Seoul, South Korea
Seoul, South Korea

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Kim W.J.,DM Engineering Co. | Cho K.S.,DM Engineering Co. | Lee C.D.,DM Engineering Co. | Kim C.S.,DM Engineering Co. | And 2 more authors.
Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE) | Year: 2012

The Gyopo Bridge is an arch railroad bridge connecting the US military base in Pyeongtaek to the Poseung- Pyeongtaek Railroad. The bridge was designed as a uniquely shaped arch to represent the international cooperation between South Korea and the United States, and also to create visual harmony with Ansung River. The Gyopo Bridge is the longest railroad bridge in South Korea with a new concept, d ouble-tied arch system. The Gyopo Bridge has a single track with a 9,10 m wid e deck and a three-span continuous arch with a 130,00 m long main span and 51,20 m long side spans (232,40 m in to tal). The doub le-tied arch bridge system is a new structural concept that has strengthened the arch ribs of the previous single-tied arch bridge system using "secondary tension tie". Owing to the secondary tension tie, it is also easy to extend the span length of a double-tied arch bridge by increasing the stiffness of arch ribs. Furthermore, the double-tied arch system can reduce th e vibration of the bridge, which will eventually improve the driving safety of traveling trains and prolong the fatigue life of the bridge members.

Kim Y.M.,Korea Institute of Construction Technology | Kwak Y.H.,Korea Institute of Construction Technology | Choi M.S.,DAEWOO e and C Co. | Lee J.J.,DM Engineering Co. | Cho K.S.,DM Engineering Co.
Procedia Engineering | Year: 2011

The New Millennium Bridge in Lot 1 of the Amtae∼Aphae Fixed Link, is a FCM-anchored hybrid two-pylon cable stayed bridge consisting of its high (195m) and low (135m) pylon with two bundle cables in the back span and the pre-construction of the side span method during erection is considered to improve the aerodynamic stability. The design of the bridge for wind was carried out based on extensive numerical analyses and wind tunnel tests: extreme wind climate analysis for typhoon, dynamic wind load (buffeting) analysis, computational fluid dynamics (CFD) analysis and sectional model tests etc. A series of wind tunnel tests were performed to find the harmful wind-induced vibrations: vortex-shedding, buffeting, and flutter. Moreover, some alternatives of the deck section were investigated to find an optimized one for a super long span bridge.

Kwon S.-D.,Chonbuk National University | Lee H.,DM Engineering Company | Lee S.,Chonbuk National University | Kim J.,DM Engineering Company
Journal of Bridge Engineering | Year: 2013

In the current study, wind tunnel tests and buffeting analyses were conducted for a catwalk structure of a suspension bridge under turbulent winds. From the wind tunnel tests, it was found that the Reynolds number effects on the aerostatic coefficients were negligible for the catwalk floor systems. Simple design formulas were proposed to estimate the aerostatic coefficients of catwalks with various solidity ratios and angles of attack. The buffeting analysis results revealed that tying the catwalk to an erecting main cable may be an effective structural countermeasure to reduce the lateral displacements of the catwalk. Stay ropes fastening the catwalk and bridge tower were also found to be effective at alleviating the lateral displacements. © 2013 American Society of Civil Engineers.

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