Research and development of three dimensional measurement technique for shake table test using image processing

In recent years, the importance of the fracturing test using the full-scale model is recognized in order to upgrade an earthquake resistant design. It is, moreover, important to develop a new measurement technique which can measure complex three-dimensional behaviour in such fracturing test. This study has been doing research and development of new three-dimensional measurement technique using image processing technique for a measurement of dynamic displacement caused by the fracturing process in shake table test without any contact. This measurement system is a very convenient system because it can measure the three-dimensional dynamic displacement in the simple experimental condition that the several makers are only attached to the surface of an experimental structure. The system therefore is the most suitable measurement system for an evaluation of complex three-dimensional behavior of test model. This measurement system will measure the fracturing process of the real scale structures of bridges, buildings, tanks, electric power facilities, soils, underground structure and so on. Fundamental hardware and software for the measurement system has been constructed until now. The fundamental dynamic measurement accuracy and effectiveness of the measurement system has been also confirmed from several shake table tests. This paper describes the measurement performance in actual fracturing test. The full scale wooden houses were used for the shake table test. (authors)