THE CONCRETE BRIDGE MAGAZINE

FALL 2018

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/1027820

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F O C U S F O C U S Kleinfelder's combination of engineers, scientists, and construction professionals has provided infrastructure solutions to clients since 1961. The company, which has grown in size and geographic range through a series of acquisitions and expansions, focuses on every aspect of designing and building constructable, efficient, and attractive projects. In-House Expertise One element of Kleinfelder's success derives from its in-house capabilities. "We pride ourselves on being able to provide in-house expertise, especially i n a r e a s l i k e g e o t e c h n i c a l a n d construction management," says Jim Frost, Kleinfelder's San Diego, Calif.,– based West regional structures manager. "We often are building below-grade structures and have the capabilities to design all types of bridges." In the bridge world, the greatest challenges may be found below ground, Frost notes, and such challenges can greatly affect the final design and construction of the structure. "The design often is the easy part of the project," he states. "Our geotechnical services greatly enhance our ability to collaborate easily and create efficient designs," says Robert Torres, a senior program m a n a g e r w h o m a n a g e s t h e geotechnical department in the San Diego, Calif., office. "We work closely with the designers, especially early in the process. It's not as complicated when you're all under one roof and not emailing and setting up meetings." The geotechnical department provides e a r t h q u a k e a n d s e i s m i c d e s i g n , engineering geology, foundation design, geotechnical engineering, and related services. The department "plays an important role in most of our work, but it often goes unnoticed," Torres says. "We deal with issues from the ground down. People never get to see what we do." A good example of the work that this department does can be seen in the 85-year-old North Torrey Pines Road Bridge, which underwent rehabilitation and a seismic retrofit in 2015. When the sufficiency rating of the historic 550-ft-long bridge in Del Mar, Calif., had dropped to 19 by 2008, many people thought it should be replaced. However, the community wanted to save the signature bridge. Kleinfelder conducted "an exhaustive investigation and materials evaluation," says Keith Gazaway, principal engineer in the San Diego, Calif., office. The assessment included delamination surveys, material sampling and testing, and nondestructive and destructive testing. Condition evaluations, seismic retrofit solutions, and replacement options were analyzed and presented in public meetings with detailed visual simulations. Kleinfelder's efforts resulted in the rehabilitation design of the 15-span, cast-in-place reinforced concrete T-girder bridge with a new post-tensioned superstructure consisting of 80 custom- built haunched precast, prestressed concrete girders that replicated the existing structure's appearance. (For more information about this project, see the Fall 2016 issue of ASPIRE ® .) Designing for the Real World Kleinfelder focuses on ensuring that its designs meet every stakeholder's needs while offering efficient constructability by Craig A. Shutt Kleinfelder conducted an extensive investigation and material evaluation on the 85-year-old North Torrey Pines Road Bridge, in Del Mar, Calif. The result was rehabilitation and a seismic retrofit featuring a new post-tensioned superstructure consisting of 80 custom-built haunched precast, prestressed concrete girders that replicated the existing structure's appearance. All Photos: Kleinfelder. 6 | ASPIRE Fall 2018

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