ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.
Issue link: http://www.aspiremagazinebyengineers.com/i/306855
12 | ASPIRE , Spring 2010 Denver's T-Rex Project resulted from the Colorado Department of Transportation and the Regional Transportation District teaming to deliver the nation's first multimodal project to use the design-build delivery method. Seventy-five bridges and tunnels were built as part of the project, which has enhanced national, regional, and local mobility along the I-25 and I-225 corridors. Photo: Kiewit Corporation. P E R S P E C T I V E The entire construction team must do its part to ensure sustainable design is effective For generations, building good bridges has proved to be a moving target, as design criteria and standards evolve to meet society's changing needs. Recently, designs have been further complicated by society's increasing demands on bridge infrastructure in the face of dwindling resources. As a result, we hear more and more about the need for "sustainable solutions" in the bridge market. To achieve this goal, all on the construction team must do their part. Those efforts are complicated by the lack of a generally accepted definition of a "sustainable bridge" or a simple litmus test to determine if a bridge design is sustainable. Criteria for sustainable bridges have proven to be somewhat complicated, vague, and at times controversial. Yet sustainable bridge development is essentially about stewardship of our resources and making smart bridge decisions that not only meet society's current needs but also their needs in the future. We face the challenge of maximizing transportation funding in difficult economic times, with an ever-aging bridge inventory and a growing demand for infrastructure. While bridges are built locally, each plays a role in the bigger picture of strategic regional and national infrastructure planning. Accordingly, proper management of our bridges is essential to achieving sustainable bridge solutions on a national, regional, and local level. We all need to be aware of the big picture, but we each can do more to achieve the final goal. First and foremost, everyone involved must stress "life-cycle" costs and economy as the primary goal in bridge design. Sustainable Examples Abound We are beginning to see this "big- picture strategic" thinking around the country. Denver's I-25 Transportation E x p a n s i o n p ro v i d e s a n e x c e l l e n t example of sustainable infrastructure development. Known as the "T-Rex" project, it used a unique collaboration between the Colorado Department of Transportation and the Regional Transportation District to become the nation's first multimodal project to use the design-build delivery method. Completed in 2006, the $1.28-billion Kiewit Corporation-led joint venture reconstructed 17 miles of I-25 and I-225 and constructed 19 miles of double- track, light-rail transit lines, 13 light- rail stations, three parking structures, eight interchanges, and more than 75 bridges and tunnels. All construction was performed to minimize disruption to the public and the environment. by Raymond Paul Giroux, Kiewit Pacific Co. SUSTAINABLE BRIDGES A Contractor's Perspective Perspective_Giroux_spr10-1.indd 12 4/30/14 10:53 AM