Abstract
Seismic isolation is effected by providing an interface between the foundations of the building and superstructure which may consist of stories above the ground level by inserting devices. Those are meant to reduce the effect of ground motions generated by an earthquake or/ and wind load. In this process, the period of the whole structure including base isolators is elongated so that ground waves containing large energy contents in the horizontal components of the earthquake may be deflected conveniently. An updated state-of-art review of isolation techniques and the design of isolated buildings is presented in this paper. The research findings in the comprehensive form are extracted out of the large volume of research papers published during the last five decades, where only some limited quality papers are selected for the preparation of this manuscript. The review generally covered papers on the analysis and design of structures with base isolation. Review is not confined to buildings with friction pendulum isolators only, but also includes the study of structural response to some other types of base isolators and dampers to seismic attacks.
Highlights
Considerable research work has been carried out during the last five decades in the field of earthquake engineering especially base isolation of structures
The objective of these reviews is the dissemination of knowledge among academia, scientific groups, and engineers who are involved in the design, implementation, and development of base isolation bearings in different types of structures throughout the world
The Friction Pendulum Systems (FPS) are robust types of equipment (Fig.3) that are used to reduce the effect of massive lateral forces on the superstructure caused by medium and high-intensity earthquakes
Summary
Considerable research work has been carried out during the last five decades in the field of earthquake engineering especially base isolation of structures. The Friction Pendulum (base isolator) Systems (FPS) are robust types of equipment (Fig.3) that are used to reduce the effect of massive lateral forces on the superstructure caused by medium and high-intensity earthquakes. Their basic purpose is to increase the fundamental period of the superstructure with the help of an increased radius of curvature of the FPS base isolator. In FP systems an articulated slider (Fig.3) is allowed to move on a curved surface whenever lateral forces due to earthquake exceed the predetermined threshold of the base isolator Zayas et al [44]; Al-Hussaini et al [3] It considerably reduces the shear force on the superstructure. Other prominent seismic isolators are the New Zealand bearing system (NZ bearings), Pure Friction (P.F), Resilient friction base isolation (R-FBI) system, and Electric De France system (EDF)
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