In the present communication the various earthquake resistant regulations which deal with the sub... more In the present communication the various earthquake resistant regulations which deal with the subject of soil-structure interaction have been reviewed and presented. The respective parts, which deal with the subject under consideration, of Eurocode 8 and ATC-3-06 are also reviewed. Due to the soil-structure interaction, reduction factors of the seismic design forces are provided by the various codes, while an increase of the natural period of the structure and of the overall seismic design displacements are provided as well. Mainly, the most codes dealing with the problem, provide reduction factors for the overturning moments of the structure along the height. This reduction is higher in the base. Depending on the existing seismotectonic regime in combination to the prevailing soil conditions that happen to occur during destructive past earthquakes, some of the codes, increase or decrease the reduction of the design seismic forces due to the Soil-Structure Interaction. It has been observed, also, that between two successive editions of the same code, the soil-structure interaction problem is dealt with, differently.
... Institute of Technology ROY G. JOHNSTON, Brandow and Johnston Associates, Los Angeles RB MATT... more ... Institute of Technology ROY G. JOHNSTON, Brandow and Johnston Associates, Los Angeles RB MATTHIESEN, Seismic Engineering ... of the Ebasco Services geotechnical staff are gratefully acknowledged and appreciated: Samir Khoury, Robert Cannon, Frederic Snider, Sarah ...
At present, there are technical limitations in the field of safety and design of storage racks in... more At present, there are technical limitations in the field of safety and design of storage racks in seismic areas. To solve some of these limitations, the EU sponsored through the Research Fund for Coal and Steel an RTD project titled “Storage Racks in Seismic Areas” (acronym SEISRACKS). This paper describes the main research activities and obtained results of the project, initiated in December 2004 and terminated in June 2007.Peer reviewe
Proceedings of the Institution of Civil Engineers - Structures and Buildings, 2005
An experimental study on the seismic response of cold-formed steel tubular members functioning as... more An experimental study on the seismic response of cold-formed steel tubular members functioning as bracing members in concentrically braced frames is described. A number of shake table tests were carried out to examine member and storey performance under earthquake loads. Three different square and rectangular hollow cross-sections were utilised for the bracing members. It is shown that maximum brace tensile forces can be over 30% higher than those estimated using the actual yield strength, due to strain hardening and strain rate effects. Moreover, the experimental storey shear can exceed that predicted by design procedures by more than 50%. The tests also indicate that the ductility demand under seismic loading can be estimated reasonably well for the frame models using a conventional equal-energy idealisation. In addition, the results illustrate generally satisfactory performance for braces with member slenderness exceeding typical limits in seismic codes.
Proceedings of the Institution of Civil Engineers - Structures and Buildings, 2005
An experimental study on the seismic response of cold-formed steel tubular members functioning as... more An experimental study on the seismic response of cold-formed steel tubular members functioning as bracing members in concentrically braced frames is described. A number of shake table tests were carried out to examine member and storey performance under earthquake loads. Three different square and rectangular hollow cross-sections were utilised for the bracing members. It is shown that maximum brace tensile forces can be over 30% higher than those estimated using the actual yield strength, due to strain hardening and strain rate effects. Moreover, the experimental storey shear can exceed that predicted by design procedures by more than 50%. The tests also indicate that the ductility demand under seismic loading can be estimated reasonably well for the frame models using a conventional equal-energy idealisation. In addition, the results illustrate generally satisfactory performance for braces with member slenderness exceeding typical limits in seismic codes.
It is not certain that a historical and monumental building that sustained successfully the effec... more It is not certain that a historical and monumental building that sustained successfully the effects of previous earthquakes will endure the forthcoming ones. In most cases, previous earthquakes have already caused minor or major non-structural or structural damage. The accumulation of this damage may severely affect the antiseismic performance to a future earthquake with larger acceleration, velocity and displacement values and its effects especially when other damaging factors including physicochemical decay of structural settlements, differential settlements, possible fires among others, have caused further reduction of the bearing capacity of the building. Thus, the need for the preservation of historical and monumental buildings and their strengthening against seismic risk and related damage is evident and crucial. All methods and techniques of preservation and strengthening should be applied to these structures with the least possible alteration of their form. Besides the prese...
Earthquakes have demonstrated the vulnerability of buried pipelines, mainly to 'non-dynamic&#... more Earthquakes have demonstrated the vulnerability of buried pipelines, mainly to 'non-dynamic' seismic deformations of the ground, such as liquefaction, landslide and fault movement. This paper presents an analysis procedure that is applicable to both horizontal and vertical fault movement, either for strike slip or reverse strike slip fault. Modifications to an existing computer code have been made so that it includes the previously mentioned parameters, taking also into consideration the severe reduction of the flexural stiffness of the pipe due to large axial forces that appear. Numerous parametric solutions are presented, commented and compared to the results of other investigators.
