Vol. 16, No. 1, pp. 1-12 (2020)
MECHANICAL PERFORMANCE OF WELDED HOLLOW SPHERICAL JOINTS AT
ELEVATED TEMPERATURES
Hong-bo Liu1,3,4*, Ying-jie Zhang3, Lan Wang2, Zhi-hua Chen1,3,4
1 State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China
2 Tianjin Fire Research Institute of MEM, Tianjin 300000, China
3 Department of Civil Engineering, Tianjin University, Tianjin 300072, China
4 Key Laboratory of Coast Civil Structure and Safety, Ministry of Education (Tianjin University), Tianjin 300072, China
* (Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 11 March 2019; Revised: 11 August 2019; Accepted: 14 September 2019
DOI:10.18057/IJASC.2020.16.1.1
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ABSTRACT
Welded hollow spherical joints (WHSJs) have been extensively applied to spatial grid structures. However, the failure mechanism and assessment method of WHSJs under fire conditions have been rarely studied. In this study, the failure mechanism and high-temperature attenuation pattern of the axial compression performance of WHSJs at fire-induced high temperatures were explored via high-temperature axial compression experiments by using 18 specimens. A finite element (FE) model was constructed by using the ABAQUS software. The reliability of this FE model was verified by experimental results. The influencing patterns of the type of steel, stiffening rib arrangement, size of the WHSJ, and the test temperature on the high-temperature axial compression performance of WHSJs were discussed through the FE model. A simplified calculation method of the compressive bearing capacity of WHSJs at elevated temperatures was proposed on the basis of the test data and the FE parameterized analysis results. The findings of the simplified calculation method conformed to experimental and numerical simulation results.
KEYWORDS
Welded hollow spherical joint, Under fire, Axial compression experiment, Compressive bearing capacity, Initial axial stiffness, High-temperature attenuation mecha-nism
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