The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
Koji Ichii - One of the best experts on this subject based on the ideXlab platform.
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Post-earthquake actions for restoration of Port Structures
2020Co-Authors: Koji Ichii, Takahiro Sugano, Atsushi NozuAbstract:Immediately after a devastating earthquake, many engineers face an engineering challenge. They have to act swiftly to make a series of imPortant engineering decisions in order to obtain the best solution for restoring the damaged Port Structures. The restoration should be made in a limited time span using the available resources and should cause minimum disturbance to the remaining operational functions of a Port. The objective of this paper is to give an overview on a recommended procedure based on the experiences gained from the recent earthquakes, notably the 1995 Great Hanshin (Kobe) earthquake, Japan. The recommended procedure consists of four phases: (1) The first phase is the preliminary investigation of damage, and should be performed within 24 hours after the earthquake. This is to capture an overview of damage to Port facilities and mainly conducted by eye and engineering judgement. (2) The second is the emergency action phase, and performed within 48 hours after the earthquake. This phase is to decide whether or not emergency measures should be implemented to avoid secondary disaster. If the secondary disaster is deemed possible, then emergency actions should be implemented. This phase also includes the decisions on whether or not partially damaged facilities should be utilized for emergency use. (3) The third phase is the emergency restoration phase, and performed within 7 days after the earthquake. This phase is to perform supplementary investigation of damage necessary for implementing emergency restoration measures for partially damaged facilities. Once the emergency restoration measures have been completed, then the partially restored facilities will be used to meet the emergency objectives, including handling emergency cargos for earthquake affected areas. (4) The fourth phase is the tentative restoration phase, and performed within 30 days after the earthquake. This phase is to implement tentative restoration measures for damaged Port Structures deemed feasible in the third phase. Permanent restoration for the rest of the facilities will be performed after the fourth phase, 30 days after the earthquake. The paper addresses the appropriate engineering criteria for decision making in each phase of restoration. Case histories will also be given in the paper.
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surface wave based health monitoring method for a sheet pile quay wall
International Journal of Structural Stability and Dynamics, 2014Co-Authors: Koji Ichii, Keisuke Kitade, Mayumi Kawano, Ikuo TaguchiAbstract:Port Structures such as pile supPorted piers and quay walls generally face severe conditions, and deterioration of Port Structures is often observed. For an example, at a sheet pile quay wall, sheet pile is a structural component which is easily deteriorated by corrosion. As a result of deterioration of sheet pile, the backfilled soil would be washed out due to the tidal action. Suffusion, the phenomena of the washed out of fine particles and loosening of soil layer, is a problem to be considered in the maintenance of a quay wall. Therefore, a health monitoring method for the backfill of a sheet pile quay wall is necessary. In this study, the applicability of a surface-wave method for health monitoring of a sheet pile quay wall was examined. First, the variation of shear wave velocity in the ground due to suffusion and variation in water content is measured from bender element tests. Then, 2D finite element method (FEM) dynamic analysis was conducted to simulate a surface-wave measurement on a sheet pile quay wall. From the result of the analysis, the estimated shear wave velocity profile based on surface-wave method agrees fairly well with the assumed soil profile. Finally, surface-waves were measured at a sheet pile quay wall, and the measured results were compared with the result of Swedish weight sounding test at the site. Furthermore, the difference between the shear wave velocity profiles at ebb tide and that at high tide was successfully measured by the surface-wave method. Thus, the applicability of the surface-wave method for a sheet pile quay wall is demonstrated in this study.
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seismic design of Port Structures
Journal of Japan Association for Earthquake Engineering, 2004Co-Authors: Atsushi Nozu, Koji Ichii, Takahiro SuganoAbstract:As a result of the Kobe disaster in 1995, new analysis methods including the effective-stress analysis for quay walls and pushover analysis for pile-supPorted wharves are introduced in the technical standards for Port and harbour facilities in Japan to assess seismic performance of Structures beyond the limit of force balance. In this article, design practice of Port Structures in Japan is described, with focuses on these new analysis methods. Some of the problems to be solved are also briefly described.
