構造用合板を耐力壁とする木造住宅の地震後の残余性能

Abstract

It is very important to estimate the residual seismic performance of buildings damaged by earthquakes in order to repair and reinforce these damaged buildings appropriately. The residual seismic performance of wooden buildings after earthquakes is calculated by the all energy on the basis of the load-displacement relationship until the safety limit deformation and the consumed energy until the experienced response displacement during earthquake. However, there is little knowledge about the actual residual seismic performance of wooden buildings, and the effectiveness of this evaluation method is not established. In this study, in order to consider the effectiveness of the evaluation method of residual seismic performance of wooden buildings, the time history analysis used modified model based on Evolutionary Parameter Hysteretic Model and the shaking table tests for wooden structures with plywood bearing walls were conducted. As a first step of the study, the detailed relationship between maximum response displacement and residual seismic performance were evaluated by using the time history analysis. Next, the modified evaluation method of the residual seismic performance was proposed from this result. Finally, we investigated the effectiveness of proposed seismic performance evaluation through the shaking table tests of wooden structures. The results of the time history analysis and the shaking table tests are summarized as follows. 1)The residual seismic performance did not degrade until the range of around 1/100 -1/50rad. in the story drift, and decreased rapidly beyond the range of 1/100 -1/50rad. 2)The evaluation equation of the residual seismic performance was defined as n=1.0 in the past study, but the proposed evaluation method defined as n=0.6 drawn in the lower limit values obtained from the analysis results. 3)In the shaking table tests, maximum responses of the specimens that were repaired based on the modified evaluation method defined as n=0.6 were showed smaller than the target responses. It was demonstrated that the modified evaluation method defined as n=0.6 was obtained the safer values.