Shuni-ichi Nakamura, Keita Suzumura, Toshimi Tarui, Japan

Manfred Hirt, President of IABSE, presented the 2004 Outstanding Paper Award at the Opening of the IABSE Symposium 'Structures and Extreme Events’ in Lisbon, Portugal, September 14, 2005, to  Shun-ichi Nakamura, Keita Suzumura and Toshimi Tarui for their Paper:

'Mechanical Properties and Remaining Strength of Corroded Bridge Wires'

published in Structural Engineering International, February 2004.

Cables and hanger ropes of suspension bridges often suffer from corrosion. The awarded article describes the research made to evaluate the mechanical properties and the remaining strength of corroded galvanised steel wires with different corrosion levels. The amount of hydrogen absorbed in corroded wires was measured, showing that it did not reach the level to cause hydrogen embrittlement. However the surface of corroded wires is uneven and this roughness seems to reduce the ductility of corroded wires. Broken wires cut from an old suspension bridge were also investigated. Their tensile strength, elongation and chemical composition were almost the same as those of recent bridge wires. However, the wire bends when it is removed, thus indicating high residual stresses in the wires. The fracture surface is similar to that caused by stress corrosion fatigue rather than by hydrogen embrittlement.

The IABSE Outstanding Paper Award is presented each year in recognition of an outstanding article published in "Structural Engineering International", thus encouraging and rewarding contributions of the highest quality. This time the Outstanding Paper Award Committee was chaired by Professor Ulrike Kuhlmann, Germany.

Shun-ichi  Nakamura born in 1950, is Professor at the University of Tokai and is involved in various research activities, including cable corrosion, steel/concrete composite bridges and bridge dynamics.

Keita Suzumura, born in 1965, received a master’s degree in chemistry from University of Hokkaido, in 1990. He has worked for Nippon Steel Corporation as a corrosion prevention engineer of steel structures for 14 years.

Toshimi Tarui, born in 1955, received a master’s degree in metallurgy from Hokkaido University in 1981. He has worked in the R&D centre of Nippon Steel Corporation for 23 years, and is involved in research programs on metallurgy and processing of high carbon steel wire rods for high strength wires.