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Aseismic Design and Construction in Egnatia Odos

Συντάχθηκε από nisida στις . Καταχωρήθηκε στο αντισεισμική μηχανική, γεφυροποιϊα, Εγνατία Οδός, επιστημονικό υλικό, οδικοί άξονες, σήραγγες, τεχνικά έργα.

A special issue of the Hellenic Association for Earthquake Engineering related to the Seismic Design of major projects along the Egnatia Highway is now made available online

Title: Aseismic Design and Construction along the Egnatia Odos
Editor: A.J. Kappos
Size: 51MB
Type: PDF

Official Website of the Hellenic Association for Earthquake Engineering: www.eltam.gr

IBSBI Conference: Innovations On Bridges And Soil-Bridge Interaction, Athens, 2014

Συντάχθηκε από nisida στις . Καταχωρήθηκε στο Historic Bridges, αντισεισμική μηχανική, γεφυροποιϊα, συνέδρια.

The Hellenic Society of Bridges Study is pleased to announce the second IBSBI Conference, “Innovations On Bridges And Soil-Bridge Interaction” IBSBI 2014, which will be held in Athens on 16, 17 and 18 October 2014. During 2014 we will be celebrating the 3300 years of the construction of the oldest bridge in Europe, the Mycenaean Bridge of Kazarma.

CONFERENCE TOPICS
· Aesthetics and architecture of bridges
· Bridge monitoring
· Design methods
· Fabrication and construction
· High performance materials
· New materials and their application on bridges
· International codes on bridges and comparison-loadings
· Seismic behaviour
· Vehicle-bridge interaction
· Old bridges and maintenance
· Stone bridges
· Long-span bridges
· Special forms of bridges
· Floating bridges
· Pedestrian bridges
· Sky-bridges
· Geotechnical problems
· Soil-structure interaction
· Stability problems – types and analysis
· Auxiliary and connected sub-structures
· Prefabrication
· Erection
· Computational techniques
· Experimental research
· Isolation and damping systems
· Aeroelasticity

Impact and explosion problems
· Multi-hazard loading on bridges

CALL FOR ABSTRACTS

The Scientific Committee invites all participants wishing to contribute to the scientific program to submit an abstract for oral presentation. Abstracts must be submitted by the deadline, January 10, 2014, to the following e-mail address:ibsbi2014@ntua.gr . Abstracts received after this date will not be considered.

Selected papers of high quality will be considered for publication in an extended form in the new International Journal IJBE after invitation ( http://www.ijbe.net/ ).

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Eurocode 8 Worked Examples

Συντάχθηκε από nisida στις . Καταχωρήθηκε στο english, Eurocode, Eurocodes, Joint Research Centre, αντισεισμική μηχανική, επιστημονικό υλικό, Ευρωκώδικας.

Excellent report by the Joint Research Center on various aspects of Eurocode 8 application inclussive of illustrative worked examples. Download
A complete list of Eurocode-related publications and presentations can be found here

NEES@Illinois MUST-SIM Facility’s Physical Test & Hybrid Simulation

Συντάχθηκε από nisida στις . Καταχωρήθηκε στο Earthquake engineering, Illinois, Simulation, αντισεισμική μηχανική, εφαρμογές πληροφορικής (ICT), πειραματική μηχανική.

The primary objective of the NEES@Illinois facility is to create a physical-analytical simulation environment whereby multi-axial, full-scale structure-foundation-soil systems can be subjected to complex loading and boundary conditions representing earthquake ground motion. Actions and responses are captured by state-of-the-art instrumentation and are processed and visualized using software developed by the site.
The major physical components of the facility are the reaction structure and the loading and boundary condition boxes, or LBCBs. Each LBCB is a self-reacting assembly of actuators, swivel joints, and control software capable of imposing any combination of six actions (forces and moments) and six deformations (displacements and rotations) on specimens connected to the loading platforms of the LBCBs. The site has three (3) large LBCBs, which can be used separately or in combination. When used together the LBCBs can be controlled independently, or they can be controlled to act as a single LBCB with increased load capacity. One of the key attributes of the MUST-SIM facility is that the LBCBs may be reconfigured to accommodate a vast array of testing needs. Examples of past tests and specifications of the test equipment will be presented during the webinar.

In addition to the full-scale facility, the NEES@Illinois site has a fully-operational, 1/5th-scale version of the MUST-SIM laboratory. This facility provides a realistic pre-test environment and serves as an education and outreach facility, but has also proven to be a worthy research facility in its own right.

Beyond the hardware aspects of the laboratory, NEES@Illinois has also developed the control systems and data acquisition systems used in the MUST-SIM. These systems will be covered in detail.

