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Steel and Composite Structures Volume 50, Number 3, February 10 2024 , pages 265-280 DOI: https://doi.org/10.12989/scs.2024.50.3.265 |
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Difference analysis of the collapse behaviors of the single-story beam-column assembly and multi-story planar frame |
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Zheng Tan, Wei-Hui Zhong, Bao Meng, Xing-You Yao, Yu-Hui Zheng, Yao Gao and Shi-Chao Duan
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| Abstract | ||
| The collapse behavior observed in single-story beam-column assembly (SSBCA) do not accurately represent the actual overall stress characteristic of multi-story frame structure (MSFS) under column loss scenario owing to ignoring the interaction action among different stories, leading to a disconnection between the anti-collapse behaviors of "components" and "overall structures", that is, the anti-collapse performance of frame structures with two different structural scales has not yet formed a combined force. This paper conducts a numerical and theoretical study to explore the difference of the collapse behaviors of the SSBCA and MSFS, and further to reveal the internal force relationships and boundary constraints at beam ends of models SSBCA and MSFS. Based on the previous experimental tests, the corresponding refined numerical simulation models were established and verified, and comparative analysis on the resistant-collapse performance was carried out, based on the validated modeling methods with considering the actual boundary constraints, and the results illustrates that the collapse behaviors of the SSBCA and MSFS is not a simple multiple relationship. Through numerical simulation and theoretical analysis, the development laws of internal force in each story beam under different boundary constraints was clarified, and the coupling relationship between the bending moment at the most unfavorable section and axial force in the composite beam of different stories of multi story frames with weld cover-plated flange connections was obtained. In addition, considering the effect of the yield performance of adjacent columns on the anti-collapse bearing capacities of the SSBCA and MSFS during the large deformation stages, the calculation formula for the equivalent axial stiffness at the beam ends of each story were provided. | ||
| Key Words | ||
| collapse performance; difference analysis; equivalent axial stiffness; internal force relationship | ||
| Address | ||
| Zheng Tan:School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China Wei-Hui Zhong:Key Laboratory of Structural Engineering and Earthquake Resistance, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China Bao Meng:1)School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 2)Department of Civil and Environmental Engineering, National University of Singapore, 119077, Singapore Xing-You Yao:Jiangxi Province Key Laboratory of Hydraulic and Civil Engineering Infrastructure Security, Nanchang Institute of Technology, Nanchang, 330000, China Yu-Hui Zheng:School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China Yao Gao:School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China Shi-Chao Duan:School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China | ||