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Control devices and control systems
Published in You-Lin Xu, Jia He, Smart Civil Structures, 2017
Seismic base isolation is a technique that mitigates the effects of an earthquake using a flexible base composed of a specific material with low lateral stiffness that filters out the energy of high frequencies from potentially dangerous ground motion. Since low- and medium-rise building structures are of relatively high frequencies, base isolation devices are designed to provide seismic protection for these types of buildings in an effective manner. The basic goal of such devices is to prevent the superstructure from absorbing earthquake energy so that the structural responses, including accelerations and inter-story drifts, will be significantly reduced. Earthquake protection of structures using the base isolation technique is generally suitable if the following conditions are fulfilled (Deb 2004): The subsoil does not produce a predominance of long period ground motion.The structure is fairly squat with sufficiently high column load.The site permits horizontal displacements at the base of the order of 200 mm or more.Lateral loads due to wind are less than approximately 10% of the weight of the structure.
“Smart” base isolation systems: Theory and experiments
Published in B.F. Spencer, Y.X. Hu, Earthquake Engineering Frontiers in the New Millennium, 2017
B.F. Spencer, H. Yoshioka, J.C. Ramallo, E.A. Johnson
One of the most widely implemented and accepted seismic protection systems is base isolation. Seismic base isolation (Skinner et al. 1993, Naeim and Kelly 1999) is a technique that mitigates the effects of an earthquake by essentially detaching the structure and its contents from potentially dangerous ground motion, especially in the frequency range where the building is most affected. The goal is to simultaneously reduce interstory drifts and floor accelerations to limit or avoid damage, not only to the structure but also to its contents, in a cost-effective manner.
To Investigate Different Parameters of Economic Sliding Based Seismic Isolation System
Published in Journal of Earthquake Engineering, 2023
Tayyaba Bibi, Amir Ali, Akhtar Naeem, Chunwei Zhang, Naveed Ahmad
The main objective of seismic base isolation is to introduce such components at the base of a building, which is horizontally flexible but vertically stiff. This setup uncouples the super-structure from high-frequency shaking earthquakes. Seismic base isolation increases the natural time period of the structure that causes a reduction in force demand on the structure due to a reduction in acceleration. An efficient isolation system is one that reduces the amount of energy that is transferred to the structure by dissipating it through energy dissipation mechanisms within the system. A seismic isolation system shifts the displacement demand from the superstructure to the isolation system. Another phenomenon associated with seismic isolation is damping which is the reduction in the amplitude of oscillation (Zhang and Ali 2021).
Multi-Directional Base Isolation System for Coupled Horizontal and Vertical Seismic Excitations
Published in Journal of Earthquake Engineering, 2022
Mohammad Masoud Pourmasoud, James B. P. Lim, Iman Hajirasouliha, Daniel McCrum
Seismic base isolation systems are mainly used to reduce the distributed acceleration in the superstructure floors as an indication of damage rate to the non-structural elements and appliances of stories (FEMA 2003; Kitayama et al. 2017).