抄録
In this paper, we present the experimental results of a series of microtremor measurements of a RC building during demolition work (reduction process) in order to clarify their properties in dynamics. The RC building was reduced from 5 stories + 1 story penthouse to 4 stories. We conducted microtremor measurements before, during and after reduction process. Natural frequencies of the RC building were increased in accordance with its reduction process and strengthening works. Based on the equivalent single degree of freedom system, influence of weight reduction and stiffness increment on natural frequencies by reduction process and seismic strengthening is clarified.
