Presentation Transcript
Failure Investigation of the Sung-Su Bridges Chun K. Seong Saint Martin’s College: Failure Investigation of the Sung-Su Bridges Chun K. Seong Saint Martin’s College Introduction
Sung-Su Bridge
Conclusion
1. Introduction: 1. Introduction Three Dimensions of Structural Art by Professor David P. Billington
Scientific Dimension - efficiency
Social Dimension - economy
Symbolic Dimension - structure’s elegance & expressive power
Scientific Dimension: Scientific Dimension Honesty to State-of-the-art to local engineering and technology
Adhering to the rules of Design Process
Training and skills of the Construction Personnel
Diligent maintenance and inspection
Social Dimension: Social Dimension Political Pressure by over-achieving officials
Economic Pressure due to short and long-range economic development plan
Local’s ego to have the first kind, the tallest, the longest or the largest structure
Forced to conform to the land use plan
Symbolic Dimension: Symbolic Dimension Bridge as a public fixture for everyone
Bridge as the identity of a locality
Crossing a large body of water-source of relaxation, recreation, and a peaceful background,
2. Case Study : 2. Case Study Sung-Su Bridge, Seoul, Korea
Welded and bolted steel truss bridge
Constructed in 1979, failed in 1994
Reconstructed in 1997
Case Study - Sung-su Bridge: Case Study - Sung-su Bridge
Bridge Plan and Elevation: Bridge Plan and Elevation
Suspended Truss at Arch Shaped Steel Truss Bridge: Suspended Truss at Arch Shaped Steel Truss Bridge
Remaining Portion of Arch Shaped Steel Truss Bridge: Remaining Portion of Arch Shaped Steel Truss Bridge
Close-up view of a Hinge Connection at Truss Top Chord : Close-up view of a Hinge Connection at Truss Top Chord
Close-up view of a Hinge Connection at Truss Top Chord : Close-up view of a Hinge Connection at Truss Top Chord
Fractured Shape of the middle Vertical Hanger: Fractured Shape of the middle Vertical Hanger Photo Taken at site Diagram of fracture surface
Paints at weld
Fractured Flange of the West Vertical Hanger: Fractured Flange of the West Vertical Hanger
Reconstruction of the Bridge: Reconstruction of the Bridge
Result of the Investigation: Result of the Investigation Political Pressure – military rules
Socio-Economic Pressure - rapid growth
Conceptual Design of the Bridge
Engineering - no concept of FCM
Construction - no shop drawing
Maintenance - by visual inspection, no access to the failed detail
3. Conclusion: 3. Conclusion Bridge structure is a symbolic fixture
Forming an Identity of a community
Technically proven efficient design, adequately developed and funded construction - elegant structure
Independent cross-checking of the design
Importance of Maintenance and Inspection