T.Y. Lin International (TYLI) was selected by Shwe Taung Development Company to provide design and seismic analysis services for a new, four-lane elevated flyover. Built to alleviate severe traffic congestion in the busy, fast-growing city of Yangon, the flyover, which runs along Pyay Road, has a total length of close to 500 meters (1640 feet) and crosses Hledan Junction, a major, five-arm intersection located in the heart of Yangon.
Because the flyover is located at the center of the city and serves as a vital part of the city’s landscape, visual aesthetics of the structure was a top priority for TYLI design engineers. Construction technology and a tight production schedule also took precedence in TYLI’s design.
The design-build project, which was TYLI’s first for the country of Myanmar, was completed in just 12 months to minimize disruption to existing traffic during bridge construction.
TYLI Singapore provided design and seismic analysis services.
The flyover is a composite steel girder bridge with a typical span length of 30 meters (98 feet). The main span across Hledan Junction measures 40 meters (131 feet) and is divided into 14 spans with seven steel girders in each span. The width of the deck is 16 meters (15.5 feet), carrying dual carriageways with two lanes of traffic in each direction.
For seismic engineering, lead rubber bearings have been adopted to improve the damping performance of the structure during seismic activities.