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effective stress analyses of Port Structures
Soils and Foundations, 1998Co-Authors: Koji Ichii, Toshikazu MoritaAbstract:ABSTRACT Effective stress analyses are performed on the seismic response of Port Structures during the 1995 Hyogoken-Nambu earthquake. The Structures analyzed include: caisson type quay walls which moved up to 5 m maximum toward the sea; pneumatic caisson type bridge foundations which moved toward the sea, reducing the distance between the bridge foundations across a sea channel by a total of 0.8 m; and composite breakwaters which settled 2 m. Although these Structures were all a rigid concrete type and shaken by the same earthquake, the mode and extent of deformation/failure were different depending on the backfill and embedment conditions of the Structures. The constitutive model of soil used for the seismic analyses is a multiple mechanism model defined in strain space. The model can take the effect of principal stress axis rotation into account, which is known to play an imPortant role in the cyclic behavior of sand under anisotropic stress conditions. The model parameters are calibrated based on in-situ and laboratory investigations, including in-situ freeze sampling. The results of the effective stress analyses are consistent with those measured, including the mode and extent of deformation/failure, suggesting that the cyclic behavior of soil, idealized through the effective stress model, can explain the variety of seismic response of the Port Structures in a unified manner.
Giulio Montagner - One of the best experts on this subject based on the ideXlab platform.
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integrated topographic gnss remote sensing and gis webgis techniques applied to the study of aquileia river Port Structures
The New Technologies for Aquileia, 2011Co-Authors: R Cefalo, Alexia Cociancich, Michele Di Bartolomeo, Francesca Ferro, Massimo Iansig, G Manzoni, Giulio MontagnerAbstract:Integrated use of multidisciplinary researches have been applied in the last years for the study of Aquileia archeological sites and, in particular the River Port Structures. Since 1992 GPS (Global Positioning System) techniques have been adopted with the aim of linking together various independent topographic networks and georeferencing single relevant points. In 2001 a scientific cooperation between different Institutions and national and international Research Centres has been established and renewed in 2006, in the framework of PICS 3064 CNRS Project. Different 3D topographic, geodetic, remote sensing, laser scanner and geophysical surveys have been performed and analyzed with the principal aim of reconstructing the ancient Aquileia landscape and, in particular, the integrated water system. GIS (Geographical Information System) and WebGIS applications have been implemented by researchers of GeoSNAV Laboratory, University of Trieste, joining all the data on a common cartographic basis, in order to enhance their sharing inside the scientific community.
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The New Technologies for Aquileia - Integrated Topographic, GNSS, Remote Sensing and GIS/WebGIS Techniques Applied to the Study of Aquileia River Port Structures
2011Co-Authors: R Cefalo, Alexia Cociancich, Michele Di Bartolomeo, Francesca Ferro, Massimo Iansig, G Manzoni, Giulio MontagnerAbstract:Integrated use of multidisciplinary researches have been applied in the last years for the study of Aquileia archeological sites and, in particular the River Port Structures. Since 1992 GPS (Global Positioning System) techniques have been adopted with the aim of linking together various independent topographic networks and georeferencing single relevant points. In 2001 a scientific cooperation between different Institutions and national and international Research Centres has been established and renewed in 2006, in the framework of PICS 3064 CNRS Project. Different 3D topographic, geodetic, remote sensing, laser scanner and geophysical surveys have been performed and analyzed with the principal aim of reconstructing the ancient Aquileia landscape and, in particular, the integrated water system. GIS (Geographical Information System) and WebGIS applications have been implemented by researchers of GeoSNAV Laboratory, University of Trieste, joining all the data on a common cartographic basis, in order to enhance their sharing inside the scientific community.
R Cefalo - One of the best experts on this subject based on the ideXlab platform.
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integrated topographic gnss remote sensing and gis webgis techniques applied to the study of aquileia river Port Structures
The New Technologies for Aquileia, 2011Co-Authors: R Cefalo, Alexia Cociancich, Michele Di Bartolomeo, Francesca Ferro, Massimo Iansig, G Manzoni, Giulio MontagnerAbstract:Integrated use of multidisciplinary researches have been applied in the last years for the study of Aquileia archeological sites and, in particular the River Port Structures. Since 1992 GPS (Global Positioning System) techniques have been adopted with the aim of linking together various independent topographic networks and georeferencing single relevant points. In 2001 a scientific cooperation between different Institutions and national and international Research Centres has been established and renewed in 2006, in the framework of PICS 3064 CNRS Project. Different 3D topographic, geodetic, remote sensing, laser scanner and geophysical surveys have been performed and analyzed with the principal aim of reconstructing the ancient Aquileia landscape and, in particular, the integrated water system. GIS (Geographical Information System) and WebGIS applications have been implemented by researchers of GeoSNAV Laboratory, University of Trieste, joining all the data on a common cartographic basis, in order to enhance their sharing inside the scientific community.
