Text Box: HD Woodson Senior High School
5500 EADS Street NE, Washington, DC
NEAL DIEHL-Construction Option
Text Box: Final Report
Text Box: Reflection
Text Box: 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 Neal Diehl.  Changes and discrepancies, code references, requirements, and methodologies have been incorporated into this thesis project; therefore, investigation results may vary from the original design.
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Text Box: Architectural Engineering
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The Design-Build Contractor/Construction Management Company for HD Woodson High school is HESS Construction + Engineering Services.  The lead architectural firm is cox graae + spack.  HD Woodson Senior High School will be striving to achieve LEED Gold Certification upon completion under the LEED for Schools program by the US Green Building Council.  Green Roof technology and highly reflective EPDM roofing membrane will assist in achieving critical LEED Points.  The occupancy is E for educational and Construction is classified as Type 2A and 2B and a maximum of 4 stories in select areas.  A combination of steel columns, beams, bar joists with composite metal deck with concrete floors and masonry bearing walls for the base building.  Exterior walls will be masonry or metal stud cavity-wall construction.  With the exception of the 55th street front of the site an eight foot black metal picket fence will be installed on entire perimeter.   

Structural System Description

Structurally the HD Woodson High School will primarily be using an ordinary structural steel design.  Structural masonry walls are used to carry lateral loads along with concentrically braced frames.  The roof framing is open web steel joists with a 1 ½” metal decking.  Floor system will use Steel beams and columns as part of a composite slab system.  The floor system will use structural steel beams and columns as part of a composite system.  The roof framing will be open web steel joists and 1 ½” metal decking.  Concentrically braced frames are used to carry additional lateral loads not accounted for by structural masonry walls.  Typical columns range from W10x33 to W10x88 and W12x79 to W12x152. Typical beams are W8x10, W16x26 and W16x31.

Mechanical System Description

The main Mechanical room will be located on the Ground Floor of the building.  In this space there will be two dual centrifugal chillers that will be connect to an outdoor cooling tower and the main Dedicated Outdoor Air Systems Unit and two Air Handling Units.  The lower level will also have a separate mechanical room dedicated to the pool and its dedicated dehumidification unit.  Other areas of the building are feed by AHU’s and DOAS Units on all floors and multiple Roof Top Units.  As a whole the system is water to air system in conjunction with a Dedicated Outdoor Air System.  These main units located in dedicated Mechanical/Electrical Rooms thought the building supply hot water from five parallel boilers and chilled water to multiple VAV boxes, typically located in the ceiling plenum.        

Electrical System Description

Two switchboards will be used to supply power to the building at 3000A 480/277V 3PH 4W.  Multiple step-down transformers are located on all floors to meet 208/120V loads.  The 120/208V panels are mostly dedicated for dedicated receptacles for computers.  Lighting loads will be supplied by 277V throughout.  Computer labs will utilize direct/indirect light fixtures or four foot recessed fixtures, like most spaces with dropped ceilings.  Compact fluorescent down light fixtures will accent spaces of interest and common areas.  Classroom spaces shall have fluorescent fixtures with electronic ballasts and bi-level switching.  Occupancy sensors will be installed in instructional spaces and classrooms along with the use of day lighting principals.  A 300kW, 277/480V 3PH 4W emergency generator, diesel-powered, will be connected to all emergency lighting, tele/data systems and other critical equipment.

Plumbing System Description

A peak load of 269 gallons per minute at 110 pounds per square inch will be satisfied with a four inch domestic water supply and duplex booster pump.  Copper piping has been specified as the material of choice for domestic piping.  Hot water heaters will be gas, and heat water to 140 degrees F, where required a booster heater will be used to heat water to 180 degrees F.  The natatorium will have a separate means of heating water using gas and located in the pool mechanical room.  Sanitary piping will use a sewage lift station located on the lower levels where gravity discharge is not possible.  Storm water drainage from roof areas will drain to storm water infrastructure in the street.  Some roof areas will flow to rain gardens to supplement irrigation with non-potable rain water.

Fire Suppression System Description

A Class I standpipe system will be required throughout the building.  Standard ½” quick-response sprinkler heads will be utilized.  The six inch fire suppression water supply shall be assisted with a NFPA and local code approved fire pump.  Exit stairs will have 2 ½” valve connections.  All areas will have sprinkler heads rated at 135 degrees F, with the exception of areas required to be higher by code.