Experimental study on CFST column-to-steel beam frames with high-strength blind-bolted endplate connections under pseudo-static loading
Wang Jingfeng1,2 Wang Haitao1,3 Wang Donghua1 Sun Zheng1
1. Hefei University of Technology， Hefei 230009, China
2. Key Lab of Anhui Civil Engineering Structures and Materials, Hefei University of Technology, Hefei 230009, China
3. Hunan University， Changsha 410082, China
Abstract：In order to investigate the seismic behavior and failure mechanism of semi-rigid concrete-filled steel tubular (CFST) frames with endplate connections under pseudo-static loading, two two-layer one-span specimens of blind bolted endplate connected frames between CFST columns and steel beams were conducted. The test specimens included one circular CFST frame and one square CFST frame. The influence of column section type and the end plate type on the frame failure modes and seismic performance were studied. The whole loading progress and failure characteristics of two specimens under low cycle loading were discussed. The hysteretic curves, skeleton curves, degradation curves of strength and stiffness, and the energy dissipation capacity were also analyzed. The ductility was evaluated according to the description of present specifications. The test results show that the semi-rigid CFST frames with high-strength blind-bolted endplate connections have good hysteretic behavior, ductility and energy dissipation. The ductility coefficient μ is between 2.41 and 3.75. The energy dissipation coefficient is between 0.823 and 0.955. Under the same steel ratio of the column section, the ultimate bearing capacity and energy dissipation of square CFST frame were higher than those of circular CFST frame. The proposed high-strength blind-bolted endplate connections, which performed typical semi-rigid behavior， show reliable connection and excellent seismic performance. The research results can lay foundation for design theory and application of the fabricated composite structures.
王静峰 王海涛 王冬花 孙政. 钢管混凝土柱-钢梁单边高强螺栓端板连接框架的拟静力试验研究[J]. 土木工程学报, 2017, 50(4): 13-20.
Wang Jingfeng Wang Haitao Wang Donghua Sun Zheng. Experimental study on CFST column-to-steel beam frames with high-strength blind-bolted endplate connections under pseudo-static loading. 土木工程学报, 2017, 50(4): 13-20.
