| 英文摘要 |
The main objective of this study was to evaluate the maximum sliding displacements of unanchored equipment placed on the ground or floor during earthquakes. Shaking table tests were conducted to investigate the sliding responses of unanchored equipment. In the tests, steel frames were used to represent equipment and were placed on plastic floors connected to the shaking table. The base of steel frames adopted three types of materials: rubber, plastic, and Teflon, corresponding to high, medium, and low coefficients of friction, respectively. It is observed that the maximum sliding displacement may result from a single predominant sliding incident or multiple sliding incidents due to the effects of stick-slip phenomenon. This paper presents a simple formula using rectangular pulse as input to estimate the maximum sliding displacement of unanchored equipment under earthquakes. From a comparison to the test results, the formula gives reasonable predictions of the maximum sliding displacement. Nevertheless, evaluation of the sliding displacement due to the stick-slip effects needs further study. |
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