of commercial, residential, and retail construction in 10 high-rise buildings with structured parking for 12,000 cars. The privately-developed project accesses the Tysons Corner Metro-rail station via an elevated pedestrian bridge. Specific buildings within the development’s larger master plan include:

  • Tysons II Office Building F, PricewaterhouseCoopers Offices: Located at 1800 Tysons Boulevard, this world-class 320,000 sf, 15-story office tower was awarded the NAIOP 2005 Award of Merit for Best High-Rise Building.  The tower is dramatically elevated on five foot deep cantilever girders, supported on stainless steel bearings atop elongated columns.  Other dramatic structural features include a 36-foot long cantilevered restaurant that "floats" above the landscaped courtyard below, as well as folded concrete plate features at the roof and lower canopy levels.  A separate 275,000 sf, nine-story pre-cast concrete parking structure for 840 cars connects to Building E’s existing parking structure via elevated bridges.
  • Tysons II Office Building H: The latest installation for the Corporate Office Centre is a 17-story, 476,000 sf office building eaturing a two-story, light-filled lobby and retail center with an iconic staircase and dramatic water feature, as well as other amenities, such as a conference center, fitness center, and café. The building’s 15 floors of office space sit above the two-story glass-enclosed lobby and retail center.  The third floor, directly above the podium, is cut back to the inner column line creating a strong reveal in the building’s form and providing a large external terrace for tenants.  The scheme also incorporates a pre-cast concrete garage on 11-levels for 1,185 cars as well as a 450-foot long enclosed pedestrian sky bridge that skewers through the building lobby and connects an existing parking garage across Tysons Boulevard to the new parking structure.

HHS at Parklawn, 5600 Fishers Lane

Renovation of the Department of Health and Human Services’ (HHS) Parklawn Building to upgrade the facility into a Class “A”, LEED Platinum-certified office building with industrial loft aesthetics and innovative green features.  

Structural modifications included a 12-story vertical expansion to create a new atrium space.  The new atrium feature consists of a new floor at the main building level, along with new elevator and stair cores situated at the atrium corners, serving each level above the atrium floor.  The atrium is enclosed by a new steel-framed roof with 100-foot spans supporting a 100x100-foot ETFE skylight system.  Four existing elevator cores were demolished, removing off-grid columns that required new slabs as well as column jackets at the affected column bays.

Additional modifications included floor penetrations at existing slabs for new elevator and mechanical shafts, in-fill of existing abandoned shafts, FRP retrofits for the new facade and two-story lobby, and blast hardening at columns and slabs. 

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