Research on Mechanical Properties of UHPC Encased CFSTs Under Eccentrically Compressive Loading

YANG Yuxing; LIAO Feiyu; CHEN Yufeng; WANG Jingfeng; YE Hongming; WANG Ying

doi:10.3724/j.gyjzG24022108

Volume 54 Issue 11

Nov. 2024

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YANG Yuxing, LIAO Feiyu, CHEN Yufeng, WANG Jingfeng, YE Hongming, WANG Ying. Research on Mechanical Properties of UHPC Encased CFSTs Under Eccentrically Compressive Loading[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(11): 121-128. doi: 10.3724/j.gyjzG24022108

Citation:

YANG Yuxing, LIAO Feiyu, CHEN Yufeng, WANG Jingfeng, YE Hongming, WANG Ying. Research on Mechanical Properties of UHPC Encased CFSTs Under Eccentrically Compressive Loading[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(11): 121-128. doi: 10.3724/j.gyjzG24022108

Citation:

YANG Yuxing, LIAO Feiyu, CHEN Yufeng, WANG Jingfeng, YE Hongming, WANG Ying. Research on Mechanical Properties of UHPC Encased CFSTs Under Eccentrically Compressive Loading[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(11): 121-128. doi: 10.3724/j.gyjzG24022108

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Research on Mechanical Properties of UHPC Encased CFSTs Under Eccentrically Compressive Loading

doi: 10.3724/j.gyjzG24022108

1. College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China;
2. Fujian Construction Engineering Group Company, Fuzhou 350003, China;
3. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China;
4. College of Civil Engineering, Fuzhou University, Fuzhou 350116, China

Received Date: 2024-02-21
Available Online: 2024-12-05

Abstract

Abstract

Ultral-high-performance concrete (UHPC) encased concrete-filled steel tubes (CFST) have advatages such as superior durability and high bearing capacity.Four CFST columns with varying eccentricity and slenderness ratios were experimentally tested to examine their mechanical properties.Based on the test results,the failure characteristics, load-deformation responses, ultimate eccentric bearing capacity, second-order effects, and ductility were investigated. The results revealed that the incorporation of steel fibers significantly reduced the failure degree of the outer UHPC, while the inner CFST offered the column specimens good ductility. It was noted that the eccentric bearing capacity decreased markedly with the increasing eccentricity, particularly in the range of 0-80 mm. Moreover, second-order effects had a substantial impact on the eccentric bearing capacity, contributing up to 36.5% of the total moment as eccentricity and slenderness ratio increased. The study’s findings were used to discuss the applicability of existing code provisions for calculating the eccentric bearing capacity of UHPC encased CFST columns.
- UHPC encased,
- CFST,
- composite member,
- eccentrically compressive loading

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References(26)

References

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