Lynde and Harry Bradley School of Technology & Trade Milwaukee, WI ____________________________________________________________________________________

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Building Summary ________________________________________________________________________________________________________________________________________________________________________

Site

The Lynde and Harry Bradley School of Technology & Trade is a high school owned by the Milwaukee Public School District. The high school rests on the near south side of Milwaukee and is bounded by West National Avenue on the south, South Third Street on the east, South Fourth Street on the west and West Virginia Street on the north. The existing Milwaukee Tech High School was demolished and the new building along with an athletic practice field, asphalt playing courts, and playground for an adjacent elementary school now fills the space. The 280,000 square foot building contains five stories, one occurring below grade, the others above grade.

Architecture

The architecture of the Bradley Tech high school expresses the state-of-the-art teaching equipment that is used within. The school consists of two attached buildings; the North Building housing administration, athletic and support spaces; and the South Building housing academic classrooms and technical lab spaces. The structure is a flexible design aimed to facilitate current and future technologies and consists of a concrete frame and steel roof structure. The engineering and design of the facility makes extensive use of “green-build” principles including natural day lighting, recycled building materials, and an energy-efficient steam heating and cooling system.

Building Envelope

The building consists of a cast-in-place concrete frame which supports a façade of masonry, metal panel, and glazed curtain wall. The roof utilizes curved metal panel and flat built-up asphalt roofing systems.

Jonathan Hill 5 Structural

Lynde and Harry Bradley School of Technology & Trade Milwaukee, WI ____________________________________________________________________________________

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Building Systems

Electrical The power is brought into the building and to a 15kV - 600A switchgear. A 200kW generator provides power to the emergency distribution panel. The electricity is then split and fed to two portions of the building. The north building contains a 1000kVA substation that provides 480Y/277 V to the lighting panels located on each floor, and a 75kVA transformer distributes 208Y/120 V to the receptacle panels. The south building houses a 2000kVA substation which powers the 480Y/277 lighting panels. The power is dropped using a 75kVA transformer to feed the receptacle panels. A 1600 A bus duct runs through the laboratory space feeding 800A distribution panels on each floor.

Lighting

The lighting scheme in Bradley Tech is a very simple one. The interior lights are typically T8 fluorescent fixtures. They are used in an office and classroom atmosphere and distributed evenly to provide adequate lighting levels. The exterior of the building and its walkways are lined with high intensity discharge (HID) fixtures. They are economical option due to their bright light and long life.

Mechanical

The mechanical system is an energy efficient VAV steam heating and cooling system. There are 11 air handling units spread throughout the building supporting a cooling load of 1500MBH. To heat the building numerous water heaters are used with the help of 5 roof top heat recovery units and a thermal wheel. To cool the building a roof top cooling tower and 2 - 400 ton water cooled centrifugal chillers. The design and effectiveness of this system is based of "Green-Build" principles.

Structural

The structural system combines efficient design concepts that utilize both the strength and natural fire resistivity of the material. The foundation system consists of continuous footings and spread footings ranging from 2'-0" to 2'-6" thick. The substructure is a system of load bearing retaining walls that are typically 1'-4" thick. The primary system is a cast-in-place pan and joist system. A typical bay is 32'-0" by 30'-0" filled with a 20" pan and a 5" slab. The roof is a barrel vault roof designed using open web steel joists. Steel purlins are supported using tension wires, much like the cantilevered canopies scattered along the exterior. The lateral loads are distributed through the cast-in-place frame and distributed to the foundation system and then into the soil.

Jonathan Hill 6 Structural

Lynde and Harry Bradley School of Technology & Trade Milwaukee, WI ____________________________________________________________________________________

Jonathan Hill 7 Structural

Fire Protection

The building is protected through a wet fire protection system. Sprinklers are spread throughout the building along with smoke detectors, strobe lights, and pull stations. The emergency exit path is clearly labeled and easy to access. The cast-in-place concrete frame provides the sufficient fire rating between floors.

Transportation

The transportation through the building is kept very simple. One main corridor separates the two sides of the building and connects the two main lobbies. The stairs and elevators are located along the corridor to provide easy access to other levels of the building. There are 4 hydraulic elevators active in Bradley Tech: (2) 3000lb at 150 fpm, (1) 6000lb at 80 fpm, and (1) 15000lb at 50 fpm. The exterior of the building uses concrete walkways to connect the areas of the building with the surround Bradley Tech campus.

Telecommunications

This technical school is fitted with the most up to date telecommunications system. It contains a collapsed fiber-optic backbone from a main cross-connect room to each space, so that students have the capability of accessing the network from any location in the building. Each teaching station is capable of supporting voice, data, and video to the desktop of each student. The facility supports video conferencing, broadcast video, video on demand, and compressed video. The television systems consist of all digital High Definition Televisions.

Special Systems

The engineering and design of the facility makes extensive use of "green-build" principles including natural day lighting, recycled building materials, and an energy-efficient steam heating and cooling system.

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