Shaking table test on RC frame installed with metallic dampers using wall-pattern connections
Shang Qingxue1 Zhang Xipeng2 Wang Tao1 Zhou Zhongyi1 Li Jichao1
1. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, CEA, Harbin 150080, China;
2. Yunnan Vanke Co., Ltd., Kunming 650000, China
Abstract：To examine the effectiveness of the wall-pattern connection and control effects of metallic dampers, four-story frames without and with metallic wall dampers (namely uncontrolled structure and controlled structure) were designed and built at a scale of 1/4 for shaking table tests. One artificial ground motion and the Takatori earthquake were selected and scaled to different earthquake intensities for the shaking table tests. Dynamic characteristics (including fundamental frequency and damping ratio) and structural responses (including displacement, acceleration and shear force) of the test models were compared. The experimental results indicate that metallic wall dampers can provide additional stiffness and additional damping at the same time. The structural stiffness of the controlled structure is always larger than that of the uncontrolled structure, and the damping ratio of the controlled structure is greatly increased compared with that of the uncontrolled structure. The control effect on displacement of the controlled structure is remarkable. The wall-pattern connection method of metallic dampers has sufficient stability and effectiveness. For the connecting part, no damage was observed under service level earthquake and micro-crack occurred under design basis earthquake. Shear cracks were observed at the intersection between beam and connecting wall under the maximum considered earthquakes, but the reliability of the connections can be ensured. The displacement ratio of dampers attained from test results ranged from 0.4 to 0.6. It is necessary to study how to ensure a large displacement ratio of the dampers, so that the effectiveness of the dampers in future research can be improved. In addition, the influence of near-fault ground motion on structural seismic response shall be studied further.
