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Structural Engineering and Mechanics Volume 68, Number 4, November25 2018 , pages 475-483 DOI: https://doi.org/10.12989/sem.2018.68.4.475 |
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Behavior of improved through-diaphragm connection to square tubular column under tensile loading |
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Ying Qin, Jing-Chen Zhang, Peng Shi, Yi-Fu Chen, Yao-Han Xu and Zuo-Zheng Shi
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| Abstract | ||
| Square tubular columns are commonly used in moment resisting frames, while through-diaphragm connection is the most typical configuration detail to connect the H-shaped beam to the column. However, brittle fracture normally occurs at the complete joint penetration weld between the beam flange and the through-diaphragm due to the stress concentration caused by the geometrical discontinuity. Accordingly, three improved types of through-diaphragm are presented in this paper to provide smooth force flow path comparing to that of conventional connections. Tensile tests were conducted on four specimens and the results were analyzed in terms of failure modes, load-displacement response, yield and ultimate capacity, and initial stiffness. Furthermore, strain distributions on the through-diaphragm, the beam flange plate, and the column face were comprehensively evaluated and discussed. It was found that all the proposed three types of improved through-diaphragm connections were able to reduce the stress concentration in the welds between the beam flange and the through-diaphragm. Furthermore, the stress distribution in connection with longer tapered through-diaphragm was more uniform. | ||
| Key Words | ||
| strain analysis; tensile performance; through-diaphragm; square tube column; load-displacement curve | ||
| Address | ||
| Ying Qin: 1) Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, and National Prestress Engineering Research Center, School of Civil Engineering, Southeast University, Nanjing, China 2) State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou, China Jing-Chen Zhang, Peng Shi, Yi-Fu Chen, Yao-Han Xu and Zuo-Zheng Shi: Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, and National Prestress Engineering Research Center, School of Civil Engineering, Southeast University, Nanjing, China | ||