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

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

3. 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
John M Sekel

4. 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
John M Sekel

5. Existing Building Structural Composite beam and slab construction
50 ksi wide flange shapes
30’x25’ 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
John M Sekel

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

7. Existing Building Mechanical Lighting/Electrical
VAV boxes with electric duct heaters and reheat coils with VFD
2 – 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 kW emergency generator
2’x4’ Lightolier 277 volt florescent fixtures
Structural Option
John M Sekel

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

9. 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
John M Sekel

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

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

12. Structural depth Framing re-design
New bay size outside of core 30’x50’
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
John M Sekel

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

14. Structural Depth New member sizes Girders Beams Structural Option
Original: W18x35
New design: W24x62
Beams
Original: W14x22
New design: W24x55
Structural Option
John M Sekel

15. Architectural Breadth
Structural Option
John M Sekel

16. Construction Breadth
Structural Option
John M Sekel

17. Conclusions
Structural Option
John M Sekel

18. Thank You
Structural Option
John M Sekel

19. Questions?
Structural Option
John M Sekel