Neighboring an existing metro station, this 14 story building will become one the tallest of the modest skyline. The ground floor of the building has retail space available, giving it a slightly larger floor plan than the floors above.  In the upscale entrance of the building, stone floors, matched with high end stone and wood panels, are complimented by stainless steel elevator frames and doors. 


Floors 2-14 have fairly typical floor plans with only minor differences between them. Interior columns and a shear wall core give the building large amounts of open space. Within the core is the majority of the vertical transportation methods of the building, excluding perimeter staircases need for egress in the event of a fire.


A major architectural feature of the building façade is a curved glass curtain wall on the southern face of the building. The other elevations of the building are a mixture of precast architectural concrete and metal panels, ribbon windows and punched windows.

Major Modal Codes

ICC International Building Code, 2006

ICC International Mechanical Code, 2006

NFPA National Electric Code, 2002

International Energy Conservation Code, 2009

National Fire Protection Association, 2003

International Fuel Gas Code, 2006


B: Business

S-2: Parking

Sustainability Features

Multiple design considerations were made with goal of achieving LEED silver in mind.  Some of the main features worth highlighting are the alternative transportation methods, the water reuse/reduction techniques, the energy efficient mechanical system and the recycled environmentally friendly materials used during construction.  See below for the complete list of points that the design team feels are possible to achieve.

Sustainable Site: 9/14

· Site Selection

· Development Density & Community Connectivity

· Alternative transportation, Public Transportation Access

· Alternative transportation, Low-Emitting & Fuel-Efficient Vehicles

· Alternative transportation, Parking Capacity

· Site Development, Maximize Open Space

· Stormwater Design, Quality Control

· Heat Island Effect, Non-Roof

· Heat Island Effect, Roof


Water Efficiency: 3/5

· Water Efficient Landscaping, Reduce by 50%

· Water Use Reduction, 20% Reduction

· Water Use Reduction, 30% Reduction


Energy & Atmosphere: 3/17

· Optimize Energy Performance -10.5% New Buildings or 3.5% Existing Building Renovations

· Enhanced Refrigerant Management

· Measurement & Verification


Materials & resources: 5/13

· Construction Waste Management, Divert 50% from Disposal

· Construction Waste Management, Divert 75% from Disposal

· Recycled Content, 10% (post-consumer + ½ pre-consumer)

· Regional Materials, 10% Extracted, Processed & Manufactured Regional

· Regional Materials, 20% Extracted, Processed & Manufactured Regional


Indoor Environmental Quality: 12/15

· Outdoor Air Delivery Monitoring

· Increased Ventilation

· Construction IAQ Management Plan, During Construction

· Construction IAQ Management Plan, Before Occupancy

· Low-Emitting Materials, Adhesives & Sealants

· Low-Emitting Materials, Paints & Coatings

· Low-Emitting Materials, Carpet Systems

· Indoor Chemical & Pollutant Source Control

· Controllability of Systems, Lighting

· Thermal Comfort, Design

· Thermal Comfort, Verification

· Daylight & Views, Views for 90% of Spaces


Innovation & Design Process: 5/5

· Innovation in Design: SS Cr 4.1 - Reduction in auto use

· Innovation in Design: Green Housekeeping

· Innovation in Design: Credit 1.3

· Innovation in Design: Credit 1.4

· LEED® Accredited Professional


Total Points: 37

Silver: 33-38

Building Enclosure



There are multiple sections for the exterior walls due to the changing façade and geometry of the building.  Three fourths of the building has a typical façade of precast panels, metal panels and punched windows.  The south elevation of the building reveals a curved, glass panel, curtain wall.


The underground parking garage has concrete bearing walls growing in thickness, starting with the thickest at level B4 and working up to a thinner section at the level B1.  At level 1, architectural cast in place concrete columns with a rubbed finish are completely exposed with a curved curtain wall behind them.  Above the first floor, the curved glass, southern curtain wall becomes typical beginning on level 2 and extends up to the roof. On these floors, concrete beams extend to the wall where they support the glazing with a series of precast lateral connections, steel angles, and metal studs.




LEED points are gained with this projects use of a sustainable roofs. Portions of the roof feature green roofs while others are a white EPDM to reflect sun and have minimal solar gain.


The portions of the roof that are not sustainable roofs follow a fairly typical design.  A 1’6” parapet extends above the precast concrete pavers on the top of the roof.  Working down from the pavers there is a thin filter fabric, 3” of rigid board insulation, and finally two layers of reinforced waterproofing membrane.



Building Statistics II

On the roof of the building there is a mechanical penthouse with three, 500 ton chillers that provide chilled water to air handling units located on each floor.  The chillers are equipped with variable speed drive motors for increased efficiency.  There is a central hot water condensing fire tube natural gas boiler which provides the AHUs with warm water in the colder months. The AHUs distribute air through the building with both constant volume and variable air volume units. There is a direct digital control building automation system that is used to the temperature settings and schedules of the mechanical equipment within the building.