Hybrid simulation offers the most realistic testing to mimic actual system responses and NEES@Illinois is at the forefront of this area of research. 3-D hybrid simulation using UI-SimCor, a simulation coordinator developed at NEES@Illinois, will also be discussed.

YouTube Channel: http://www.youtube.com/user/NEESATUIUC?feature=watch


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Probabilistic Seismic Hazard Assessment through geometrically non-linear back-analysis of Byzantine and Roman Monuments

Συντάχθηκε από nisida στις . Καταχωρήθηκε στο abaqus, english, rocking, seismic hazard, Video, αντισεισμική μηχανική, μνημεία.

This paper aims at developing the tools and strategy for assessing the seismic performance of the Byzantine and Roman remains in the city of Thessaloniki, in Greece, as a means to back-evaluate and enrich the seismic microzonation studies available for the Metropololitan area. At first, focus is made on the Walls that have been constructed at the end of the 4th century A.D. in the reign of Theodosius the Great and numerous blocks remain intact widespread within the city grid. The study particularly focuses on a specific Wall residuum, whose small dimensions, simple morpholgy (free-standing, rocking dominated masonry block), availability of nearby strong ground motion recordings and good knowledge of the underlying soil conditions, constitute a well-controlled case-study with the minimum possible numerical modeling (i.e., epistemic), record-to-record and material uncertainty. Secondly, the study focuses on an ancient Roman column, which was reestablished in 1969 after extensive archeological works. For both historical structures, a refined probabilistic dynamic analysis approach is adopted and the structural performance is examined, through a Monte Carlo Simulation scheme, for a number of realistic earthquake scenarios, accounting for geometric nonlinearities (i.e., sliding and rocking) and uncertainties in friction properties. Given the absence of damage, permanent displacement or collapse of the particular bodies, the probability of non-exceedance of a specific intensity measures (for the period that the structures remain intact) is assessed for the Wall residuum and the ancient colonnade, thus implicitly, for the city as a whole. It is also demonstrated that the fragility predicted without dully considering rocking and sliding of the two rigid blocks may lead to misleading results for particular sets of strong ground motions.

Sextos AG, Nalmpantis S, Faraonis P, et al. (2013) Probabilistic seismic hazard assessment through geometrically non-linear back-analysis of Byzantine and Roman Monuments. 10th HSTAM International Congress on Mechanics. Chania, Crete, Greece.

Youtube Video

Seismic Strengthening of Hospitals

Συντάχθηκε από nisida στις . Καταχωρήθηκε στο english, αντισεισμική μηχανική.

By NISEE
Hospital reconstruction and seismic strengthening provided continuous demand for construction design and engineering services in recent years. (See NISEE, Dec 9, 2011) In California, compliance with mandatory seismic performance objectives for critical health care facilities is largely supervised through the California Office of Statewide Planning and Development (OSPD). A hospital’s ability to function adequately after a large earthquake is dependent on the building’s structural components (a building’s primary load carrying system of foundation, columns, beams, floors, walls and roof), non-structural components (building elements such as ceilings, partitions, pipes, mechanical and electrical, that are not part of the structural load-bearing system), occupants (staff and patients) and contents (equipment, supplies, furnishings, etc.) remaining largely undamaged. Hospital serviceability after natural disaster relies on robust interconnectedness of lifeline systems (water, power, transportation, etc.) that support hospital services. The constitution of structural, non-structural and contents may provide unique seismic strengthening challenges for hospitals.


For seismic strengthening of modern hospital buildings, reliable site-specific loss estimation techniques (e.g.: Blume-157) can account for structural and non-structural damage. Engineering building codes (e.g.:ICBO, FEMA, California Building Codes), applied research programs (e.g.: ATC-58, MCEER, Japan E-Defense) and sophisticated testing methodologies to analyze and strengthen structural and many non-structural systems to resist moderate to strong earthquake shaking or geotechnical damage are reasonably advanced. Video of recent shake-table testing at the University of California, San Diego (‘Building it Better: Earthquake-Resilient Hospitals for the Future’) confirms some ability to achieve both structural and non-structural hospital resilience after credible earthquakes in California. 


Read more / Original Source

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A Brief History Of The Richter Scale

Συντάχθηκε από nisida στις . Καταχωρήθηκε στο english, αντισεισμική μηχανική.


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The California-Made Earthquake Alarm That Works But California Won’t Build

Συντάχθηκε από nisida στις . Καταχωρήθηκε στο αντισεισμική μηχανική, εφαρμογές πληροφορικής (ICT).

