Case Study - Alexander Court Vertical Expansion

Case Study - Alexander Court Vertical Expansion

Presented By:

Mike Goss - President Rathgeber/Goss &

David Smith - Vice President Holbert Apple Associates

Alexander Court is a major building repositioning project in the core of WashingtonD.C.'s central business district.  The upgrade involved combining 2000 L St NW, and 8-story office building with 3 levels of below ground parking, with an 11-story office building.  The result is an entirely redesigned building that connects both original buildings with a modernized 2-story atrium.  The result is over 1,000 linear feet of window line per floor and nearly 800,000 sf of state-of-the-art office space.  Originally constructed in 1966, with structural design by T.Y. Lin, 2000 L Street was one of DC's first cast-in-place post-tensioned concrete office buildings.  The existing structure is unique using 8" thick slabs to create 41'-0" bays with 15ft cantilevers at the east and west and a 10 feet cantilever at the north and little to no mild reinforcing steel within the 2-bay post tensioned slab.  Success on this project was made possible because of collaboration from several segments of the structural engineering community.  The project's Structural Engineer of Record Rathgaber/Goss Associates along with Holbert Apple Associates, hired by the general contractor for construction phase design assistance, and the strengthening engineering division of Structural, a specialty contractor, all played a significant role in the project.

Snacks will be provided.