Effect of Long-Term Loading on Deformation and Bearing Capacity of Steel Tube-Constrained Composite Columns

LI Yanhua; ZHANG Sumei; WANG Yan; WANG Yuyin

doi:10.13204/j.gyjzG21120112

Volume 53 Issue 1

Jan. 2023

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LI Yanhua, ZHANG Sumei, WANG Yan, WANG Yuyin. Effect of Long-Term Loading on Deformation and Bearing Capacity of Steel Tube-Constrained Composite Columns[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(1): 151-159,19. doi: 10.13204/j.gyjzG21120112

Citation:

LI Yanhua, ZHANG Sumei, WANG Yan, WANG Yuyin. Effect of Long-Term Loading on Deformation and Bearing Capacity of Steel Tube-Constrained Composite Columns[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(1): 151-159,19. doi: 10.13204/j.gyjzG21120112

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Effect of Long-Term Loading on Deformation and Bearing Capacity of Steel Tube-Constrained Composite Columns

doi: 10.13204/j.gyjzG21120112

1. Civil and Environmental Engineering, Harbin Institute of Technology(Shenzhen), Shenzhen 518000, China;
2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China

Received Date: 2021-12-01
Available Online: 2023-05-25
Publish Date: 2023-01-20

Abstract

Abstract

12 steel-tube-confined concrete-filled steel tube columns(TCFST), 6 tubed reinforced concrete columns (TRC) and 9 tubed steel reinforced concrete columns(TSRC) were designed to study the effect of long-term loading on the deformation and bearing capacity. Among them,8 TCFST, 6 TSRC and 4 TRC short columns were loaded for a total of 760 days. Then the axial compression tests were conducted on all the above columns. The main concerned parameters were concrete strength grade (C50 and C70), and core concrete ages at the time of loading application (7 d, 14 d and 28 d). The long-term deformation properties of the columns and the influence of 760-day sustained loading on their mechanical properties were compared and analyzed. The results showed that: 1) the long-term deformation of the three types of short columns occurred mainly in the early stage of the loading, showing a rapid increase in the early stage and a gradual slowdown in the later stage. The long-term deformation of the TCFST columns was the smallest comparing with the other two; 2) the low-stress long-term loading, long-term deformation of core concrete, as well as interlayer concrete had almost no effect on the bearing capacity of the columns under axial compression; the type of specimens, loading age and concrete strength grade had little effect on the bearing capacity; 3) the column failure modes were not influenced by the existence of long-term loading. TSRC columns and TRC columns showed an obvious shear failure, while the TCFST columns with loading in early age or moderate concrete strength grade occurred ductile squash failure.
- long-term loading,
- steel tube-constrained composite columns,
- long-term defermation,
- shrinkage and creep,
- bearing capacity,
- axial compressive test

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References(29)

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