Safety Assessment of Steel Girder of Overpass Damaged by Collison

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06184
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: Kyushu Institute of Technology
• Principal Investigator: YAMAGUCHI Eiki 九州工業大学, 大学院工学研究院, 教授 (90200609)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 鋼橋 / 車両衝突 / 変形 / 鋼桁 / ウェブパネル / 耐荷力

Outline of Final Research Achievements

Based on two bridges actually damaged by collision, bridge models were constructed and investigated by FEA. The damage patterns of the two bridges are quite different. The damage due to collision was reproduced first. Then the load-carrying capacity of the damaged steel girder and that of the damaged web panel were obtained. The results were compared with those of the intact girder and the intact web panel, respectively. The load-carrying capacity was found changed by collision: it either increased or decreased. The decrease of the load-carrying capacity may threaten the safety of the bridge, but the obtained reduction was insignificant compared with the safety factor implemented in the bridge design. Therefore, it may be stated that the collision doesn't readily lead to the threat of the bridge safety. However, this is for the case when major damage is displacement only. If a bearing is damaged and/or a crack is initiated in the main girder, more careful investigation has to be done.

Free Research Field

橋梁工学，構造工学，応用力学