Design Condition Of A Sustainable Two-layer Circular Tube With Energy Absorbing Capacity
Free (open access)
103 - 114
A. Nomura, E. Ueda, T. Wada & S. Enoki
Recently, there have been a lot of earthquakes in Japan. Therefore, it is necessary to attach seismic isolation devices to detached houses. However, almost all detached houses do not have any seismic isolation devices attached, because the seismic isolation devices are expensive. Therefore, it is necessary to develop a low-cost seismic isolation device. We created a new energy absorbing device filled with low rigidity material in two-layer circular tubes. If hysteresis is produced in the two-layer circular tube under lateral compression load, we think that a two-layer circular tube can have energy absorbing capacity. Therefore, we think that the device has a high energy absorbing capacity. For hysteresis to occur, friction should exist between the outer layer and inner layer. Also, we should reveal a force of elastic limit to have sustainability. In this paper, in the case that outer layer is made of stainless steel and inner layer is made of acrylic plastic, we evaluated the deformation and the stress of each circular tube. As a result, we were able to clarify the relationship between the contact condition that friction occurs in each circular tube and external force of elastic limit. Keywords: seismic isolation device, two-layer circular tube, contact condition, sustainability, energy absorbing capacity.
Keywords: seismic isolation device, two-layer circular tube, contact condition, sustainability, energy absorbing capacity.