GEER field mission report on the Italian earthquake of 24/8/16
Version 2.0 of the GEER field mission report on the Italian earthquake
of 24/8/16. Mission led by Prof. Jonathan Stewart, UCLA. More info: http://tinyurl.com/gmf6v3a
Tag: Earthquake
Abaqus Tutorial: steel truss pedestrian bridge
Simulation of a steel truss pedestrian bridge with ABAQUS/Simulia Finite Element Software
Video available here: https://youtu.be/EOONdIHUTf8
Reconnaissance report on the dual Cephalonia Earthquake
Two major earthquakes with Mw = 6.0 and Mw = 6.1 hit the Cephalonia Island of Greece on January 26th and February 3rd of 2014, respectively.The reconnaissance mission was unique in two ways: First, it brought together the local, highly qualified earthquake engineering community, with a US collaborative team of GEER, EERI, and ATC to form a 70-people multidisciplinary team. Second, the resiliency of building stock, geostructures, and communities that responded successfully to one of the strongest sequence of ground motions ever recorded in Europe provided the opportunity to focus on collecting data of successful performance in addition to failures – a new generation of reconnaissance.
The reconnaissance report (Version 1) is available at www.geerassociation.org/GEER_
with observations on: (i) seismological and recorded motions; (ii) geotechnical aspects; (iii) rigid blocks behavior; (iv) structural response; (v) infrastructure lifelines; (vi) nonstructural components response; and (v) economical and societal aspects.
Correlation of pre- and post-earthquake assessment of public buildings during the 2014 Cephalonia Earthquake
Presentation made during the Workshop about Cephalonia Earthquake jointly organised by the Society of Civil Engineers, the Hellenic Association for Earthquake Engineering, the Greek branch of the International Association for Bridge and Structural Engineering and the Organisation for Earthquake Protection and Planning.
Presentation available in YouTube:
Kefalonia Earthquake: list of information resources
Constantly updated Web Info Point:
Event sequence
- Daily maps of Seismic Events
- Real time Seismicity in Greece
- Latest announcements of the National Observatory of Athens
Recorded Ground motions
Response Spectra
Photos & Videos
Structural damage
Technical Reports
Strong earthquake magnitude Ms=6.2 near Chania, Crete
Date / Time, Oct 12 4:11 PM local time, Focal Depth: 50 km, GEO: Longitude 23.330, GEO: Latitude 35.530, 65km West of Chania
Magnitude Ms = 6.2
Source: EMSC EARTHQUAKE-REPORT.COM
Help Map Damage from the Gansu Earthquake
After the Christchurch earthquake, a new initiative has been undertaken to mobilize the engineering community to quickly trace damage visually based on high resolution Google Earth maps. This volunteer work helps the authorities identify quickly on the areas of highest earthquake impact and manage the recovery and reconnaissance activities. This time Tomnod, the web-based tool used for for this purpose has initiated a campaign to help identify the impact of the two powerful earthquakes that have struck China’s north-west Gansu province, killing at least 75 people and leaving more than 400 others injured.
In my opinion this initiative is quite premature so far while the subjectivity of the visualization by individual volunteers increases the uncertainty of the macroscopic assessment. However, the large number of the people involved may somehow smooth the assessment discrepancy and provide some basic trends regarding the areas most heavily hit, a fact that is of paramount importance particularly in extended remote areas such as the Chinese provinces. I think it is worth giving it a try by connecting to the digital images here. Even the idea of contributing to human relief from the comfort of your office or home is quite rewarding.
Magnitude 6 earthquake, Crete, Greece
Very Strong earthquake to the South of Crete, Greece
Magnitude 5.9 earthquake rattled Crete at 19:11pm local time. Epicenter was located 143km south of the city of Ierapetra. Focal depth estimate of 14km.
More: Institute of Geodynamics
Earthquake Engineering Special Session organized with the framework of Fourteenth International Conference on Civil, Structural and Environmental Engineering Computing
An “Earthquake Engineering” Special Session is organized within the framework of Fourteenth International Conference on Civil, Structural and Environmental Engineering Computing, to be held in Cagliari, Sardinia, Italy between 3-6 September 2013. It is organized by Anastasios Sextos, Assistant Professor at Aristotle University of Thessaloniki.