In the present communication the various earthquake resistant regulations which deal with the sub... more In the present communication the various earthquake resistant regulations which deal with the subject of soil-structure interaction have been reviewed and presented. The respective parts, which deal with the subject under consideration, of Eurocode 8 and ATC-3-06 are also reviewed. Due to the soil-structure interaction, reduction factors of the seismic design forces are provided by the various codes, while an increase of the natural period of the structure and of the overall seismic design displacements are provided as well. Mainly, the most codes dealing with the problem, provide reduction factors for the overturning moments of the structure along the height. This reduction is higher in the base. Depending on the existing seismotectonic regime in combination to the prevailing soil conditions that happen to occur during destructive past earthquakes, some of the codes, increase or decrease the reduction of the design seismic forces due to the Soil-Structure Interaction. It has been observed, also, that between two successive editions of the same code, the soil-structure interaction problem is dealt with, differently.
... Institute of Technology ROY G. JOHNSTON, Brandow and Johnston Associates, Los Angeles RB MATT... more ... Institute of Technology ROY G. JOHNSTON, Brandow and Johnston Associates, Los Angeles RB MATTHIESEN, Seismic Engineering ... of the Ebasco Services geotechnical staff are gratefully acknowledged and appreciated: Samir Khoury, Robert Cannon, Frederic Snider, Sarah ...
At present, there are technical limitations in the field of safety and design of storage racks in... more At present, there are technical limitations in the field of safety and design of storage racks in seismic areas. To solve some of these limitations, the EU sponsored through the Research Fund for Coal and Steel an RTD project titled “Storage Racks in Seismic Areas” (acronym SEISRACKS). This paper describes the main research activities and obtained results of the project, initiated in December 2004 and terminated in June 2007.Peer reviewe
Proceedings of the Institution of Civil Engineers - Structures and Buildings, 2005
An experimental study on the seismic response of cold-formed steel tubular members functioning as... more An experimental study on the seismic response of cold-formed steel tubular members functioning as bracing members in concentrically braced frames is described. A number of shake table tests were carried out to examine member and storey performance under earthquake loads. Three different square and rectangular hollow cross-sections were utilised for the bracing members. It is shown that maximum brace tensile forces can be over 30% higher than those estimated using the actual yield strength, due to strain hardening and strain rate effects. Moreover, the experimental storey shear can exceed that predicted by design procedures by more than 50%. The tests also indicate that the ductility demand under seismic loading can be estimated reasonably well for the frame models using a conventional equal-energy idealisation. In addition, the results illustrate generally satisfactory performance for braces with member slenderness exceeding typical limits in seismic codes.
Proceedings of the Institution of Civil Engineers - Structures and Buildings, 2005
An experimental study on the seismic response of cold-formed steel tubular members functioning as... more An experimental study on the seismic response of cold-formed steel tubular members functioning as bracing members in concentrically braced frames is described. A number of shake table tests were carried out to examine member and storey performance under earthquake loads. Three different square and rectangular hollow cross-sections were utilised for the bracing members. It is shown that maximum brace tensile forces can be over 30% higher than those estimated using the actual yield strength, due to strain hardening and strain rate effects. Moreover, the experimental storey shear can exceed that predicted by design procedures by more than 50%. The tests also indicate that the ductility demand under seismic loading can be estimated reasonably well for the frame models using a conventional equal-energy idealisation. In addition, the results illustrate generally satisfactory performance for braces with member slenderness exceeding typical limits in seismic codes.
It is not certain that a historical and monumental building that sustained successfully the effec... more It is not certain that a historical and monumental building that sustained successfully the effects of previous earthquakes will endure the forthcoming ones. In most cases, previous earthquakes have already caused minor or major non-structural or structural damage. The accumulation of this damage may severely affect the antiseismic performance to a future earthquake with larger acceleration, velocity and displacement values and its effects especially when other damaging factors including physicochemical decay of structural settlements, differential settlements, possible fires among others, have caused further reduction of the bearing capacity of the building. Thus, the need for the preservation of historical and monumental buildings and their strengthening against seismic risk and related damage is evident and crucial. All methods and techniques of preservation and strengthening should be applied to these structures with the least possible alteration of their form. Besides the prese...
Earthquakes have demonstrated the vulnerability of buried pipelines, mainly to 'non-dynamic&#... more Earthquakes have demonstrated the vulnerability of buried pipelines, mainly to 'non-dynamic' seismic deformations of the ground, such as liquefaction, landslide and fault movement. This paper presents an analysis procedure that is applicable to both horizontal and vertical fault movement, either for strike slip or reverse strike slip fault. Modifications to an existing computer code have been made so that it includes the previously mentioned parameters, taking also into consideration the severe reduction of the flexural stiffness of the pipe due to large axial forces that appear. Numerous parametric solutions are presented, commented and compared to the results of other investigators.
Uploads
Papers by Panayotis Carydis