TYLin is a global, multi-disciplinary infrastructure services firm. Headquartered in

San Francisco San Francisco (; Spanish language, Spanish for "Francis of Assisi, Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California. The city proper is the List of Ca ...

, TYLin 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. TYLin operates from more than 50 regional centers across four continents, and employs a professional staff of more than 3,000 engineers, planners, architects and scientists.

History

1950s: T.Y. Lin International was founded on June 1, 1954, by

Tung-Yen Lin Tung-Yen Lin (; November 14, 1912 – November 15, 2003) was a Chinese-American structural engineer who was the pioneer of standardizing the use of prestressed concrete. Biography Born in Fuzhou, Republic of China (ROC), as the fourth of ele ...

, a Chinese-American

structural engineer Structural engineers analyze, design, plan, and research structural components and structural systems to achieve design goals and ensure the safety and comfort of users or occupants. Their work takes account mainly of safety, technical, economic ...

recognized worldwide as an innovator in bridge design, engineering, and construction. Lin is credited with standardizing the practical use of

prestressed concrete Prestressed concrete is a form of concrete used in construction. It is substantially "prestressed" ( compressed) during production, in a manner that strengthens it against tensile forces which will exist when in service. Post-tensioned concreted i ...

. He is also known for his emphasis on the structural aesthetics aspect of engineering, regardless of a project's economic limitations. 1960s1970s: Lin continued to expand his firm's specialty in prestressed concrete to broader consulting services, with projects that included conventionally

reinforced concrete Reinforced concrete (RC), also called reinforced cement concrete (RCC) and ferroconcrete, is a composite material in which concrete's relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having hig ...

structural steel Structural steel is a category of steel used for making construction materials in a variety of shapes. Many structural steel shapes take the form of an elongated beam having a profile of a specific cross section. Structural steel shapes, sizes, ...

masonry Masonry is the building of structures from individual units, which are often laid in and bound together by mortar; the term ''masonry'' can also refer to the units themselves. The common materials of masonry construction are bricks, building ...

, and timber-framed structures. In 1967, he designed the 18-story

shear wall In structural engineering, a shear wall is a vertical element of a system that is designed to resist in-plane lateral forces, typically wind and seismic loads. In many jurisdictions, the International Building Code and International Residential Co ...

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. Lin also became known for his design innovations, such as the Rio Colorado Bridge, an upside-down

suspension bridge A suspension bridge is a type of bridge in which the deck (bridge), deck is hung below suspension wire rope, cables on vertical suspenders. The first modern examples of this type of bridge were built in the early 1800s. Simple suspension bridg ...

spanning a deep gorge in Costa Rica. In the early '70s, the firm also established offices in Taiwan and Singapore. 1980s: T.Y. Lin International 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 The National Medal of Science is an honor bestowed by the President of the United States to individuals in science and engineering who have made important contributions to the advancement of knowledge in the fields of behavioral and social scienc ...

, he responded by handing the former president a detailed plan for a “

Intercontinental Peace Bridge A Bering Strait crossing is a hypothetical bridge or tunnel that would span the relatively narrow and shallow Bering Strait between the Chukotka Peninsula in Russia and the Seward Peninsula in the U.S. state of Alaska. The crossing would prov ...

” connecting Alaska and Siberia across the Bering Strait. In 1989, T.Y. Lin International was acquired by the Dar Group, an international network of professional service firms located in 45 countries. 1990s: Following the

Loma Prieta earthquake The 1989 Loma Prieta earthquake occurred on California's Central Coast on October 17 at local time. The shock was centered in The Forest of Nisene Marks State Park in Santa Cruz County, approximately northeast of Santa Cruz on a section of t ...

in California in late 1989, T.Y. Lin International helped in the development of advanced techniques, engineering tools, and design standards for bridge assessment, the

seismic retrofit Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. With better understanding of seismic demand on structures and with our recent exp ...

of existing structures, and the design of new bridges. 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 Transportation engineering or transport engineering is the application of technology and scientific principles to the planning, functional design, operation and management of facilities for any mode of transportation in order to provide for th ...

through its aviation and rail and transit line of businesses for such projects as Miami International Airport's expansion project. In Asia, T.Y. Lin International oversaw the design of major bridges in China's fast-growing central region, including the Shibanpo Bridge and the Caiyunba Bridge in Chongqing, and the Second Wujiang Bridge in Fulin. 2010s: T.Y. Lin International 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 Hoover Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona. It was constructed between 1931 and 1936 during the Great Depression and was dedicated on Se ...