The Special Session focuses on recent advances in Computational Earthquake Engineering and Structural Dynamics. More specifically, it will encourage contributions related to the mitigation of seismic risk, the design and assessment of
earthquake resistant buildings and bridges, the assessment of
special and monumental structures, system identification and structural health
monitoring, performance-based engineering, seismic
isolation and control of structures, dynamic soil-structure
interaction, strong ground motion selection and scaling as well as
seismic wave propagation through the soil media. Papers related to new
software applications, web-based engineering tools, frameworks for
hybrid simulation and distributed computing, knowledge-based & expert
systems, finite
element programs, numerical analysis pre- and post- processing
front-ends, data and metadata dissemination and management
systems, high performance, parallel and cloud computing schemes,
applications for mobile devices and tablets as well as GIS-based
visualization tools are also welcome.
It is envisioned that the Special Session will constitute an interesting forum for scientists using state-of-the-art computational methods and tools for Earthquake Engineering purposes.
Please note that the call for papers closes on the 5th December 2012 and abstracts may be submitted via the conference website: http://www.civil-comp.com/conf/
To encourage young researchers to attend the conference a 1000 Euro Young Researcher Best Paper Prize will be awarded to the best paper presented at each of the conferences. (For further details please see the conference website).
Real-time Hybrid Simulations of a Large-scale Steel Structure with Nonlinear Viscous Dampers
The
NEESR project entitled NEESR-CR: Performance-Based Design for
Cost-Effective Seismic Hazard Mitigation in New Buildings Using
Supplemental Passive Damper Systems (PI: Richard Sause) is currently
conducting a series of large-scale real-time hybrid simulations (RTHS)
on a 3-story steel frame building at the Real-time Multi-directional
(RTMD) Earthquake Simulation Facility, the Lehigh NEES Equipment Site.
The goal for this NEESR project is to develop
a validated, probabilistic, performance-based seismic design procedure
for buildings with passive damping systems.The
RTHS data will be used to observe and understand the interactions of
the viscous dampers with the braces, beams, and columns of the
experimental substructure as well as the interactions
between the steel frame with the dampers and the rest of the building.
The project team has developed detailed analytical (numerical
simulation) models of the prototype building with nonlinear viscous
dampers, and the RTHS data will be used to validate the
models. RTHS
will take place February 21 – 22, 2013 between 1 and 4 pm EST. The RTHS
test matrix includes conducting a series of simulations using an
ensemble of 13 earthquake records at the design
basis earthquake (DBE) level. The RTHS can be viewed by telepresence,
where webcams and the Real-Time Data Viewer can be used to view video,
data and animation of the response of the building acquired from the
RTHS. To learn more or to remotely participate,
go to the following link (http://www.nees.lehigh.edu/rths-of-mrf-dbf-system-with-viscous-dampers). Result (including video) from completed tests will also be archived and
available at the previous link and through the Project Warehouse on NEES.org. Also,
follow us on Facebook to get up to the minute simulation updates from our
research team.
The
project is a collaborative effort that includes California State
University, Northridge; California State Polytechnic University, Pomoma;
Lehigh University; The Pennsylvania State University,
Erie; and Tokyo Institute of Technology. Industry partners include
Corry Rubber Company, Taylor Devices, Miyamoto International, Inc. and
Simpson Gumpertz & Heger. More information about the above NEESR project can be found
here. You are encouraged to visit the
RTMD website to learn about the capabilities of the Lehigh NEES Equipment Site and completed and
ongoing research projects. Data can be accessed at NEEShub for the
completed projects.
Earthquake Damage Database
The Earthquake Damage Database has been launched, featuring a visual and fully searchable catalogue of structural damage due to earthquake loading in Greece. The database contains more than 300 photos with seismic-related metadata, georeference (where availlable) and commentary and aims to act as a visual educational tool for undergraduate and young Civil Engineers. Currently it is available only in Greek.
