Abstract
Dynamic interaction between equipment and its supporting structure may occur in some complex industrial structures such as blast furnaces, chemical reactor vesels, towers, or stacks, among others. The base shear distribution between the equipment and its supporting structure should be, therefore, dete mined considering the effects of dynamic interaction. One of the authors presented a reasonable base shear distribution via statistical response analysis using the random vibration theory. This result is useful for the elastic allowable stress design of these combined structures ; however, in order to provide a safety margin against large earthquakes, the ductility requirement of structural elements should be examined by analyzing the elastic-plastic response of the combined structures. With this background, this paper aims to clarify the elastic-plastic maximum responses of two main structural elements, the intermediate spring and the supporting frame itself. A total of 30 artificial earthquakes which have a power spectrum similar to the average power spectrum of 15 actual earthquakes are used. The maximum ductility factor, the maximum cumulative ductility factor, and the dissipating energy of each of these two structural elements are examined to evaluate their ductility requirement when the yield strength ratio between them is changed. The damping effects on the maximum responses of the equipment by the plastic behaviors of its structural elements are also evaluated.
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