The main electrical room of Office Building-G is located on the top floor of the underground parking garage. Pepco supplies Office Building-G with 265/460V, 4000A, 3 phase, 4 wire service.  The main distribution room of the building is located on the top floor of the underground parking structure.  From this location power is stepped down and distributed to 120/208V 400A panel boards located on each floor of the building. There is a four-cycle, liquid cooled diesel powered generator which provides 600kw of continuous standby power.


Lighting techniques used in Office Building-G are fairly typical.  There are different types of fixtures such as recessed, wall mounted, pole and surface targeting.  The majority of the fixtures use high efficiency fluorescent lamps but specific locations call for the use of LED, metal halides, and other specialty lamps. Due to the use of Office Building-G, the majority of the lighting system will be determined depending on the requirements of the tenant that will occupy the space. 


Office Building-G using a wet sprinkler pipe for a fire suppression system throughout the entire building, resulting in a two hour fire rating. The building is constructed of reinforced concrete so there is a minimal amount of spray fire proofing needed but any exposed steel will be coated to reach the required rating. The fire alarm system is designed to comply with the IBC-NFPA as well as all local codes.  Capabilities of the fire system are: stair pressurization, elevator recall, automatic door release, and control of air ducts.

Fire Protection

An internal core houses the majority of the vertical transportation in Office Building-G. Six main elevators, two shuttle elevators and two stair cases are located here and provide access the main floors of the building.  Due to egress requirements, there is a staircase located on the edge of the floor plan. In the underground parking garage there are two hydraulic elevators and five staircases that are used for parking garage transportation but do not extend past the ground floor. 


Office Building-G is a reinforced concrete structure with a typical bay size of 20’ x 45’. Post-tensioned beams run north-south between circular and rectangular columns and rely on a 7” one-way slab to span from beam to beam.  There is an internal concrete shear wall core extending the entire height of Office Building-G.  This core houses the majority of the vertical transportation within the building while providing lateral stiffness and rotational resistance.


Spread footings ranging in sizes of 4’ x 4’ to 15’ x 15’ act as the primary foundation for Office Building-G. The concrete exterior wall of the parking garage is supported by a wall footing around the entire perimeter of the building.  Two large footings (approximately 40’ x 40’ and 40’ x 10’) are located below the internal shear walls.  All foundations are required to be a minimum of 1’ below the low point of the 5” normal weight slab on grade. 

The structural engineer’s design of the structure uses concrete strengths between 3000 psi and 10,000 psi.  A small amount of structural steel is used to support the elevators but the rest of the building is concrete.  5000 psi concrete is primarily used in the slab construction but 8000 psi concrete is utilized below columns and shear walls to account for any punching shear requirements.  Concrete strength of the columns and shear walls vary with the number of floors above them.  Cast in place beams use 5000 psi normal weight concrete and are reinforced with Grade 60 steel as per ACI 318 requirements.  The post-tensioned beams use 5000 psi concrete with seven wire stress relieved strand with a minimum ultimate tensile strength of 270 ksi.


Office Building-G is a new office building that is being built in the eastern part of the United States.  Due to owner restrictions, the exact location and name of the building cannot be given.  The building location is near an existing metro station and also between major roadways in the area, so a detailed site logistics plan will be critical for the project.  Construction trailers are to be placed on the north side of the new building with a temporary access road between them and the site of the new building.  A construction fence will surround the entire site for safety purposes.  Turner Construction is the primary general contractor and will use a design-bid-build delivery system.  Turner has a guaranteed maximum price (GMP) contract with the owner of the office building.  A primary issue that Turner has to take into account is the 4-level parking garage that is to be built underneath the new office building.  Because of the garage, an erosion and sedimentary plan along with a geotechnical report are both critical pieces of information needed for the successful construction of this parking garage and building.  Vibration from the nearby metro station will need to be taken into account during construction along with pedestrians who use the metro daily.  A covered walkway will be used to protect pedestrians from any danger.  The metro has an adjacent construction design manual that Turner will need to comply with.   With all of this taken into account, it is very important for Turner to have a detailed construction plan. 


Office Building-G

Eastern United States

Carl Hubben

Architectural Engineering

Structural Option

Building Statistics


General Building Information

Building Name:



Occupancy Type:

Square Footage:

Number of Stories:


Project Cost:

Construction Dates:

Project Delivery Method:


Office Building-G

Eastern United States

Cannot be disclosed

Non Separated Mixed Use


14 levels of office floor above grade

4 levels of parking below grade

Estimated at $70,000,000

Summer 2010 – July 2011


Primary Project Team

North Bethesda Center Office One LLC



GHT Limited

Parker Rodriguez, Inc

Loiederman Soltesz Associates, Inc

Turner Construction

Schnabel Engineering North,





Structural Engineer:




Landscape Architect:


Civil Engineer:


General Contractor:


Geotechnical Engineer:


User 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 Carl Hubben. 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 4/25/2011, by Carl Hubben and is hosted by the AE Department © 2010