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6Šª
”NF
1982”N
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1025-1032•Å
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PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM
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Tatsuo UWABE, Norihiro HIGAKI
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SHAKING TABLE TESTS STUDY FOR DISPLACEMENTS COMPUTING METHOD OF SLIDING BLOCK IN WATER DURING EARTHQUAKES
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Shaking table tests of a model caisson were conducted to study sliding block in the water during earthquakes. The tests were designed to grasp the sliding block behavior during earthquakes, and to check the validity of the displacement computing method of the sliding block. The decrease of the dynamic coefficient of friction with the increase of the relative velocity was assumed by the shaking table test results. In case that a relative velocity between a block and a base occurs by the response of the block subjected to earthquake accelerations, the start of the block sliding does not depend on a static coefficient of friction but on a dynamic coefficient of friction. Under above mentioned matters the displacement computing method of the sliding block during earthquake is Presented. The calculated displacements show a good agreement to the observed values. And the validity of the dynamic coefficient of friction used for calculations verified. Sliding block tests with the water show that the effects of the water are evaluated by the added mass which corthe hydrodynamic pressure on the sliding block, and responds to that the hydrodynamic pressures during a sliding keep a value generated at the beginning moment of the sliding.
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