Ironbridge International Development II, LLC / Guam Dept. of Education


Amor Design Studios, LLC


Hensel Phelps


Dededo, Guam


This 69,000 SF expansion of Okkodo High School included new classrooms, laboratories, dining area, work and administrative rooms, a standalone culinary arts building, and a 1,500 SF field house. New areas also include an expansion of existing locker rooms and a permanent outdoor open-air stage.

The new facilities allow for the increase of student capacity from 1,200 to 2,000 students. The south end of the expansion is devoted to 21st Century learning and includes physical science, biology, upper level science, and computer labs.

The construction cost was $13.2 million and the project owner, Ironbridge International Development II, LLC, will maintain and lease the school to the Territory of Guam for 20 years, at which time the school will transfer ownership to the Territory.

The project was completed on time and on budget for the beginning of the school year in June 2014.

The Science and Design of Structural Engineering

Construction for this design-assist project consisted of cast-in-place (CIP) concrete load-bearing walls supporting precast, prestressed double tees with CIP topping. The one-story structure was founded on shallow concrete, continuous wall footings and isolated spread footings. Other structural framing options, including tilt-up concrete walls and steel bar joists for the roof, were analyzed and assessed with the design-assist contractor. The selected framing scheme provided a solution that not only accounted for Guam’s high seismicity, typhoon wind loading and corrosive environment, but also addressed schedule constraints, constructability in a remote island location and long-term durability concerns. In the dining area precast, prestressed concrete double tees provide clear spans on the order of 60 ft.

Client Benefits

Since the developer must maintain the facility for 20 years after it is constructed, long-term durability was a key factor in the success of the project.  The client received a very durable, 100% concrete structure within budget and on time to open for the school year.  In order to achieve this goal, BASE worked intimately with the design-assist contractor to study various structural framing options.  Redesign and coordination of various structural elements was expedited as the design was nearly complete when the design-assist contractor was engaged.  The final structural design was both within the contractor’s budget and met or exceeded all the owner’s expectations.