可変振り子センサを用いた既存建築物動特性の推定法 : 一方向せん断型試験体を用いた実験的検証

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This paper reports the result of experimental verification on performance and accuracy of structural identification using Variable Pendulum Sensor (VPS) seismic evaluation of existing building structure. A SDOF shear model which consists of one steel plate and four columns was used as structural model. A prototype of VPS, which can change the swinging cycle of the pendulum by changing springs, was installed on the upper surface of the plate, and an excitation device was mounted on the lower surface of the same plate. Responses of the structure and the mass of the VPS were measured before and after changing the springs of the VPS. Sweep wave with sufficient period and frequency range to include natural frequencies of the model was used as excitation input. As the physical dynamical parameters, the mass, the shear stiffness, and the damping coefficient of the model were identified from the observed response data, by prediction error method and using reduplicated state-space model derived from the equations of motion before and after the shifting of the swinging cycle of the pendulum. Result of the experiment shows that VPS can successfully estimate the physical dynamical parameters of SDOF shear model.
2009-03-27