RESEARCH INTERESTS

•  I. Real-time hybrid simulation (RTHS)

• • SNU – U of T collaboration project: ‘Hybrid simulation of a suspended bridge deck subjected to wind load.’

  • Visiting student (Prof. Oh-sung Kwon), the University of Toronto, 2018.01-2019.02

  • The RTHS system simulates the vertical/torsional motion with 4 linear motors and directly measures the wind force using load cells.

  • Ph. D Thesis, 1 SCI(E) paper and 4 international conference papers

•  II. Wind resistance design of cable-supported bridge during the construction stage

• • Yeong Gwang cable-stayed bridge with POSCO/DM engineering (2011-2012): 2-dimensional section model wind tunnel test for wind resistance design and extraction of the aero-static and dynamic coefficients.

  • Jido-Imja cable-stayed bridge with POSCO (2013-2014): 2-dimensional section model/ 3-dimensional full-scale wind tunnel test for wind resistance design. Proposed the modified deck shape attached extended lower plate and flap for mitigating the torsional VIV and flutter phenomena through free-vibration tests and PIV tests.

  • Sheik Jaber Al-Almad Al-Sabah Causeway Project with Hyundai E&C (2013-2014): 2-dimensional section model/ free-standing pylon wind tunnel test for wind resistance design.

  • Taeha-Hwangtogumi pedestrian bridge (2017): 2-dimensional section model wind tunnel test to extract the aero-static and dynamic coefficients.

  • Footbridge (Ganhyeon Tourist Site, Daewangam Suspension Bridge, Hantan River Suspension Bridge) wind stability evaluation (2019~2023): 2-dimensional section model, flutter instability assessment (frequency/time-domain analysis)

•  III. A deeper understanding of vibration caused by wind

• • Development of the force-controlled steady-state excitation apparatus (funded by the Super Long Span Bridge R&D project, 2012-2015): This apparatus was developed to extract flutter derivatives in steady-state conditions. This condition further satisfies the conditions assumed by Scanlan (1971). 1 patent and 3 international conference papers

  • Aeroelastic Characteristics and Wind Pressure Distribution of Twin Deck Sections with CFD simulation and Wind-Tunnel Test with COWI A/S (2015-2016): Measurement of wind distribution and aero-elastic parameters according to gap distance for twin-deck bridge

  • Cause investigation of the vortex-induced vibration (VIV) in the Yi-Sun-Shin suspension bridge (2015): A series of wind tunnel tests revealed the main cause of the VIV was temporary screens applied over the guardrails to shield the curing surface during the replacement of epoxy-coated pavement. The damping ratio of the triggered mode for VIV was the lowest among the investigated modes and estimated to be the level of the design-damping ratio. 2 SCI (E) papers and 4 international conference papers

  • IABSE WG10(Super-Long Span Bridge Aerodynamics) member (2016-2017): The objective of this working group is as follows: 1) Analysis of the different methods developed by researchers and designers involved in bridge design, 2) Definition of guidelines identifying a procedure to obtain the data necessary for the computation. Among the results of the various research groups, the SNU group showed good analysis results with Politec di Milano, Europe’s leading wind engineering research team responsible for the design of wind resistance of the Messina Bridge.