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Damage detection and estimation of a steel frame through shaking table test and measurements

We carry out shaking table test using a three-story large-scale steel structure with cementitious devices to detect and estimate damages. The test frame floor height is 1.8m, total height is 5.4m, floor plan is 4mx3m. Shaking table test is carried out at large-scale earthquake simulator facility of the National Research Institute for Earth Science and Disaster Prevention. Cementitious devices are installed in the center frame of tested structure and devices are actually damaged during the shaking. Two types of identification are tried. One is identification using the data under excitation and the other is identification using the data of before and after of the excitation. In both cases, we use identification method by ARX model. From identified results, natural frequency decreases, damping ratio increases and story stiffness decreases as experienced amplitude increases or input amplitude increases. A model using stick-slip elements is proposed. Natural frequency, damping ratio and story stiffness described by this model are consistent with experimental results. The fitting of the experimental result based on this model is carried out, and skeleton curve got from structural design and fitting result are corresponded well. Damage evaluation method using this fitting results and skeleton curve is proposed.