THE DYNAMIC SOIL-BUILDING INTERACTIONAND THE REDUCTION OF INPUT MOTION OF CONTEMPORARYTIMBER HOUSES

摘要

This paper describes the dynamic soil-structure interaction of two storied contemporary timber houses anda five storied R/C structure based on earthquake observations. Comparison is made on the elongationratio of natural period, amplification factors and the damping effect between two storied timber housesand a five storied R/C building. The main results are as follows;The elongation ratio of natural period is about 2 to 8 % in the timber houses, on the other side, about 30 %in the R/C building. Judging from the maximum acceleration ratio of 1st floor to ground level, thereduction of input motion to timber houses is extremely small compared to the R/C building.Amplification factors of peak values obtained from the ratios of top floor to 1st floor in the timber housesare larger than that of the R/C building. The damping effect in the timber houses is very small comparedto that of the R/C building. Consequently, it is not evident that the soil-building interaction effect couldbe taken into the structural design of timber houses because of the lack of data.