AHJ Portfolio: Office Building

Office Building

Talus Professional Plaza

This two-story, 31,900 square foot office building with a 1,600 square foot porte cochere is mainly steel construction. The upper and lower roof framing uses open web steel joists, while the two stairwell wings and porte cochere are framed with cold formed steel trusses. The floor framing is concrete slab over steel deck, supported by composite open web steel joists and a beam and column system. The lower roof framing is supported by cold form steel studs with wood sheathing. The remaining structure is supported laterally by an ordinary steel moment frame. The office building is supported by a conventional spread foundation system with concrete slab on grade as the main floor system.

One Front Street

This four-story office building has a total floor area of 71,000 square feet. In addition to the four-stories, a mechanical penthouse floor tops the building, while a full underground-parking garage creates its foundation. The underground parking extends outside the footprint of the building to create another 23,000 square feet of underground parking. This parking area is topped with a framework of steel beams and composite deck that has been designed for both current surface parking and a future four-story building. The design of the building included consideration for a very high water table. Buoyant forces were overcome with mat footings, and coordination with the civil engineer included a network of foundation drainpipes and deep wells. The owner was excited to use a special type of split face CMU that only came in 8” wide units. This presented a challenge to use such a narrow block as both a lateral and gravity-resisting element. The end design used a steel post and beam skeleton for the gravity system, while the CMU skin served as the structure’s lateral system. Careful consideration in detailing allowed the building’s dead and live loads to be resisted independently from any lateral load the building may experience in a seismic or high wind situations.

Boise School District Services Center

This new 35,000 square foot administrative building is made up of a two-story office, large boardroom wing, a two-story lobby space and a third floor mechanical mezzanine. The central core, which include the stairs, elevator, bathrooms and mechanical room is load bearing masonry walls, and serves as the lateral force resisting system. Major beam elements of the building transfer lateral loads to this masonry core, thereby avoiding the need for field welded moment frames or any diagonal bracing. This system provides for a more wide open plan, especially at the second floor and allows a simple and cost effective steel post and beam design for the floor and roof framing.

Washington Mutual Capital Plaza

This eleven story steel frame structure utilized the latest design concepts for seismic and wind resistance by using an eccentric braced frame system, one of the first applications in the Treasure Valley. The building is set in a tight corner lot, abutting the historic Egyptian Theater on one side and a five story parking structure on the other. A combination of drilled piers and large spread footings were provided due to the close proximity of these existing structures.

Veltex Building

This 67,563 square foot five level multi-use structure is constructed of many different structural materials that tie together to resist gravity and lateral loads. The underground parking/basement is made up of concrete walls, columns, and frames that support the upper levels. The upper levels are steel beams with composite concrete and steel floor deck with steel columns to support the gravity loads. The lateral forces are resisted with steel frames over a majority of the structure with a concrete masonry wall at the property line. The main challenge with this project was the numerous transfer columns and girders from level to level to provide a direct load path to the foundation. These transfer elements were required as a result of the varying column layouts at each level. The layouts at each level are driven from its required uses (i.e. retail, office, residential).