Seminars

This category contains seminars organised by, or otherwise affiliated with, SECED.

This EPICentre Seminar will be given by Professor Humberto Varum of Aveiro University.

Please note that this seminar is not organised by SECED. For more information, visit the EPICentre website

Event Date 16/11/2012 1:00 pm
Event End Date 16/11/2012 2:00 pm

We are no longer accepting registration for this event

The uplifting and rocking of slender, free-standing structures when subjected to ground shaking may limit appreciably the seismic moments and shears that develop at their base. While the high seismic performance of rocking isolation has been documented with the through-the-centuries survival of several free-standing ancient temples, it is only recently that rocking isolation starts to emerge as practical and attractive seismic design concept. Starting from the solitary free-standing column, the seminar uncovers the dynamics of the rocking frame – that is, an array of free-stranding columns capped with a freely supported rigid beam. Following a rigorous analysis, the seminar concludes with the remarkable result that the dynamic rocking response of the rocking frame is identical to the rocking response of a solitary free-standing column with the same slenderness yet with larger size – that is, a more stable configuration. Most importantly, the seminar shows that the heavier the freely supported cap beam is, the more stable is the rocking frame regardless of the rise of the centre of gravity of the cap beam, concluding that top-heavy rocking frames are more stable than when they are top-light. This ‘counter-intuitive’ finding renders rocking isolation a most attractive alternative for the seismic protection of bridges with tall piers; whereas, its potential implementation shall remove several of the concerns associated with the seismic connections of prefabricated bridges. The practice of increasing the lateral stiffness of the rocking frame with the use of unbonded vertical tendons is examined, and the seminar concludes that the concept of rocking isolation by intentionally designing a hinging mechanism is a unique seismic protection strategy for large, slender structures not just at the limit-state but also at the operational state.

Event Date 18/03/2015 6:00 pm

We are no longer accepting registration for this event

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