DYNAMIC CHARACTERISTICS OF TRADITIONAL TIMBER HOUSES EXISTING IN TOCHIGI-PREFECTURE BASED ON THE MICROTREMOR MEASUREMENTS

摘要

The dynamic characteristics of traditioanl timber houses existing in Tochigi-prefecture are investigated from the microtremor measurements. The main results are follows;The natural frequencies of traditional timber houses distribute from 2.5 to 50.Hz, and these values are approximately equal to those of contemporary timber huses, construction stage of which is fame work with bacing members. The damping constants of traditional timber houses distribute from 2.6 to 9.2/100,and these values are larger than those of contemporary timber houses by about 20/100. The damping constant is in inverse proportion to the natural frequency in case of traditional timber houses. It becomes clear that th number of wall and the weight of house are main factors ot determine the dynamic characteristics of the traditional and contrmporay timber houses.