; the

Port Mann Bridge The Port Mann Bridge is a 10-lane cable-stayed bridge in British Columbia, Canada that opened to traffic in 2012. Carrying 10 lanes of traffic with space reserved for a light rail line, it is the second widest bridge, after the San Francisco-O ...

in British Columbia; Canada (2012); the new Eastern Span of the San Francisco-Oakland Bay Bridge (2013) and the

Champlain Bridge, Montreal (2019-present) Samuel de Champlain (; Fichier OrigineFor a detailed analysis of his baptismal record, see RitchThe baptism act does not contain information about the age of Samuel, neither his birth date nor his place of birth. – 25 December 1635) was a Fre ...

, also called the Samuel De Champlain Bridge, in Montreal, Quebec, Canada.

Services

TYLin 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

Industries

TYLin provides services within all major sectors of the infrastructure industry, including: * Airports * Bridges * Buildings * Federal Facilities * Land Development * Ports & Marine * Rail & Transit * Roadway Systems * Water Systems

Projects

Select project list: *

Arizona Veterans Memorial Coliseum Arizona Veterans Memorial Coliseum is a 14,870-seat multi-purpose indoor arena in Phoenix, Arizona, located at the Arizona State Fairgrounds. It hosted the Phoenix Suns of the National Basketball Association from 1968 to 1992, as well as indoor ...

Phoenix, Arizona *

Arthur Ravenel Jr. Bridge The Arthur Ravenel Jr. Bridge (also known as the Ravenel Bridge and the Cooper River Bridge) is a cable-stayed bridge over the Cooper River in South Carolina, US, connecting downtown Charleston to Mount Pleasant. The bridge has a main span ...

Charleston, South Carolina * Automated People Mover Guideway,

Orlando International Airport Orlando International Airport is a major public airport located 6 miles (10 km) southeast of Downtown Orlando, Florida. In 2021, it handled 19,618,838 passengers, making it the busiest airport in the state and seventh busiest airport i ...

Orlando, Florida * Bataan–Cavite Interlink Bridge

Manila Bay Manila Bay ( fil, Look ng Maynila) is a natural harbor that serves the Port of Manila (on Luzon), in the Philippines. Strategically located around the capital city of the Philippines, Manila Bay facilitated commerce and trade between the Phili ...

, Philippines *Bayshore Bikeway – San Diego, California * Brookfield Floating Bridge (

Sunset Lake Floating Bridge The Sunset Lake Floating Bridge is a floating bridge that carries Vermont Route 65 across Sunset Lake in Brookfield, Vermont, United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US ...

) Brookfield, Vermont
Caijia Bridge
hongqing, China * Caiyuanba Yangtze River BridgeChongqing, China *

California High-Speed Rail California High-Speed Rail (also known as CAHSR or CHSR) is a publicly funded high-speed rail system currently under construction in California in the United States. Planning for the project began in 1996, when the California Legislature and Gover ...

Central Valley Line *

California Incline The California Incline is a slanted road in Santa Monica, California, connecting Ocean Avenue with State Route 1 (Pacific Coast Highway or PCH). It technically is the last link, the western end of California Avenue, a minor east–west str ...

Bridge and Idaho Avenue Pedestrian Overcrossing Santa Monica, California *

,(Samuel De Champlain Bridge) Montreal, Quebec, Canada * Cermak-McCormick Place stationChicago, Illinois *

Jamuna Bridge Bangabandhu Bridge, also known as the Jamuna Multi-purpose Bridge ( bn, যমুনা বহুমুখী সেতু ''Jomuna Bohumukhi Setu'') is a bridge opened in Bangladesh in June 1998. It connects Bhuapur on the Jamuna River's east b ...

Tangail Tangail ( bn, টাঙ্গাইল, ), is a major city within the Dhaka Division in central Bangladesh. It sits on the bank of the Louhajang River, north-west of Dhaka, the nation's capital. It is considered to be the main urban area of ...

and

Sirajganj Sirajganj ( bn, সিরাজগঞ্জ) is a city in north-western Bangladesh on the right bank of the Jamuna River. It is the administrative headquarters of Sirajganj District, and with a population of 167,200 is the fourteenth most populo ...

