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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 Gea Johnson. Changes and discrepancies in no way imply that the original design contained errors or was flawed. Differing assumptions, code references, requirements, and methodologies have been incorporated into this thesis project; therefore, investigation results may vary from the original design.
This page was last Updated on 01/13/2012 by Gea Johnson and is hosted by the AE Department © 2012

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1000 CONNECTICUT AVENUE, NW OFFICE BUILDING
WASHINGTON DC
	GEA JOHNSON   STRUCTURAL OPTION

Thesis Proposal

 

 

 

Structural Depth:

 

The structural depth of this thesis will include re-locating 1000 Connecticut Avenue Office Building to Arlington,VA and re-designing the existing two-way flat slab system as a steel frame system with wider bays and higher floor-to-ceiling heights. Since Washington DC has a zoning height limit of 130 ft, the new structural system will need to be designed as 11 stories to stay within the height limit. To design the new structural system as 12 stories the office building will need to be re-located to an area that does not have a height limit, as a result the building will be re-located to Arlington, VA. The new structural system will use a composite beam/girder gravity floor system and a combination of moment and braced frames for the lateral system. The goal of this redesign is to reduce the overall building cost; reduce the construction schedule; increase bay widths and floor-to-ceiling heights; and increase the existing building revenue.

 

Breadth Study 1- Construction Management

 

The structural system re-design will impact the total building cost, construction schedule, and construction site management. In addition, the building LEED certification may be impacted due to changing the structural system material. First, the cost estimate for the existing system will be compared to the new structural system cost estimate. Second, the construction schedule for the new structural system will be compared to the existing system construction schedule. The construction schedule for the new system will include creating/ checking new critical paths. Third, how the existing construction site will have to be managed for steel versus concrete will be analyzed. Fourth, the LEED certification for the new structural system will be compared to the existing building LEED certification. Lastly, since the new structural system will be designed with wider bays and higher floor-to-ceiling heights, the rent charged for the space will increase thus increasing the building's annual revenue. Therefore, the revenue obtained from the new structural system layout will be compared to revenue obtained from the existing structural system layout to determine which system generates more revenue.

 

Revised Breadth Study 2- Acoustics and Lighting

Since the structural system will be re-designed as a steel framing system an acoustics breadth will be conducted by determining the sound transmission class (STC) and noise reduction (NR) values for both the existing two-way flat slab system and the proposed composite beam/girder gravity system. In addition, since the new structural system will be designed for high floor-to-ceiling heights, the existing lighting system's illuminance applied on the work plane surfaces in the new space will be affected. As a result, a lighting breadth will be conducted by checking the existing lighting system's illuminance and comparing this value to the space's target illuminance. If the existing lighting system's illuminance is not within +/- 10 percent of the target illuminance, the lighting system for a typical office space will be re-designed with new lighting fixtures. The new space with high floor-to-ceiling heights and new lighting will be represented through renderings.

 

Note: The original architecture breadth 2 study was replaced with acoustics and lighting on 01/13/2012

 

MAE Course Related Study

 

For re-designing the structural system, information obtained from two graduate level courses will be used. Computer modeling techniques learned in AE 597A (computer modeling) will be incorporated by using ETABS and SAP 2000 to design and analyze the new structural system. Coursework from AE 534 (Steel Connections) will be used to design typical beam-to-column shear and moment connections and eccentric braced frame connections.

 

To view the original and revised thesis proposals, click on the images to the right.