土塗り壁を有する伝統木造建築物の大変形領域におけるせん断剛性評価に関する実験的研究

In this study, the authors evaluated the structure performance in large deformation domain of the traditional wooden building from the micro tremor measurement, namely, micro deformation domain. To evaluate structure performance, the static shear loading tests were carried out using new construction and re-construction of mud-walls. Here, the experiment by the re-construction of mud-walls were carried out for the following reasons. Many Japanese traditional wooden building are being maintained by the half dismantling and the partial dismantling for a long time. In consideration of it, the re-construction of mud wall was built by reusing timber. As a result of the experiment, the shear stiffness with the deformation to increase of the mud-wall was quantified. And the authors hypothesized that the result was similar with shear stiffness by the deformation to increase of ”the real-scale timber case study house” with the mud-wall. At first, the equivalent shear stiffness Km was obtained by substituting the natural period given by the micro tremor measurement into the equation (4). Then, Shear stiffness K1/600 of a story deformation angle 1/600 demands it by multiplying coefficient of correlation β by equivalent shear stiffness Km. The change of structure performance after story deformation angle 1/600 is decided by parameter a, b of the equation of regression based on the experiment. β in this examination uses equivalent shear stiffness ratio β (K1/600/Km) measured at the time of the one-way loading test. The one-way loading test was performed for “the real-scale timber case study house” to confirm the validity of method previously described. In addition, it was performed including a free vibration experiment to evaluate dynamic structure performance. The main results obtained from these studies are as follows. From the result of the static shear loading tests, new construction mud-walls and re-construction mud-walls showed equal structure performance. As for the shear stiffness by the increasing transformation of mud-wall, variation becomes small in the large deformation domain. As a result of having performed curve fitting by orthogonal polynomials and least square approximation for the Fourier spectrum, theoretical formula was almost reproducing the measurements. This is indication that natural vibration mode can be estimated by the free vibration test. In addition, although some difference is observed between the free vibration measurements and one-way loa