T. Y. Lin International

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T. Y. Lin International
IndustryCivil and Structural Engineering
FoundedJune 1, 1954
HeadquartersSan Francisco, California
Key people
  • Alvaro Piedrahita, P.E.
  • (President)
  • Man-Chung Tang, Dr., P.E.
  • (Chairman of the Board)
WebsiteOfficial website Edit this at Wikidata

T. Y. Lin International (TYLI) is a global, multi-disciplinary infrastructure services firm. Headquartered in San Francisco, TYLI established its business in the design of long-span bridges and specialty structures.

The firm provides a range of planning, design, construction and project management services to the aviation; bridge; facilities; mobility, planning, and management; ports and marine; rail and transit; and surface transportation industries. TYLI operates from more than 50 regional centers across four continents, and employs a professional staff of more than 2,500 engineers, planners, architects and scientists.[1]


1950s: TYLI was founded on June 1, 1954 by Tung-Yen Lin, a Chinese-American structural engineer recognized worldwide as an innovator in bridge design, engineering, and construction. Lin is credited with standardizing the practical use of prestressed concrete. He is also known for his emphasis on the structural aesthetics aspect of engineering, regardless of a project's economic limitations.[2][3]

1960s–1970s: Lin continued to expand his firm's specialty in prestressed concrete to broader consulting services, with projects that included conventionally reinforced concrete, structural steel, masonry, and timber-framed structures. In 1967, he designed the 18-story shear wall Bank of America building in Managua, Nicaragua. The reinforced concrete tower was one of only two structures left standing after the country's 1972 earthquake.[4] Lin also became known for his design innovations, such as the Rio Colorado Bridge, an upside-down suspension bridge spanning a deep gorge in Costa Rica.[5] In the early '70s, the firm also established offices in Taiwan and Singapore.

1980s: TYLI expanded with new offices in Kuala Lumpur and a merger with Maine-based Hunter-Bellow Associates in the U.S. In 1986, when U.S. President Ronald Reagan presented Lin with the National Medal of Science, he responded by handing the former president a detailed plan for a 50-mile-long (80 km) “Intercontinental Peace Bridge” connecting Alaska and Siberia across the Bering Strait.[6] In 1989, TYLI was acquired by the Dar Group, an international network of professional service firms located in 45 countries.

1990s: Following the Loma Prieta earthquake in California in late 1989, TYLI helped in the development of advanced techniques, engineering tools, and design standards for bridge assessment, the seismic retrofit of existing structures,[7] and the design of new bridges.[8] The firm also completed several acquisitions, including California-based McDaniel Engineering, Chicago-based BASCOR, Washington State's DGES Consulting Engineering, and New York's DRC Consultants. Additionally, the firm opened a new Asia-Pacific office in Chongqing, China.

2000s: U.S. expansion continued with the acquisition of Miami-based H.J. Ross Associates, Inc., Northern California's CCS Planning and Engineering, multi-location FRA Engineering and Architecture, and Medina Consultants on the East Coast. The acquisitions strengthened the firm's services in the areas of ITS/traffic engineering and transportation engineering through its aviation and rail and transit line of businesses for such projects as Miami International Airport's expansion project.[9] In Asia, TYLI oversaw the design of major bridges in China's fast-growing central region,[10] including the Shibanpo Bridge and the Caiyunba Bridge in Chongqing, and the Second Wujiang Bridge in Fulin.[11]

2010s: TYLI oversaw the design of 25 elevated bridges across Taiwan for the island's new High Speed Rail system and the Hoover Dam Bypass Bridge, which is downstream of the Hoover Dam;[12] the Port Mann Bridge in British Columbia, Canada (2012);[13] and the new Eastern Span of the San Francisco-Oakland Bay Bridge (2013).[14][15]


TYLI provides services on all phases of project development and delivery, including:

  • Construction Engineering
  • Construction Support and Inspection
  • Design
  • Design-Build
  • Intelligent Transportation Systems
  • Planning
  • Program Management


TYLI provides services within all major sectors of the infrastructure industry, including:

  • Airports
  • Bridges
  • Buildings
  • Federal Facilities
  • Land Development
  • Ports & Marine
  • Rail & Transit
  • Roadway Systems


Select project list:

See also[edit]


  1. ^ "T.Y. Lin International website".
  2. ^ King, John (18 November 2003). "TUNG-YEN LIN, 1912-2003 / An". San Francisco Chronicle.
  3. ^ DeStefano, Jim (December 2003). "T.Y. Lin (1911-2003)" (PDF). Structure Magazine. Archived from the original (PDF) on March 13, 2014.
  4. ^ Swent, Eleanor (2011). The Father of Prestressed Concrete: Oral history transcript by T.Y. Lin and Eleanor Swent. Biblio Balthazar. pp. 204–207.
  5. ^ "Rio Colorado Bridge". HighestBridges.com.
  6. ^ Woo, Elaine (11 November 2003). "Tung-Yen Lin, 91; Engineer Advocated a Novel Way to Build". Los Angeles Times.
  7. ^ Charles Seim; Santiago Rodriguez (1994). "Golden Gate Seismic Retrofit Project: A reference for approaching the seismic aspects of the Golden Gate Bridge" (PDF). Earthquake Engineering: Tenth World Conference.
  8. ^ "East Span News". San Francisco-Oakland Bay Bridge East Span Seismic Safety Project.
  9. ^ "Airport Master Plan & Capital Improvement Project". Miami International Airport. Retrieved 12 March 2014.
  10. ^ Tang, Man Chung (9 September 2014). "International Bridges: Long Standing". Roads & Bridges. Retrieved May 18, 2015.
  11. ^ Cho, Aileen (2 October 2006). "China's Great Expansion Fuels Boom in High-Profile Designs". Engineering News-Record.
  12. ^ Goodyear, David (October 2012). "Mike O'Callaghan-Pat Tillman Memorial Bridge". Structure magazine. Archived from the original on March 13, 2014.
  13. ^ Fehr, Bradley (February 20, 2010). "New Port Mann Bridge to be widest in Canada". Journal of Commerce. Archived from the original on March 13, 2014.
  14. ^ Newcomb, Tim (28 August 2013). "How They Built the Record-Setting New Bay Bridge Span". Popular Mechanics.
  15. ^ "Under construction: Engineering the Bay Bridge". UC Berkeley College of Engineering. Retrieved 12 March 2014.
  16. ^ Xueshan Liu, Anshuang Liu;, Shanping Wei, Zhong Yang (2010). "Construction of the main span s of the Chongqing Caiyuanba Yangtze River Bridge" (PDF). Arch-Bridges.com. Arch-Bridges.com. Retrieved 17 May 2015.[permanent dead link]
  17. ^ "New Champlain Bridge Corridor Project, Canada". roadtraffic-technology.com. roadtraffic-technology.com. Retrieved 19 May 2016.[unreliable source?]
  18. ^ "Port Everglades Expansion Eller Drive Overpass". PortEverglades.net.
  19. ^ "Tylin International wins tender for construction of the Fourth Bridge" (29 January 2016 Economy). La Estrella de Panama. 29 January 2016. Retrieved 19 May 2016.
  20. ^ "Santa Fe DDI". Retrieved 3 February 2017.
  21. ^ "New Kenneth F. Burns Memorial Bridge Project". MassDOT Project Kenneth F Burns Memorial Bridge.
  22. ^ Fining, Brittany (Winter 2011). "Gold Award Winner: Miami International Airport's North Terminal" (PDF). Owners Perspective Magazine. Retrieved 15 May 2015.
  23. ^ "Sellwood Bridge Replacement Project". SellwoodBridge.org. Multnomah County. Retrieved 3 February 2017.
  24. ^ Bates (10 October 2013), Joe. "Project Watch - Taiwan Taoyuan International Airport". Airport World Magazine. Retrieved 29 April 2015.
  25. ^ Morcos (2 August 2010), Johnny. "CITY STREETS: A Second Wind". Roads & Bridges. Retrieved 29 April 2015.

External links[edit]