Honolulu Rapid Transit Viaduct Phase 1 & 2 - Honolulu, Hawaii


5,238 Segments Stretch Across Oahu

This project is the first ten miles of concrete segmental elevated rapid transit guideway that connects West Oahu with downtown Honolulu and the Ala Moana Center via the Honolulu International Airport on Oahu, Hawaii. The Honolulu Authority for Rapid Transportation (HART) developed the project to improve mobility, enhance reliability, and address the island’s increasing congestion. It will reduce overall commuting times and costs and enhance the quality of life for the residents of Oahu. Kiewit, FIGG and HNTB completed the westernmost ten miles of the project’s guideway system under two design-build contracts which encompass the first two segments of the overall project (Combined Contract Phase 1 & 2). This portion of the project was completed in December 2016.

Precast concrete segmental design was essential to the successful completion of this project. It solved the challenges of material delivery, mobility, and structure erection posed by the project’s mountainous, congested urban location. HART required a unique engineering solution that could only be developed with precast concrete superstructure segments. 7.5 miles of the guideway is above the shoulder or the limited median of the existing 2 to 3 lane roadway facilities, whose medians have intersecting roads and left-turn pocket lanes. The guideway was built from above using precast concrete box girder segments. It has straight and curved sections with a minimum radius of 1,100' for precast sections and 800' for cast-in-place sections and a maximum vertical profile grade of 5.5%.

The superstructure is made of 5,238 precast and 129 cast-in-place trapezoidal segments that are 30' wide with spans between 68' and 151' long. The top slab deck varies in thickness from 8" to 15". The length of precast segments (11') maximizes the legal transporting limits on the roads, eliminating almost 10% of the precast segments that would have been required if typical 10' lengths were used.

The segmental superstructure is supported by 440 columns. The columns at each station celebrate the local culture, with artistic designs cast into the concrete. Concrete segmental provided a wonderful, durable, and constructible solution and provided high-quality aesthetics. This project has been featured in ASPIRE Magazine and was Roads & Bridges Magazine’s #4 Bridge of 2016.

Project Details


Honolulu Authority for Rapid Transit (HART)

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