Study of wire rope devices for improving the re-centering capability of base isolated buildings

Abstract

Wire rope devices have found numerous applications in the shock and vibration isolation of industrial machinery and equipment. The aim of the work is to present a preliminary investigation of their usefulness as a mean to increase the re-centering capability of the isolation system of a civil structure. In the first part of the study, analytical formulations have been developed to predict the restoring stiffness of wire rope devices depending on their material and geometrical properties, and the direction of loading. In the second part, a preliminary assessment of wire rope springs has been performed based on unidirectional shake table tests on a scaled steel structure isolated with curved surface slider and either or not provided with wire rope springs. The changes in the seismic response of the isolation system are analyzed and some suggestions for improving the use of wire rope devices are drawn

Experimental characterisation and numerical modelling of axially loaded wire rope isolators

“…Introduction Wire Rope Isolators (WRIs) are widely used in controlling both vibration and shock in order to protect sensitive equipment in the areas of aerospace and mechanical engineering [1] as well as for seismic protection of buildings [2] and their contents/equipment [3]. These devices have also been used to reduce the seismic vibration in protecting high voltage ceramic circuit breakers [4] and to protect the two Riace bronzes towards vertical components of seismic ground motions [5,6].…”

Hybrid isolation system with wire‐rope isolators and magnetorheological dampers for the isolation of blast‐induced vibration

“…The WRI dissipates the input energy of the PI system primarily through dry friction between wire strands. [1][2][3][4][5][6] The stiffness-softening and damping characteristics of the WRI endow it with excellent isolation performance. Therefore, WRIs have been widely applied for practical isolation in the fields of aerospace engineering, building structures, and industrial production.…”

“…The WRI comprises stranded stainless steel in helical, spherical, or arch shapes, which are fixed to upper and lower clamps. The WRI dissipates the input energy of the PI system primarily through dry friction between wire strands 1–6 . The stiffness‐softening and damping characteristics of the WRI endow it with excellent isolation performance.…”

Case study of the seismic response of an extra‐dosed cable‐stayed bridge with cable‐sliding friction aseismic bearing using shake table tests

“…Yet, what is more commonly seen is a combination of sliding isolator and additional restraining device. Cables, including steel strands and steel wire ropes, are often used as additional seismic restrainers due to their high stability against chemical agents and extreme environmental factors . With the development of materials technology, in recent years, shape memory alloy (SMA) has been adopted to endow bridge with not only restraining but also significant self‐centering capability .…”