京町家の耐震補強に関する実験的研究

It is known that Japan has entered a period of brisk seismic activity starting with the 1995 Hyogo-ken Nambu earthquake. The past earthquakes caused collapse of a lot of traditional wooden houses and human suffering in various parts of Japan. Therefore, it is important to conduct appropriate seismic evaluation and reinforcement to improve the seismic performance of the houses.On the other hand, the calculation method of response and limit strength is often used in reinforcement design of traditional wooden houses which have low strength relatively. However, the structural characteristics of traditional wooden houses, such as a) uplift of columns adjacent mud walls, b) reverse shear force of through columns, c) slide of column bases, d) breakage of through columns and joints by shear resisting elements local in a plane structure, are difficult to be taken into account by the calculation method regularly used in reinforcement design of traditional town houses, machiya, in Kyoto.Therefore, we thought that it is very effective and important to demonstrate seismic reinforcement of traditional wooden houses. In particular, machiya in Kyoto have typical plane frames and ripple effect is expected by effective reinforcement examples of the typical plane frame.From the above, in this paper, we demonstrate the effect of the seismic reinforcement of machiya in Kyoto by the experiments and the simulation analyses. First, we conduct the static loading tests of the unreinforced and reinforced plane frame structures of the typical two-storied machiya in Kyoto. Then, we analyze the difference of the restoring force characteristics and the damages between the unreinforced and reinforced frames. Finally, we simulate the static loading tests with the analysis models to confirm the effect of the seismic reinforcement in detail and whether we can detect the undesirable seismic reinforcement method using the simulation analyses. The major findings obtained from the research are summarized as follows:a) In the frame which has a wall only in the first story, the deformation angles of the first story and the second story become uniform by adding a wall to the second story. As the result, the damage of the through columns and the joints decreases and the reverse shear force of the through columns goes down. Besides, the rocking deformation of multi-story walls is expected to increase the deformation performance of the whole frame structure.b) The increase of the stiffness and the st