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The New Technologies for Aquileia - Integrated Topographic, GNSS, Remote Sensing and GIS/WebGIS Techniques Applied to the Study of Aquileia River Port Structures
2011Co-Authors: R Cefalo, Alexia Cociancich, Michele Di Bartolomeo, Francesca Ferro, Massimo Iansig, G Manzoni, Giulio MontagnerAbstract:Integrated use of multidisciplinary researches have been applied in the last years for the study of Aquileia archeological sites and, in particular the River Port Structures. Since 1992 GPS (Global Positioning System) techniques have been adopted with the aim of linking together various independent topographic networks and georeferencing single relevant points. In 2001 a scientific cooperation between different Institutions and national and international Research Centres has been established and renewed in 2006, in the framework of PICS 3064 CNRS Project. Different 3D topographic, geodetic, remote sensing, laser scanner and geophysical surveys have been performed and analyzed with the principal aim of reconstructing the ancient Aquileia landscape and, in particular, the integrated water system. GIS (Geographical Information System) and WebGIS applications have been implemented by researchers of GeoSNAV Laboratory, University of Trieste, joining all the data on a common cartographic basis, in order to enhance their sharing inside the scientific community.
R Scottini - One of the best experts on this subject based on the ideXlab platform.
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Monitoring Average Wall Thickness of insulated or difficult to access objects with Pulsed Eddy Current
IV Conferencia Panamericana de END Buenos Aires, 2003Co-Authors: R Scottini, H J QuakkelsteijnAbstract:Pulsed eddy current equipment has been successfully applied in corrosion detection for several years now. Whereas field experience on insulated objects has grown significantly, the technique's characteristics make it also highly suitable for other field situations where the object surface is rough or inaccessible. Because (surface) preparations can be avoided the tool provides a fast and cost-effective solution for corrosion detection. An overview of the fundamentals and the RTD-INCOTEST® pulsed eddy current tool for corrosion detection is presented and application ranges are discussed. Several field applications other than insulated objects are presented. These range from the inspection of Port Structures and ship hulls to fire proofing, rough or corroded surfaces and coated objects. These spin-offs offer interesting possibilities in many areas of industry such as civil engineering, shipping and (petro-)chemical and oil & gas.
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Pulsed Eddy Current in Corrosion Detection
Ecndt2002, 2002Co-Authors: M A Robers, R ScottiniAbstract:Pulsed eddy current equipment has been successfully applied in corrosion detection for several years now. Whereas field experience on insulated objects has grown significantly, the technique's characteristics make it also highly suitable for other field situations where the object surface is rough or inaccessible. Because (surface) preparations can be avoided the tool provides a fast and cost-effective solution for corrosion detection. An overview of the fundamentals and the RTD-INCOTEST® pulsed eddy current tool for corrosion detection is presented and application ranges are discussed. Several field applications other than insulated objects are presented. These range from the inspection of Port Structures and ship hulls to fire proofing, rough or corroded surfaces and coated objects. These spin-offs offer interesting possibilities in many areas of industry such as civil engineering, shipping and (petro-)chemical and oil & gas.
Ikuo Taguchi - One of the best experts on this subject based on the ideXlab platform.
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surface wave based health monitoring method for a sheet pile quay wall
International Journal of Structural Stability and Dynamics, 2014Co-Authors: Koji Ichii, Keisuke Kitade, Mayumi Kawano, Ikuo TaguchiAbstract:Port Structures such as pile supPorted piers and quay walls generally face severe conditions, and deterioration of Port Structures is often observed. For an example, at a sheet pile quay wall, sheet pile is a structural component which is easily deteriorated by corrosion. As a result of deterioration of sheet pile, the backfilled soil would be washed out due to the tidal action. Suffusion, the phenomena of the washed out of fine particles and loosening of soil layer, is a problem to be considered in the maintenance of a quay wall. Therefore, a health monitoring method for the backfill of a sheet pile quay wall is necessary. In this study, the applicability of a surface-wave method for health monitoring of a sheet pile quay wall was examined. First, the variation of shear wave velocity in the ground due to suffusion and variation in water content is measured from bender element tests. Then, 2D finite element method (FEM) dynamic analysis was conducted to simulate a surface-wave measurement on a sheet pile quay wall. From the result of the analysis, the estimated shear wave velocity profile based on surface-wave method agrees fairly well with the assumed soil profile. Finally, surface-waves were measured at a sheet pile quay wall, and the measured results were compared with the result of Swedish weight sounding test at the site. Furthermore, the difference between the shear wave velocity profiles at ebb tide and that at high tide was successfully measured by the surface-wave method. Thus, the applicability of the surface-wave method for a sheet pile quay wall is demonstrated in this study.