31 過大地震動下における免震建物の応答と損傷特性

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This paper presents a study on the response of base-isolated building structures when subjected to near-fault ground motions and colliding with the surrounding retaining walls. Horizontal force versus horizontal deflection relationships of retaining walls including the soil behind are estimated using FEM analyses, and it was found that the retaining walls are more flexible than the superstructure but similar in strength to the superstructure. A series of numerical analyses are conducted to characterize the damage to superstructures when collided with the retaining walls. The first story of the superstructure commonly sustains the largest damage, while the upper stories remain nearly elastic. Once the first story is strengthened to remain elastic, then the deformation increases either in the base-isolation layer or in the second story. These characteristics are found to be strongly affected by the relative strengths among the superstructure, retaining walls, and base-isolation layer. A method to estimate the deformations to the superstructure at collision instances is also proposed.
一般社団法人日本建築学会の論文
2005-03-20