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| Dynamic performance analysis of joints of RC frame structure with NES |
| YANG Haixu1, SHI Ming1, WANG Haibiao1, FAN Dingjian2, ZHANG Maohua1, SHI Xinyu1 |
1. School of Civil Engineering, Northeast Forestry University, Harbin 150040,China;
2. Shanxi Modern Architecture Design and Research Institute, Xian 710021, China |
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Abstract In order to study the influence of NES shock absorber on the seismic performance of reinforced concrete frame structure joints, a new type of NES shock absorber was designed and manufactured, and a shaking table test of a five-story reinforced concrete frame structure with a scale of 1∶4 was carried out to analyze the changes of steel bar strain, joint failure mode, structural displacement and structural natural frequency at the joints of first and second floors of NES frame structure after earthquake damage. The test results show that the NES shock absorber can effectively reduce the strain of longitudinal hoop bars of reinforced concrete beams and columns, reduce the relative displacement of the structure, slow down the generation of plastic hinges at the bottom and top of the column, and there are beam end failure and in-joint shear failure at the joints, which basically fulfills the “strong column and weak beam” mechanism of the frame. The NES shock absorber can effectively reduce the shear stress of the concrete at the joint and thus alleviate the shear failure of the joint concrete. The final failure of the whole structure is caused by the yield of the steel bar at the bottom of the column, the crushing of the concrete at the foot of the column and the loose connection with the bottom plate. After setting up NES shock absorber, the decline rate of structural natural frequency decreases, and NES nonlinear shock absorber has a good control effect in reducing structural seismic response, improving structural anti-seismic capacity and reducing structural damage.
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Received: 10 October 2018
Published: 28 March 2020
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