Source blog 

For all of the devastation caused by the 2011 earthquake/tsunami in Japan, the former, a 9.0 magnitude beast called “Tohoku,” could have claimed far more lives. The reason it didn’t? Since 2007, Japan has had an early warning system — conceived 10 years ago at Caltech — which California still hasn’t managed to set up. And while it only gives about a minute notice, it’s a minute Californians currently don’t have.
Until 2003, when Japanese seismologist Hiroo Kanamori and UC Berkeley’s Richard Allen published a study proving that early detection was possible, warning systems for earthquakes have relied on a concept that’s been around since the 19th century: detect the ground shaking at the fault line and send advanced notice to cities miles away through telegraphs, telephones, or modern telecommunications (depending on which century you’re in).
This system relies on the fact that electronic signals move much faster than seismic waves; For example, if you were in New York and on Twitter on August 23, 2011, you might have seen tweets from Washington DC about their earthquake just before the ground started shaking under your feet. As neat as that might have been (yay, new media!) retweeting is not a very good system for warning a city of impending seismic doom.
The new system put into place in Japan in 2007 detects earthquakes before they start shaking the Earth’s surface. Allen and Kanamori found that when tectonic plates shift, they release two forms of energy simultaneously, called p-waves and s-waves. S-waves cause all the damage on the surface. P-waves are harmless, but travel through the ground about twice as fast. So when Japan’s more than 1000 seismometers near their Pacific fault-line relayed p-wave data indicating a massive earthquake, the Japanese Meteorological Agency rang the alarm.
While this “early detection” still only gives about 60 seconds of warning, Japan was able to safely stop 11 500km/h bullet trains, disable 16,000 lifts, warn students to get under their desks and set off earthquake alarms across the country. Some 52 million Japanese received text alerts on their mobile phones. But that’s because Japan has the advanced warning system and a cultural awareness of the threat of earthquakes (for example, new iPhones bought in Japan come with quake-warning features built in).
California, on the other hand? Azeen Ghorayshi, in a great feature for the East Bay Express about Japan and California’s preparedness, says that California still has “next to nothing in terms of a public seismic warning system,” despite knowing how to build one for almost a decade and despite knowing the next “big one” is only matter of time. But building a statewide system is only a matter of politics and money, so it’ll probably be ready in no time. Meanwhile, here’s a $1 iPhone Seismometer app that you can make into your own DIY not-so-advanced warning system. [East Bay Express]

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Fukushima Earthquake (11/3/2011) documentary

Συντάχθηκε από nisida στις . Καταχωρήθηκε στο Video, αντισεισμική μηχανική, σεισμοί.

Ντοκιμαντέρ του ΣΚΑΪ καταγράφει μέσα από συγκλονιστικές εικόνες τον σεισμό των 9 Ρίχτερ, το τσουνάμι και την πυρηνική καταστροφή στην Φουκουσίμα της Ιαπωνίας. Αυτόπτες μάρτυρες αλλά και επιστήμονες που βίωσαν και μελετούν αντίστοιχα αυτό το σεισμό και τις συνέπειες που προκλήθηκαν στην Ιαπωνία μιλούν στην κάμερα. Τα 9 Ρίχτερ που χτύπησαν την Ιαπωνία την Παρασκευή 11 Μαρτίου 2011 αποτέλεσαν τον πέμπτο μεγαλύτερο σεισμό που έχει καταγραφεί στον κόσμο από το 1900. Το τσουνάμι που ακολούθησε έφερε και τις εφιαλτικές συνέπειες των 10.000 και πλέον νεκρών αλλά και χιλιάδων αγνοουμένων. Ολόκληρες πόλεις χάθηκαν και τίποτα δεν είναι πια ίδιο για τους Ιάπωνες αλλά και ολόκληρο τον κόσμο μετά την καταστροφή που υπέστη το πυρηνικό εργοστάσιο της Φουκουσίμα

International Conf. on Earthquake Geotechnical Engineering: From Case History to Practice • In honour of Prof. Kenji Ishihara

Συντάχθηκε από nisida στις . Καταχωρήθηκε στο english, αντισεισμική μηχανική, γεωτεχνική σεισμική μηχανική, συνέδρια.

The ISSMGE Technical Committee (TC 203) on “Earthquake Geotechnical Engineering and Associated Problems” organizes the International Conference on Earthquake Geotechnical Engineering From Case History to Practice in honor of Prof. Kenji Ishihara to be organized in Istanbul, Turkey during 17-19 June, 2013. Scope and topics include:
• Case histories on ground motion and site effects
• Soil investigation with field and laboratory testing
• Dynamic Characterisation and modelling
• Performance based design methodologies; Soil-structure interaction
• Physical modelling by shaking table and centrifuge tests
• Liquefaction; Lateral spreading
• Slope stability; Embankments, landfills and dams
• Shallow foundations; Pile foundations
• Retaining wall; Reinforced earth; Underground structures
More info: http://www.icege2013.org/