Developer/Owner

US Army Corps of Engineers

Architect

CDS International

Contractor

Hawaiian Dredging Construction Company, Inc.

Location

Schofield Barracks, Hawaii

Background

The project consists of the design-build of a six-story, approximately 75,000 SF UEPH for 192 soldiers. The primary structural system will consist of cast-in-place (CIP) concrete transverse walls and CIP floor/roof slabs constructed with a tunnel-form framing system. Exterior walls in the longitudinal direction will be constructed using insulated concrete forms (ICF). The ground floor slab and wall footings will be cast monolithically. The structure will meet AT/FP requirements including progressive collapse mitigation and blast hardening where insufficient standoff distances exist. There is also a central plant.

The Science and Design of Structural Engineering

Because of tight site constrains, the building does not meet the minimum standoff distances for conventional construction. Blast hardening was required for the exterior faces of the building and portions of the walls within the open breezeway. The exterior walls were all CIP concrete constructed with a tunnel-form system and ICFs. Using concrete or CMU walls within the breezeways would hinder the progress and efficiency of the tunnel-form system so a blast-resistant stud wall system was developed that also met all architectural and constructability requirements.

Client Benefits

Cost and schedule benefits were realized by the contractor by the use of the ICF system for the exterior walls that enclose the ends of the tunnel-form system. In addition to the insulation value of the ICF walls, BASE employed a multi-hazard approach by designing these walls to act as both shear walls and to resist exterior blast loads.