Motion Analysis of Pendulum Type Isolation Systems During Earthquakes (Probabilistic Study of Isolation Performance of Base Isolated Structure Considering Characteristic Dispersion of Pendulum Type Isolation Systems)

[+] Author and Article Information
Shigeki Okamura

 Graduate School of Tokyo Denki University, 2-2 Kanda-Nisiki-cho, Chiyoda-ku, Tokyo 101-8457, Japanshigeokamu@yahoo.co.jp

Satoshi Fujita

 Tokyo Denki University, 2-2 Kanda-Nisiki-cho, Chiyoda-ku, Tokyo 101-8457, Japansfujita@cck.dendai.ac.jp

J. Pressure Vessel Technol 129(3), 507-515 (Jul 05, 2006) (9 pages) doi:10.1115/1.2748831 History: Received December 16, 2005; Revised July 05, 2006

Most of the base isolated buildings or structures are built on laminated rubber bearings in order to give them certain natural periods. This situation, however, also encourages structural engineers to research and develop nonrubber-type isolation systems such as linear motion bearing isolators and friction pendulum systems. It is considered that the nonrubber-type isolation systems can be applied to important industrial facilities, such as LNG tanks, boiler facilities, and so on, to refine their seismic reliabilities. This device of a nonrubber-type isolation system uses the energy loss associated with sliding to reduce the deleterious effects of earthquakes. However, when using nonrubber-type isolation systems with sliding in the atmosphere, long term durability of the systems must be taken into account. It may be difficult to maintain the friction coefficient of the system. In this paper, a stochastic study of the effect on rotational motion and isolation performance of two structures subjected to an earthquake with a friction pendulum bearing is analyzed with a Monte Carlo method.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Friction pendulum bearing

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Figure 2

Monte Carlo simulation

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Figure 3

Analysis model-1

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Figure 4

Analysis model-2

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Figure 5

Model coordinates

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Figure 6

Algorithm for phase change

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Figure 7

Determination of phase

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Figure 8

Convergence of average and standard deviation of maximum rotational angle

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Figure 9

Average and existence range of maximum response (analysis model-1)

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Figure 10

Average and existence range of maximum response (analysis model-2)

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Figure 11

Configuration of device

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Figure 12

Rotational motion of structure

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Figure 13

Dispersion of center of friction force

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Figure 14

Distance of center of friction and center of gravity for the number of devices



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