The Base Isolated Mass of the Dynamic Laboratory at University of Naples Federico II

Abstract eng:
A base isolated system for the reaction mass of two 3x3m movable shaking tables was designed and built to perform experimental tests on large scale structures, especially subjected to asynchronous earthquake ground motion. Such reaction mass, built in the laboratory of the Department of Structural Engineering at University of Naples Federico II in Italy, is part of major works in progress to upgrade the testing facility and allow for full use of system of shake tables. The adopted isolation system consists of about 100 air springs located at the base of about 1,400 tons ring-shaped mass and eight groups of eight dampers located at the edges of the above mass. To optimize the performance of the system, a reduction of the lateral displacement of the mass along with the accelerations transmitted to the foundation, was considered. The selection of the allowable lateral displacements of the large reaction mass was driven by the need to be compatible with the adjacent existing structure. In fact, the shaking tables were mounted on an existing strong floor in the laboratory of the university department. Several retrofitting interventions on the existing structures, e.g. the cutting of the existing columns and the use of special concrete for casting, were employed to achieve adequate structural performance under the working conditions of the shaking tables.

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