Bangladesh Bangladesh (}, ), officially the People's Republic of Bangladesh, is a country in South Asia. It is the eighth-most populous country in the world, with a population exceeding 165 million people in an area of . Bangladesh is among the mos ...

* Cinta Costera - Panama City, Panama * Chicago Transit Authority (CTA) Red Line ModernizationChicago, Illinois * CTA Blue Line Station Improvements – Chicago, Illinois *

Red Line (CTA) The Red Line is a rapid transit line in Chicago, run by the Chicago Transit Authority (CTA) as part of the Chicago "L" system. It is the busiest line on the "L" system, with an average of 73,273 passengers boarding each weekday in 2021. The rou ...

and

Purple Line (CTA) The Purple Line of the Chicago "L" is a route on the northernmost section of the system. Normally, it extends south from in Wilmette, passing through Evanston to , on Chicago's North Side. In 2021, the average weekday boardings on the Purple Li ...

Modernization – Chicago, Illinois * Dublin Link – Dublin, Ohio *

Egongyan Rail Transit Bridge The Egongyan Rail Transit Bridge is a suspension bridge carrying the Chongqing Rail Transit Loop line across the Yangtze. It connects Jiulongpo District in the west with Nan'an District in the east. The Egongyan Rail Transit Bridge is located abo ...

– Chongqing, China *

El Dorado International Airport El Dorado International Airport is an international airport serving Bogotá, Colombia and its surrounding areas. The airport is located mostly in the Fontibón district of Bogotá, although it partially extends into the Engativá district and ...

Bogota, Colombia * Elgin-O’Hare Western Access Project,

Illinois Route 390 Illinois Route 390 (IL 390), previously known as the Elgin–O'Hare Expressway, now known as the Elgin–O'Hare Tollway, is a electronic toll highway in northeastern Illinois. IL 390 currently connects U.S. Route 20 (US&nb ...

DuPage and Cook Counties, Illinois * Eller Drive and Intermodal Container Transfer Facility (ICTF) Overpass -

Broward County, Florida Broward County ( , ) is a county in the southeastern part of Florida, located in the Miami metropolitan area. It is Florida's second-most populous county after Miami-Dade County and the 17th-most populous in the United States, with over 1.94 m ...

* 4th Bridge over the

Panama Canal The Panama Canal ( es, Canal de Panamá, link=no) is an artificial waterway in Panama that connects the Atlantic Ocean with the Pacific Ocean and divides North and South America. The canal cuts across the Isthmus of Panama and is a conduit ...

Panama City, Panama * I-25/Cerrillos Road

Diverging diamond interchange A diverging diamond interchange (DDI), also called a double crossover diamond interchange (DCD), is a subset of diamond interchange in which the opposing directions of travel on the non-freeway road cross each other on either side of the inte ...

Santa Fe, New Mexico *I-395 Miami Corridor Reconstruction – Miami, Florida *I Street Bridge Replacement – Sacramento, California *

Interstate 10 Interstate 10 (I-10) is the southernmost cross-country highway in the American Interstate Highway System. I-10 is the fourth-longest Interstate in the United States at , following I-90, I-80, and I-40. This freeway is part of the originally pl ...

/Jefferson Street Interchange - Indio, California *Joliet Gateway Center – Joliet, Illinois *Kenneth F. Burns Memorial Bridge -

Lake Quinsigamond Lake Quinsigamond (also ''Long Pond'') is a body of water situated between the city of Worcester and the town of Shrewsbury in Worcester County, Massachusetts, United States. It is 4 miles (6 km) long, between 50 and 85 feet (15 and 26 m) ...

, Central Massachusetts *

Los Angeles International Airport Los Angeles International Airport , commonly referred to as LAX (with each letter pronounced individually), is the primary international airport serving Los Angeles, California and its surrounding metropolitan area. LAX is located in the W ...

Los Angeles World Airports Los Angeles World Airports (LAWA) is the airport authority that owns and operates Los Angeles International Airport (LAX) and Van Nuys Airport (VNY) for the city of Los Angeles, California. LAWA also owns and manages aviation-related property n ...

Utility and Landside Access Modernization Program Enabling Project – Los Angeles, California *

Miami International Airport Miami International Airport , also known as MIA and historically as Wilcox Field, is the primary airport serving the greater Miami metropolitan area with over 1,000 daily flights to 167 domestic and international destinations, including most co ...

