1995年兵庫県南部地震における基礎有効入力動に関する考察

概要

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There are a few stations in which strong earthquake motions were recorded simultaneously at structural foundations and on surface of the ground in the 1995 Hyogo-ken Nanbu earthquake. Comparing the maximum accelerations observed at the foundations with those on the ground surface shows that the former is reduced 30%, and 10% for velocity on average. In the area considered to have experienced more severe ground motions e.g. such as larger than 400 gal corresponding to the second step threshold of the present building code of Japan there are no simultaneous recording stations. The surface ground motions are simulated backward from the records of two structures in and near severely damaged zone using soil-structure interaction theory considering non-linearity of both structure and ground. Calculated results show similar reduction tendency to the above-mentioned observed results. It is also deduced that the reduction of peak values on the foundation to the ground surface resulted from amplification of soil layer over the bottom of the structure.
社団法人日本建築学会の論文
1998-10-30