PSEUDO-STATIC TESTS OF STIRRUP-CONFINED SQUARE CFST TWO-STORY TWO-SPAN COMPOSITE FRAME STRUCTURE

DING Fa-xing; XU Yun-long; WANG Li-ping; YIN Guo-an; YU Zhi-wu

doi:10.6052/j.issn.1000-4750.2021.09.0693

Volume 40 Issue 4

Apr. 2023

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Engineering Mechanics > 2023 > 40(4): 58-70. > DOI: 10.6052/j.issn.1000-4750.2021.09.0693

DING Fa-xing, XU Yun-long, WANG Li-ping, YIN Guo-an, YU Zhi-wu. PSEUDO-STATIC TESTS OF STIRRUP-CONFINED SQUARE CFST TWO-STORY TWO-SPAN COMPOSITE FRAME STRUCTURE[J]. Engineering Mechanics, 2023, 40(4): 58-70. DOI: 10.6052/j.issn.1000-4750.2021.09.0693

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PSEUDO-STATIC TESTS OF STIRRUP-CONFINED SQUARE CFST TWO-STORY TWO-SPAN COMPOSITE FRAME STRUCTURE

DING Fa-xing^{1, 2,},
XU Yun-long^1, ,,
WANG Li-ping^{1, 2,},
YIN Guo-an^3,,
YU Zhi-wu^{1, 2,}

1.
School of Civil Engineering, Central South University, Changsha, Hu’nan 410075, China
2.
Engineering Technology Research Center for Prefabricated Construction Industrialization of Hu’nan, Changsha, Hu’nan 410075, China
3.
School of Civil Engineering and Architecture, LinYi University, Linyi, Shandong 276000, China

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Received Date: September 04, 2021
Revised Date: December 10, 2021
Accepted Date: December 16, 2021
Available Online: December 16, 2021

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Abstract

Abstract

An experimental study on two two-story-two-span CFST frames with or without internal stirrups subjected to horizontal cyclic loading was conducted. The frame specimens were scaled down to 2∶5. The objective of this study is to investigate the influence of stirrups welded inside the CFST columns on the aseismic performance of the frames. Numerical analysis was carried out using ABAQUS, and the finite element model was verified by comparing the test results. Based on the FE models, the influence of the equivalent stirrup ratio was investigated. The experimental and numerical analysis results indicate that the stirrups reduce the slippage between steel tube and infilled concrete and, strengthen the confinement effect of steel tube on infilled concrete at same time. Moreover, the flexural bearing capacity and energy dissipation capacity of the frames were improved. The stirrups also change the ratio of line stiffness and flexural bearing capacity between beam and column indirectly. Compared with the conventional frames, the frames designed using ‘strong columns’ can improve the stiffness, bearing capacity and energy dissipation capacity of the frames by more than 70%, 20% and 50%, respectively.
- steel-concrete composite frame,
- stirrup-confined,
- seismic performance,
- equivalent stirrup ratio,
- energy dissipation capacity

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References

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PSEUDO-STATIC TESTS OF STIRRUP-CONFINED SQUARE CFST TWO-STORY TWO-SPAN COMPOSITE FRAME STRUCTURE

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