架構支持形装置の地震応答と水平力分担特性

抄録

Dynamic interaction between industrial equipment and its supporting frames during earthquakes should be taken into account for earthquake-resistant design of complex industrial structures such as blast furnaces, chemical reactor vessels or towers, certain kinds of stacks, and so on. In the first stage of the current aseismic design of these structures, the maximum base shear transmitted to each component is assumed in advance in order to obtain a precise stress analysis of each one. It is significantly important, therefore, to provide well-grounded base shear distribution in place of the conventional values which are decided via a static analysis at most. This paper aims to examine the effects of dynamic interaction on the base shear distribution between equipment and its supporting frames during earthquakes. The random vibration theory is applied to obtain the average peak responses of simplified interaction models placed on a base which is being stimulated by ground acceleration having the standard power spectrum. The expected maximum values of the rocking moment distribution are obtained as the function of dynamic characteristics of both components and the interaction spring. These results are presented graphically for convenience so as to determine the rational base shear distribution of structures composed of equipment and its supporting framed.