Miami, Florida *

Mike O'Callaghan – Pat Tillman Memorial Bridge Mike may refer to: Animals * Mike (cat), cat and guardian of the British Museum * Mike the Headless Chicken, chicken that lived for 18 months after his head had been cut off * Mike (chimpanzee), a chimpanzee featured in several books and docume ...

(Hoover Dam Bypass Bridge)Arizona-Nevada * Navy Pier Flyover Lakefront Trail Improvements – Chicago, Illinois * Niagara Falls State Park Rehabilitation – Niagara Falls, New York *

Panama Metro The Panama Metro ( es, Metro de Panamá) is a rapid transit system in Panama City, Panama. It links the south and the east of the metropolitan area to the city center. The metro was inaugurated on April 5, 2014, and it entered revenue service tw ...

Line 1 - Panama City, Panama *

Line 2 - Panama City, Panama *

Port of Miami Tunnel The Port of Miami Tunnel (also State Road 887) is a bored, undersea tunnel in Miami, Florida. It consists of two parallel tunnels (one in each direction) that travel beneath Biscayne Bay, connecting the MacArthur Causeway on Watson Island wi ...

– Miami, Florida *

– Vancouver, BC, Canada * Puente Centenario -

Republic of Panama *

Rex T. Barber Veterans Memorial Bridge The Rex T. Barber Veterans Memorial Bridge is a concrete arch bridge in the western United States; it spans the Crooked River gorge in Jefferson County in central Oregon. Designed by T. Y. Lin International, the bridge was completed in 2000 ...

Jefferson County, Oregon *

San Francisco–Oakland Bay Bridge The San Francisco–Oakland Bay Bridge, known locally as the Bay Bridge, is a complex of bridges spanning San Francisco Bay in California. As part of Interstate 80 in California, Interstate 80 and the direct road between San Francisco and Oakland ...

New East Span (Bay Bridge)Oakland, California *

Sellwood Bridge The Sellwood Bridge is a deck arch bridge that spans the Willamette River in Portland, Oregon, in the United States. The current bridge opened in 2016 and replaced a 1925 span that had carried the same name. The original bridge was Portland's first ...

Portland, Oregon *

Sidney Lanier Bridge The Sidney Lanier Bridge is a cable-stayed bridge that spans the Brunswick River (Georgia), Brunswick River in Brunswick, Georgia, carrying four lanes of U.S. Route 17 in Georgia, U.S. Route 17. The current bridge was built as a replacement to t ...

Brunswick, Georgia *

Sheikh Jaber Al-Ahmad Al-Sabah Causeway The Sheikh Jaber Al-Ahmad Al-Sabah Causeway is a causeway in Kuwait with an estimated construction value of approximately US$3 billion Under China's Belt and Road Initiative, the causeway is part of the first phase of the Silk City project. The ...

– Kuwait *South Carolina Aeronautical Training Center for

Trident Technical College Trident Technical College (TTC) is a public community college with its main campus in Charleston, South Carolina and other campuses throughout Berkeley, Charleston, and Dorchester counties. It is part of the South Carolina Technical College System ...

– N. Charleston, South Carolina *

Taiwan Taoyuan International Airport Taiwan Taoyuan International Airport is an international airport serving Taipei and northern Taiwan. Located about west of Taipei in Dayuan District, Taoyuan, the airport is Taiwan's largest. It was also the busiest airport in Taiwan before t ...

Taipei, Taiwan * The EsplanadeTheatres on the BaySingapore * Tilikum Crossing, ''Bridge of the People''Portland, Oregon * Tocumen International Airport Expansion Program - Panama City, Panama * Twin River Bridges – Chongqing, China *

Victoria Theatre and Concert Hall The Victoria Theatre and Concert Hall is a performing arts centre in the Central Area of Singapore, situated along Empress Place. It is a complex of two buildings and a clock tower joined together by a common corridor; the oldest part of the ...

Singapore *

Wacker Drive Wacker Drive is a major multilevel street in Chicago, Illinois, running along the south side of the main branch and the east side of the south branch of the Chicago River in the Loop.Hayner, Don and Tom McNamee, ''Streetwise Chicago'', "Wacker D ...

ReconstructionChicago, Illinois *

United States Military Academy The United States Military Academy (USMA), also known metonymically as West Point or simply as Army, is a United States service academy in West Point, New York. It was originally established as a fort, since it sits on strategic high groun ...

West Point, New York

References

External links