Research on Connecting Method Between Hysteretic Damper and Reinforced Concrete Frame

近年来，柱式滞回阻尼器在高层钢筋混凝土建筑中得到了应用。这根柱子原来是H型钢，在中等高度的腹板上有低屈服强度的钢。在钢筋混凝土框架中，柱子的上下两端通常通过端板和地脚螺栓与钢筋混凝土梁连接，并由钢筋混凝土底座包裹，以增加腹板的剪切变形。然而，柱子与钢筋混凝土底座之间的应力传递机制尚不清楚。钢筋混凝土基础的非弹性行为一直没有得到充分的研究，这对阻尼器的性能有很大影响。此外，这种采用地脚螺栓的连接形式非常复杂，在建筑施工中不经济。本研究的目的是开发一种新的、更合理的柱式滞回阻尼器的连接方法，阐明柱式滞回阻尼器的应力传递机理和循环性能。开发了一种新型节点，在钢筋混凝土底座的H型钢翼缘上只有螺柱剪力连接件。在试验中，采用该节点的1/2比例柱式滞回阻尼器试件表现出了良好的阻尼器性能。对于钢筋混凝土基层的受力性能，通过对试验数据的分析，得到了应力传递机理模型和荷载-变形关系模型。提出了R/C底座的设计方法。提出了柱式滞回阻尼器的荷载-变形关系模型。该模型考虑了钢筋混凝土支座的非弹性弯曲和剪切变形，可用于设置柱式滞回阻尼器的建筑的地震反应分析。

Recently, pillar type hysteretic dampers have been applied to high-rise reinforced concrete (R/C) buildings. This pillar is originally H-shaped steel and has low yield strength steel in the web at the middle height. In R/C frames, the both upper and lower ends of the pillar are usually connected to the R/C girders using end plates and anchor bolts, and also encased by R/C base to increase the shear deformation of the web. However, the stress transfer mechanism between the pillar and the R/C base has not been clarified. The inelastic behavior of the R/C base has not been sufficiently investigated, which has influence on the performance of the damper. Furthermore, this type of connection using anchor bolt is very complicated and not economical in building construction. The purpose of this research project is to develop a new and more rational connecting method of pillar type hysteretic dampers and to clarify the stress transfer mechanism and the cyclic behavior of the pillar type hysteretic damper.The following results are obtained from this research project.1. A new type connection, which has only stud shear connectors at the flange of H-shaped steel in the R/C base, was developed. In the experiments, 1/2 scale pillar type hysteretic damper specimens using this connection showed excellent performance as the damper.2. As for the behavior of the R/C base, models for the stress transfer mechanism and the load-deformation relationship were obtained from the analysis of the experimental data. The design method for the R/C base was developed.3. A model for the load-deformation relationship of the pillar type hysteretic dampers was proposed. The model is considering the inelastic flexural and shear deformations of the R/C bas, and can be used in earthquake response analysis of buildings with the pillar type hysteretic dampers.