Seismic Behaviour of Space Structures

Investigations show that the seismic behaviour of space structures may fundamentally differ from the conventional structures. This paper presents the results of dynamic analyses of double-layer barrel vaults with different configurations and support conditions subjected to a severe earthquake, and highlights some basic influential elements in seismic performance of the space structures. The effect of higher modes of vibration has been examined. The significance of the presence of snow loads on dynamic characteristics and seismic performance of space structures is emphasized. Various hysteresis models were used, and the effects of strength reduction and energy dissipation in compression struts were investigated. The results generally indicate that the induced seismic forces are enormously larger than the conventional seismic forces. The consequences of this finding on seismic design of space structures have been discussed, and remedial suggestions have been proposed.