Official Website: http://asptetk.civil.auth.gr/Pages/Home.aspx
For further info or in case you are interested to submit your earthquake damage-related photos please contact: asextos@civil.auth.gr
L’Aquila sentence: Press Release of the Hellenic Association for Earthquake Engineering
PRESS RELEASE
=============
It is with
great regret that we have been informed about the primary conviction of
seven Italian scientists, considered responsible for the loss of human life
during the recent earthquake in L’Aquila. With deepest respect for each and
every human life lost due to this natural disaster, the Hellenic Society for
Earthquake Engineering, would like to note the following:
– It is
commonly accepted within the scientific community worldwide, that there cannot
be a short-term prediction of earthquakes, nor can it be an accurate
determination of the space, time and intensity of a future seismic event. For
this reason, it is practically impossible to take any essential precaution
measures for the protection of citizens in an area that is sufficiently narrow
and within a reasonably short period of time. Citizens and the State ought to
know the limits of scientific knowledge and to accept the large uncertainties
associated with the prediction of seismic activity, which is unfortunately
still impossible to overcome. From a scientific point of view and in accordance
with all international guidelines and state-of-practice, the Italian colleagues
acted as any other scientist would have in a similar position.
commonly accepted within the scientific community worldwide, that there cannot
be a short-term prediction of earthquakes, nor can it be an accurate
determination of the space, time and intensity of a future seismic event. For
this reason, it is practically impossible to take any essential precaution
measures for the protection of citizens in an area that is sufficiently narrow
and within a reasonably short period of time. Citizens and the State ought to
know the limits of scientific knowledge and to accept the large uncertainties
associated with the prediction of seismic activity, which is unfortunately
still impossible to overcome. From a scientific point of view and in accordance
with all international guidelines and state-of-practice, the Italian colleagues
acted as any other scientist would have in a similar position.
– The
criminalization of the inherent scientific inability to exceed the current
state of knowledge, is not only unjust for the persons in charge of the Italian
National Commission for the Forecast and Prevention of Major Risks, who have
contributed at a great extent in the mitigation of seismic risk. It is expected
to inactivate all relevant Civil Protection Departments in Italy and worldwide,
which will be reluctant to act in the future based on actual data. This phobic
crisis management may also result into a seriously misleading assessment of the
probabilistic nature of seismic hazard. This fact alone may have severe
consequences on the economic and social life of all regions exposed to seismic
risk internationally. Most importantly, it raises serious questions regarding
the way in which the State and society view the scientific progress as a whole.
criminalization of the inherent scientific inability to exceed the current
state of knowledge, is not only unjust for the persons in charge of the Italian
National Commission for the Forecast and Prevention of Major Risks, who have
contributed at a great extent in the mitigation of seismic risk. It is expected
to inactivate all relevant Civil Protection Departments in Italy and worldwide,
which will be reluctant to act in the future based on actual data. This phobic
crisis management may also result into a seriously misleading assessment of the
probabilistic nature of seismic hazard. This fact alone may have severe
consequences on the economic and social life of all regions exposed to seismic
risk internationally. Most importantly, it raises serious questions regarding
the way in which the State and society view the scientific progress as a whole.
Based on
the above, we would like to express the full and unreserved support of the
Hellenic Department of Earthquake Engineering to the convicted colleagues. We
do hope that the Italian Authorities will beneficially assess the validity of
our allegations.
the above, we would like to express the full and unreserved support of the
Hellenic Department of Earthquake Engineering to the convicted colleagues. We
do hope that the Italian Authorities will beneficially assess the validity of
our allegations.
Prof.
Kyriazis Pitilakis
Kyriazis Pitilakis
Chairman
of the HSEE
of the HSEE
Assist. Prof. Anastasios Sextos
Secretary of HSEE
HELLENICSOCIETYfor EARTHQUAKEENGINEERING [ HSEE ]
MemberoftheΙinternationalAssociationforEarthquakeEngineering
Seventh National Seismic Conference on Bridges & Highways (7NSC) “Bridge Resilience for Earthquakes and Other Natural Hazards”
Oakland,
California has been selected as the site of the Seventh National
Seismic Conference on Bridges & Highways (7NSC). The event will be
held May 20-22, 2013 at the Oakland Marriott City Center. The conference
theme is “Bridge Resilience for Earthquakes and Other Natural Hazards,”
indicating a broad scope. There will be presentations and discussions
of multiple hazards that may affect the performance of highway
infrastructure. California was chosen by the Federal Highway
Administration (FHWA) to host this conference based on the state’s past
experience with earthquakes and the Department of Transportation’s
(Caltrans) leadership in the field. D2BS98J4TVJZ
California has been selected as the site of the Seventh National
Seismic Conference on Bridges & Highways (7NSC). The event will be
held May 20-22, 2013 at the Oakland Marriott City Center. The conference
theme is “Bridge Resilience for Earthquakes and Other Natural Hazards,”
indicating a broad scope. There will be presentations and discussions
of multiple hazards that may affect the performance of highway
infrastructure. California was chosen by the Federal Highway
Administration (FHWA) to host this conference based on the state’s past
experience with earthquakes and the Department of Transportation’s
(Caltrans) leadership in the field. D2BS98J4TVJZ
Co-organizers
of the conference are USDOT Federal Highway Administration,
Transportation Research Board, American Association of State Highway and
Transportation Officials’ Subcommittee on Bridges and Structures
(AASHTO), and earthquake research centers PEER-UC Berkeley, and MCEER,
University at Buffalo.
