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

在地震中，一个标准的钢筋混凝土柱在塑性铰区发生塑性变形，在强近场地震动作用下。虽然侧向约束能有效地提高结构的塑性变形能力，但地震后的损伤很可能需要修复。本研究旨在发展一种在塑性铰处设置橡胶层的柱，使柱具有4%的位移变形能力，而不破坏混凝土。预应力筋安装在柱中，以抵抗除钢筋外的拉力。对11根钢筋混凝土柱进行了低周反复荷载试验。进行纤维元素分析以解释测试结果。试验分析表明，橡胶层嵌固柱塑性铰区混凝土的破坏极为有限。因此，得出的结论是，虽然有许多问题有待解决，以实现实施的无损伤柱的发展，它能够变形高达4%的漂移，而没有显着的损害已经完成。

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.