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EPICentre Seminars - State-dependent fragility for ground motion sequences traditional vs innovative

18 November 2020, 12:00 pm–1:00 pm

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This seminar will look at a framework to derive state-dependent fragility relationship of structures subjected to ground-motion sequences, such as mainshock-aftershock or triggered earthquakes.

This event is free.

Event Information

Open to

All

Cost

Free

Organiser

Arash Nassirpour – UCL EPICentre / Department of Civil, Environmental & Geomatic Engineering

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A framework to derive state-dependent fragility relationship of structures subjected to ground-motion sequences (e.g. mainshock-aftershock or triggered earthquakes) is proposed. The hysteretic energy dissipated in the sequence is adopted as the main demand parameter, since it is a cumulative measure monotonically increasing with the length of the excitation. Based on theoretical considerations, the hysteretic energy-peak deformation trend is discussed, highlighting that:
1) the significant duration of the ground motion explains the variability of the hysteretic energy for a given peak deformation;
2) in the aftershock, a structure dissipates less energy (for a given aftershock peak displacement) if the peak displacement in the mainshock is higher. A vector-valued probabilistic seismic demand model consistent with these considerations is proposed in the form of a surface relating the hysteretic energy in the sequence to the peak deformation in the mainshock and a ground-motion intensity measure of the aftershock. 
The results show the feasibility of the proposed approach, effectively capturing damage accumulation without inconsistencies in the obtained statistical model. 
 

Click Here to Join the Seminar via Zoom

Please note that the session and chat function may be recorded and retained as per UCL’s retention schedule.
Photo Credit: A local resident watches as rescue teams search for survivors in the debris of a collapsed building in Izmir, Turkey, Oct. 31, 2020. (AP Photo)

About the Speakers

Dr Roberto Gentile

Marie Curie Senior Research Fellow at EPICentre / UCL CEGE

I am a Marie Curie Senior Research Fellow at UCL (University College London). My main research interests focus on building frameworks for the design and analysis of earthquake risk reduction strategies. I am currently working at a multi-criteria decision making algorithm defining the optimal compromise among structural retrofit/strengthening, tax rebates from the government and insurance to reduce earthquake risk for individual reinforced concrete buildings or portfolios.
www.robertogentile.org 

Karim Aljawhari

PhD Researcher at Istituto Universitario di Studi Superiori, Pavia