of the conference are USDOT Federal Highway Administration,
Transportation Research Board, American Association of State Highway and
Transportation Officials’ Subcommittee on Bridges and Structures
(AASHTO), and earthquake research centers PEER-UC Berkeley, and MCEER,
University at Buffalo.
The
2013 conference builds upon previous successful meetings that have been
held in San Diego, Sacramento, Portland, Memphis, San Mateo, and
Charleston, SC. Based on past trends, attendance is expected to exceed
400 and will include representatives from private engineering practice,
government, construction, academia, and industry. This conference is a
premier gathering of transportation officials responsible for addressing
and mitigating the impact of all hazards on our highway infrastructure.
2013 conference builds upon previous successful meetings that have been
held in San Diego, Sacramento, Portland, Memphis, San Mateo, and
Charleston, SC. Based on past trends, attendance is expected to exceed
400 and will include representatives from private engineering practice,
government, construction, academia, and industry. This conference is a
premier gathering of transportation officials responsible for addressing
and mitigating the impact of all hazards on our highway infrastructure.
On
Sunday May 19, 2013, an optional pre-conference technical workshop will
be held. The main program will be held over the next 2½ days with over
75 oral and poster presentations, discussion panels, and a student
design competition. Several internationally renowned keynote speakers
are being invited to share information about some of the major
earthquakes that have occurred in other parts of the world in recent
years. In addition, a special session is planned that will highlight the
design and construction of the soon to be complete San Francisco –
Oakland Bay Bridge, with emphasis on the unique self-anchored suspension
span. An optional technical tour will also be provided.
Sunday May 19, 2013, an optional pre-conference technical workshop will
be held. The main program will be held over the next 2½ days with over
75 oral and poster presentations, discussion panels, and a student
design competition. Several internationally renowned keynote speakers
are being invited to share information about some of the major
earthquakes that have occurred in other parts of the world in recent
years. In addition, a special session is planned that will highlight the
design and construction of the soon to be complete San Francisco –
Oakland Bay Bridge, with emphasis on the unique self-anchored suspension
span. An optional technical tour will also be provided.
In
the days prior to the 7NSC, FHWA is planning to hold the First
International Bridge Seismic Workshop, also in Oakland. Dr. W. Phillip
Yen, FHWA Principal Bridge Engineer – Structural Dynamics, is Chairman
of the 7NSC and the International Workshop.
the days prior to the 7NSC, FHWA is planning to hold the First
International Bridge Seismic Workshop, also in Oakland. Dr. W. Phillip
Yen, FHWA Principal Bridge Engineer – Structural Dynamics, is Chairman
of the 7NSC and the International Workshop.
For more information, visit the conference web site.
Ground motion and Tsunami induced damage on structures due to the great East Japan earthquake and tsunami of March 11, 2011.
15WCEE Seminar Series: Professor K. Kawashima on “Ground motion and Tsunami induced damage on structures due to the great
East Japan earthquake and tsunami of March 11, 2011. Emphasis on damage
in bridge structures.”
Seminar tool place in March 2012.
Rare shot of tall buildings vibrating due to the Japan earthquake
Rare shot of tall buildings vibrating due to the Japan earthquake. When sometimes is better to align with the nature’s forces instead of resisting them.. [click ‘Read more’ to view the video]