Development of Damage-Free columns with using Plastic-Deformable Materials in the Plastic-Hine Region

在地震中，标准钢筋混凝土柱在强烈的近场地面运动作用下，在塑性铰区域发生塑性变形。虽然侧向约束可以有效地提高结构的塑性变形能力，但震后很可能需要对损伤进行修复。本研究旨在研制一种在塑性铰处嵌入橡胶层的柱，使其在不损伤混凝土的情况下具有4%的漂移变形能力。除了钢筋外，柱中还安装了预应力筋，以抵抗拉力。对11根钢筋混凝土柱进行了反复荷载试验。对测试结果进行了纤维成分分析。通过试验和分析发现，橡胶层内置柱对混凝土塑性铰区域的损伤非常有限。因此，尽管实现无损伤柱的实现还有许多问题需要解决，但仍有许多问题有待解决，从而完成了无损伤变形至4%的无损伤柱的研制。

In an earthquake, a standard reinforced concrete column develops plastic deformation in the plastic hinge region under a strong near-field ground motion. Although the lateral confinement is effective to enhance the plastic deformation capacity, it is likely that the damage has to be repaired after an earthquake. This study aims at developing a column in Which a rubber layer is built-in at the plastic hinge so that the column has a 4% drift deformation capacity without damage in the concrete. Prestressing tendons are installed in the column in order to resist tension force in addition to reinforcing bars. A cyclic loading test is conducted for eleven reinforced concrete columns. Fiber element analysis was conducted to interpret the test results. It is found from the test and analysis that damage of concrete in the plastic hinge region is extremely limited in the rubber layer built-in columns. Thus, it was concluded that the development 'of damage-free column which enables to deform up to 4% drift without having significant damage Was completed although there are many problems which remain to be solved to realize the implementation.