EXPERIMENTAL RESEARCH ON INTERFACE BOND PERFORMANCES BETWEEN LSAW STEEL PIPES AND CONCRETE

LUO Peiyun; LEI Yongwang; ZHU Binrong; ZHAO Weiping

doi:10.13204/j.gyjzG20052008

Volume 51 Issue 3

Jul. 2021

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2021 > 51(3): 77-84

GUO Qiusheng. CAPILLARY WATER ABSORPTION CHARACTERISTICS OF CONCRETE AND ITS RELATIONSHIP WITH PORE STRUCTURE[J]. INDUSTRIAL CONSTRUCTION, 2020, 50(3): 119-123. doi: 10.13204/j.gyjz202003020

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LUO Peiyun, LEI Yongwang, ZHU Binrong, ZHAO Weiping. EXPERIMENTAL RESEARCH ON INTERFACE BOND PERFORMANCES BETWEEN LSAW STEEL PIPES AND CONCRETE[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(3): 77-84. doi: 10.13204/j.gyjzG20052008

GUO Qiusheng. CAPILLARY WATER ABSORPTION CHARACTERISTICS OF CONCRETE AND ITS RELATIONSHIP WITH PORE STRUCTURE[J]. INDUSTRIAL CONSTRUCTION, 2020, 50(3): 119-123. doi: 10.13204/j.gyjz202003020

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EXPERIMENTAL RESEARCH ON INTERFACE BOND PERFORMANCES BETWEEN LSAW STEEL PIPES AND CONCRETE

doi: 10.13204/j.gyjzG20052008

1. Department of Architecture Engineering, Yantai Vocational College, Yantai 264670, China;
2. School of Mechanics and Civil Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China;
3. China Electric Power Research Institute, Beijing 100192, China

Received Date: 2020-05-20
Available Online: 2021-07-17

Abstract

Abstract

In structure design of concrete-filled steel tube (CFST) structure of long-span transmission towers, the higher requirements were put forward for the interface bond performance. To study the interface bond performances between LSAW(longitudinally Submerged Arc Welding) steel pipes and concrete, push-out tests based on orthogonal test principles were conducted on nine CFST specimens. The bond mechanisms and distribution laws of bond stress between LSAW steel pipes and concrete were studied. The main and secondary relations and influencing laws of parameters on the bond strength were analyzed. The optimized empirical formulas of bond strength were proposed based on the analysis of orthogonal tests. Test results indicated that curves of bond stress and slip consisted of the adhesive stage, nonlinear initial sliding stage and sliding stage. All curves had a similar rising tendency at the adhesive stage and nonlinear initial sliding stage. And there were three kinds of tendencies at sliding stage, namely, type I-1, Ⅰ-2 and Ⅱ. The type I-1 curve firstly decreased and then kept it stable. The type Ⅰ-2 curve firstly decreased and then possessed a secondary rising branch. The type II curve continued to ascend slowly at the sliding stage. Three kinds of curve tendencies were mainly caused by macro-manufacturing deviations of the LSAW steel pipes. The factors that influenced adhesive strength and ultimate bond strength both were in order of diameter-thickness ratio of steel pipes, concrete strength and interface bond length in terms of importance. The adhesive strength and ultimate bond strength bothdecreased significantly with the increase of diameter-thickness ratios of steel pipes, but increased with the increase of concrete strength. The bond stress at two ends of specimens decreased with the increase of loads, which revealed the failure mechanism that interface peeled off from the both ends to the middle part. A comparison with other literatures verified that the optimized calculation formulas of bond strength had reliability.
- LSAW steel pipe,
- bond performance,
- push-out test,
- bond stress-slip curve,
- bond strength

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References(22)

References

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