ROCKING SPECTRUM INTENSITY MEASURE FOR SEISMIC ASSESSMENT OF ROCKING BLOCKS

Abstract eng:
In this study a spectral ground motion intensity measure (IM) is presented. The proposed IM is calculated throughout the rocking spectrum which is illustrated as a 3D surface diagram, with the slenderness α and the period T, the two horizontal axes. Thus, the IM is defined as the volume under the rocking spectrum, evaluated throughout integration. The suggested IM is intended to have strong correlation with the rocking response of free standing blocks. Several rocking rigid blocks subjected to multiple ground motion records are assumed in order to identify the capability of the IM to predict the rocking response concerning the variability of the block dimensions. The selection of the dimensions was made in order to correspond to slender rocking structures such as electric equipment, ancient monolithic columns and bridges piers. The evaluation of the IM was also made by examining characteristics such as efficiency and proficiency. Further, the performance of the proposed IM is contrasted with the performance of others well-known ground motion parameters, to highlight the adequacy of the former in predicting the rocking seismic response.

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