Study on the estimation method of residual ductility of damper in damage tolerant structure

损伤容限结构，其中地震能量完全由阻尼器耗散，以减轻柱和梁的损坏，被采用在大量的建筑物中，因为在强烈地震后的建筑物的占用率或可修复性的要求很高。为了合理规划阻尼器的修复工作，还需要对阻尼器在塑性载荷作用下的损伤进行诊断的技术。本研究的目的是从现场检测中得出阻尼器损伤的估计方法。目标是工业化房屋中使用的低屈服点钢阻尼器。通过一系列的试验，证实了损伤后阻尼器的残余延性与硬度与初始值的差值以及截面形状的变化成正比。因此，可以设想通过硬度测试或测量截面形状来估计阻尼器的损坏。

The damage tolerant structure, in which seismic energy is exclusively dissipated by dampers in order to mitigate the damage of columns and beams, is adopted in a good number of buildings, because the occupancy of the building after a severe earthquake or the reparability is highly demanded. The technique to diagnose the damage of dampers due to plastic loading is also demanded in order to plan their rehabilitation appropriately.The aim of this study is to derive the estimation method of the damper's damage from the on-site inspection. The target is low-yielding-point steel dampers used in industrialized houses. A series of experiments was carried out, and it was confirmed the residual ductility of damaged damper was proportional to both the difference of hardness from the initial value and the transformation of the section-shape. Therefore, it is conceivable that the damage of damper can be estimated by hardness test or measuring the section shape.