C. Bucher, F. Weber, C. Braun:

"Displacement capacity of curved surface sliders: probabilistic design";

Talk: 16. D-A-CH Tagung Erdbebeningenieurwesen & Baudynamik, Innsbruck; 2019-09-26 - 2019-09-27; in: "16. D-A-CH Tagung", C. Adam, G. Achs, T Furtmüller (ed.); (2019), ISBN: 978-3-200-06454-6; 499 - 506.

Curved surface sliders are effective base isolators to reduce the seismic impact on civil structures. In the design of curved surface sliders two conflicting objectives exist. On the one hand, the goal is to reduce earthquake-induced shear forces and drifts in the structure, and, on the other hand, the displacement demand of the curved surface slider must be limited. The first objective is achieved by selecting a large effective radius combined with a rather small dynamic coefficient of friction. For the second objective it is crucial to consider that the displacement capacity, which is related to the size and therefore costs of the curved surface slider, must be greater than the maximum expected relative motion in the isolator due to the random nature of the isolatorīs relative motion. This paper describes a probabilistic procedure to efficiently compute the required displacement capacity of the curved surface slider based on the stochastic uncertainty of all parameters involved. The results reveal that the displacement capacity can be very well approximated by a simple design rule involving the structural period of vibration, the effective radius of curvature and the friction in the sliding surface.

Earthquake, Structural Dynamics, Base Isolation, Probabilistic Design

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