Vol. 21, No. 6, pp. 551-560 (2025)
ESTIMATION OF DEFORMATION CAPACITY OF CIRCULAR
HOLLOW SECTION BASED ON STRAIN
Heng-Li Fu 1, 2, Gan-Ping Shu 1, 2, *, Jin Zhang 3, Bao-Feng Zheng 1, 2, Li-Bo Wang 1, 2 and Zhan-Peng Chen 1, 2
1 Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,
Southeast University, Nanjing 210096, China
2 School of Civil Engineering, Southeast University, Nanjing 210096, China
3 ARTS Group Co., Ltd., Suzhou 215123, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 21 April 2025; Revised: 21 May 2025; Accepted: 26 May 2025
DOI:10.18057/IJASC.2025.21.6.8
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ABSTRACT
The deformation evaluation of steel members is an important part of the performance-based seismic design of steel structures. The strain-based deformation capacity is not susceptible to load and boundary conditions, and can directly reflect the ductility of the component. According to the mechanical properties of steel circular hollow section (CHS) beam-columns in engineering structures, this paper proposes a strain-based ductility coefficient derived from the equivalent plastic zone to estimate their deformation capacity. Six typical circular hollow section steel components were subjected to quasi-static tests, with different diameter-to-thickness ratio and axial compression ratio as the test parameters. Based on the experimental results, a validated and reliable finite element model was established to analyze the effects of various factors on the strain ductility coefficient of steel circular hollow sections under quasi-static loading. The results indicated that the strain ductility coefficient decreased with increasing diameter-to-thickness ratio and axial compression ratio. A recommended empirical formula for the strain ductility coefficient of circular hollow section beam-columns was proposed using regression analysis. The empirical formula has high accuracy, serving as a reference for promoting the application of performance-based seismic design in steel structures.
KEYWORDS
Quasi-static test, Circular hollow section, Strain ductility coefficient, Performance-based seismic design
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