A questionnaire survey about shaking and damages of the super high-rise RC buildings during the 2011 off the pacific coast of Tohoku earthquake was conducted for the residents. The survey was conducted for 15 super high-rise residential buildings in the Kanto and the Kansai areas in late July 2011, about 4 month after the main shock. The following conclusions were reached; (1) The anxiety during the main shock tends to be higher than the action difficulty with same questionnaire seismic intensity. (2) The relationship between questionnaire seismic intensity and the damages to the interior materials and the concrete member showed an inverse correlation. (3) The questionnaire seismic intensity and the action difficulty, the tendency of damage situations to the interior materials and concrete member differ between 2 buildings which are close to each other. (4) The building that built at an area where significant liquefaction had occurred suffered relatively-great damages. (5) At the lower part of the buildings, many residents heard a squeak sound of building during the main shock or the aftershock.
SUMMARYEvaluation of the degrees of structural damage suffered by high-rise residential buildings after being subjected to strong ground motions is extremely important to the development of life continuity planning for building residents. However, these evaluations cannot be based on strong-motion records alone, because earthquake observation equipment is not installed in most such buildings in Japan. In this study, we propose simple equations for estimating the stiffness degradation rate and the peak inter-story drift ratio (PIDR) by using ambient vibration records instead of strong-motion records when high-rise RC buildings are subjected to a severe earthquake. More specifically, we propose one equation that relates the square root of the stiffness degradation rate, which is the ratio of natural frequencies at the maximum response to the preliminary tremor response (elastic state), in strong-motion records with the ratio of natural frequencies identified from ambient vibrations before and after damage was suffered. We also propose an equation that relates the PIDR with the stiffness degradation rate on the basis of the stiffness-degrading bilinear restoring force characteristic derived from the strong-motion records of 13 high-rise buildings for the 1995 Hyogoken-Nanbu Earthquake (Mw 6.9) and the 2011 Tohoku-Oki Earthquake (Mw 9.0).
In this study, the seismic response analysis model of a human body based on cart-type double inverted pendulum was developed based on the shaking table tests with a human subject. The behavior of two types of model, the model without torque control of hip and the model with that, were compared with respect to response of human subject. The results from the model with torque control of hip agreed well with the human subject's behavior. Finally, the validity of the model was confirmed by the analysis with other input motions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.