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- 저자 : Hidehiko Sekiya (검색결과 2 건)
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Hidehiko Sekiya,Masayuki Tai,Mizuki Hayama 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.1
As the number of steel bridges that have been in service for more than 40 years in Japan increases, several types of fatigue damage have been recognized. In particular, damage to web gap plates is often found in metropolitan expressway. In order to implement appropriate repair and reinforcement procedures for damage caused by displacement-induced fatigue, it is important to determine the deformation that results from the passage of vehicles that leads to high strain. Therefore, in the present study, the causes of fatigue damage in web gap plates in an in-service steel girder bridge were investigated using contact displacement gauges, tri-axial strain gauges and microelectromechanical systems inertial measurement units. From the displacement and strain measurements, it was found that most of the strain that occurs in the web gap plate are due to slab deflection. Furthermore, the sign (positive or negative) of the strain response was shown to depend on the driving lane.
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Samim Mustafa,Hidehiko Sekiya,Mizuki Hayama,Chitoshi Miki 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.4
Due to the rapid deterioration of reinforced concrete decks (RCD) under the combined eff ects of deck overloads, weather and salts, the orthotropic steel decks (OSD) that are light weight and require less construction time are being used increasingly to replace old deteriorated decks. In this paper, a numerical investigation was carried out to study the eff ect of reduction in superstructure weight on the earthquake resistance of elevated girder bridges when an existing RCD was being replaced by an OSD. Firstly, an eigenvalue analysis was carried out to study the eff ect of superstructure weight on the global vibrational characteristics of the bridge and then, the evaluation of seismic performances of both the bridge models were carried out by performing a series of non-linear dynamic analysis with input earthquake data in the longitudinal and transverse directions separately and simultaneously. The behavior of the pier bases was examined by monitoring the displacement responses and plastic strains during earthquakes. It was found that the bridge model with OSD exhibits a shorter period of vibrations and a huge improvement in the seismic performance of the bridge was observed by replacing the existing RCD with the OSD. The analysis results could be useful in fi nding a solution for seismic retrofi t of existing girder bridges.
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