Acterna Headquarters Germantown Maryland John M Sekel EIT

Acterna Headquarters Germantown, Maryland John M Sekel, EIT The Pennsylvania State University Architectural Engineering 2003 Senior Thesis Presentation Structural Emphasis Structural Option John M Sekel

Presentation Overview • • Existing building Problem statement Proposal Structural re-design Construction considerations Architecture re-design Mechanical considerations Conclusions Structural Option 2 John M Sekel

Existing building • Project Team – – – Owner: Milestone Industrial, LLC. Architect: Hickok, Warner, Fox Architects Structural Engineer: Structural Design Group MEP Engineer: Girard Engineering General Contractor: L. F. Jennings Structural Option 3 John M Sekel

Existing Building • General – New corporate campus for Acterna Corporation – Site clearly visible off I-270 outside Washington, D. C. – Six story, 187, 500 sf office building – $10 million construction cost Structural Option 4 John M Sekel

Existing Building • Structural – Composite beam and slab construction – 50 ksi wide flange shapes – 30’x 25’ typical bays – 3 ¼” lightweight concrete slab on 2” metal decking – Spread footing foundations – First floor slab on grade – 2 – transfer girders over conference room on level 1 – 4 – braced frames for lateral stability Structural Option 5 John M Sekel

Existing Building • Typical framing plan Structural Option 6 John M Sekel

Existing Building • Mechanical – – VAV boxes with electric duct heaters and reheat coils with VFD 2 – 15000 cfm VAV A/C units per floor 2 – 350 ton cooling towers Plate and frame heat exchanger • Lighting/Electrical – 480/277 volt, 3 -phase, 4 wire system • 4000 amp primary switchboard • 2000 amp secondary switchboard • 2000 k. W emergency generator – 2’x 4’ Lightolier 277 volt florescent fixtures Structural Option 7 John M Sekel

Problem Statement • Column lines limit space usage • Design and construction can be coordinated better • Etc. Structural Option 8 John M Sekel

Proposal • Structural design criteria – – – Eliminate intermediate column line outside of core Long span steel from core to exterior “Stream-line” the structure Design for ease of construction Produce most efficient design Structural Option 9 John M Sekel

Proposal • Architectural design goals – Reflect structural changes in the façade – Open interior spaces, column free areas – Produce modern look ? ? Structural Option 10 John M Sekel

Proposal • Construction considerations – Reduce construction cost – Reduce construction schedule time – Integrate building design and construction • Mechanical considerations – Analyze impact of façade design on system Structural Option 11 John M Sekel

Structural depth • Framing re-design – New bay size outside of core 30’x 50’ – 50 ksi wide flange shapes • Most readily available – 3 ¼” lightweight concrete slab on 2” metal deck • 2 hour fire rating – Re-size frames for additional gravity load Structural Option 12 John M Sekel

Structural Depth • New framing plan Structural Option 13 John M Sekel

Structural Depth • New member sizes – Girders • Original: W 18 x 35 • New design: W 24 x 62 – Beams • Original: W 14 x 22 • New design: W 24 x 55 Structural Option 14 John M Sekel

Architectural Breadth Structural Option 15 John M Sekel

Construction Breadth Structural Option 16 John M Sekel

Conclusions Structural Option 17 John M Sekel

Thank You Structural Option 18 John M Sekel

Questions? Structural Option 19 John M Sekel