Study on Hysteresis in Sustainable Two-Layer Circular Tube under a Lateral Compression Load

Authors: Ami Nomura, Ken Imanishi, Yukinori Taniguchi, Etsuko Ueda, Tadahiro Wada, Shinichi Enoki

Abstract:

Recently, there have been a lot of earthquakes in Japan. It is necessary to promote seismic isolation devices for buildings. The devices have been hardly diffused in attached houses, because the devices are very expensive. We should develop a low-cost seismic isolation device for detached houses. We suggested a new seismic isolation device which uses a two-layer circular tube as a unit. If hysteresis is produced in the two-layer circular tube under lateral compression load, we think that the two-layer circular tube can have energy absorbing capacity. It is necessary to contact the outer layer and the inner layer to produce hysteresis. We have previously reported how the inner layer comes in contact with the outer layer from a perspective of analysis used mechanics of materials. We have clarified that the inner layer comes in contact with the outer layer under a lateral compression load. In this paper, we explored contact area between the outer layer and the inner layer under a lateral compression load by using FEA. We think that changing the inner layer’s thickness is effective in increase the contact area. In order to change the inner layer’s thickness, we changed the shape of the inner layer. As a result, the contact area changes depending on the inner layer’s thickness. Additionally, we experimented to check whether hysteresis occurs in fact. As a consequence, we can reveal hysteresis in the two-layer circular tube under the condition.

Keywords: Contact area, energy absorbing capacity, hysteresis, seismic isolation device.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1097148

References:

[1] N. Murota, Japan’s Latest Earthquake-Resistance Technology, Highlighting Japan, April 2010, pp. 7–9.
[2] A. Taylor, I. Aiken, What’s Happened to Seismic Isolation of Buildings in the U.S.?, Structure magazine, March 2012, pp. 10–13.
[3] A. Kinoshita, S. Fujita, H. Kurabayashi, T. Fukasawa, S. Arai, Dynamic Test of Isolation System for Light-Weight House Using Coil spring, Dynamics and Design conference , 2005, pp. “434-1”–“434-5”, (in Japanese).
[4] I. Nishimura, S. Suzuki, Research and Development of Base Isolated Houses Supported by Laminated Rubber Bearings (Part I: Perspective and Restrospective of the project), Architectural Institute of Japan, 2008, pp. 443–444, (in Japanese).
[5] H. Tanahashi, Y. Suzuki, Major Mechanical Types of Traditional Wooden Joints and Embedment Mechanisms, Journal of Cultural Heritage Disaster Mitigation, November 2011, pp. 171–178, (in Japanese).
[6] T. Ota, S. Enoki, Material design of a biomimetic composite material used for a wooden building joint structure, WIT Transactions on Ecology and the Environment, 138, 2010, pp. 329–338.
[7] Enoki, S, Mechanical Property of Metal Lattice filled Low-Rigidity Material in the Cells, Proc. of 2012 Spring Annual Conference JSDE, 2012, pp. 23–24, (in Japanese).
[8] A. Nomura, E. Ueda, T. Wada, and S. Enoki, Design condition of a sustainable two-layer circular tube with absorbing energy capacity, WIT Transactions on Computational Methods and Experimental Measurements, 151, 2013, pp. 103–114.