Abstract
This paper describes the effect of arrangement and area of floor well to vibration characteristics of two storied wooden houses by means of vibration table tests. This effect of arrangement and area of floor well includes the effect of mass eccentricity. Therefore, we examine the effect of these factors by using different series of full scale specimens, separately. First, we examine the effect of arrangement and area of floor by using specimens with floor well. Second, we examine the effect of mass eccentricity by using specimens with eccentric masses instead of floor well. And finally, we examine the combined effects by using specimens with floor well and eccentric masses. The main results obtained by these experiments are as follows. Natural frequencies of these specimens with floor well are approximately 3.34 Hz that are only by 1.5% large or small compared with ones of the specimen without floor well. Specimens with floor well that situated at side of weak wall are apt to vibrate with large torsion. The relative displacements between first and second floor are apt to influenced by mass eccentricity, and those of second and third floor are apt to influenced by floor well.
