Pseudo-dynamic test analysis on blind bolted joints between square CFDST columns and steel beams
Wang Jingfeng1,2 Zhong Liping1 Guo Lei1 Pan Xuebei1 Lu Jia1
1. School of Civil Engineering, Hefei University of Technology, Hefei 230009, China；
2. Key Lab of Anhui Civil Engineering Structures and Materials, Hefei University of Technology, Hefei 230009, China
Abstract：In order to investigate the dynamic response and failure mechanism of blind bolted connections in concrete filled double skin steel tubular (CFDST) columns, cruciform specimens representing the internal substructures of a multi-story frame were tested under seismic loads. Through the experimental results, the influence of end plate type, hollow ratio of column and demountable composite floor was analyzed. The dynamic response and failure modes of the test specimens were observed under different earthquake waves. The seismic performances, such as hysteretic behavior, dynamic magnification factor, damping ratio, stiffness degradation and energy dissipation capacity, were explored. The test results show that the blind bolted connections in the CFDST columns have good seismic performance and ductility, so they can be applied in high-rise assembled steel structures located in high-intensity earthquake areas.
