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Compared Effects of Earthquakes, Tsunamis and Aircraft Crashes on Base-isolated Massive Structures

Pierre Labbé1, 2

1. Electricité de France, Technical and Industrial Direction, Saint-Denis 93282, France

2. Université Paris-Est, Ecole Spéciale des Travaux Publics, Cachan 94234, France


Abstract: The purpose of this paper is to compare the respective effects of seismic ground motion, tsunami and aircraft crash on typical base-isolated massive structures. The seismic ground motion is represented by a conventional pseudo-acceleration response spectrum. Simple formulae are established for calculating the tsunami induced force as a function of the wave height and the response to this force. Similarly, formulae are established to calculate the response under aircraft crash, based on the mass and velocity of the aircraft. A key point is that base-isolated structures are designed at low eignenfrequencies (typically lower than one hertz). A consequence for the design of the base-isolation system is that the three considered types of events do not result in similar load types. For seismic ground motion, the key parameter for load characterization is the ground displacement (not the ground acceleration or associated inertia force); in the tsunami case it is the force applied by the wave on the structure, including a dynamic amplification effect, while in the aircraft crash case it is the momentum of the aircraft (mass x velocity).

Key words: Earthquake, ground motion, tsunami, aircraft crash, base-isolated structure.
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