Experimental Study of Composite Hollow RC Column under Uniaxial Compressive Load
Abstract
:1. Introduction
2. Test Program
3. Test Results
3.1. Investigation of Test Results
3.2. Effect of Test Variables on Behavior of Column
3.2.1. Concrete Compressive Strength and Inner Tube Thickness
3.2.2. Hollow Ratio
3.2.3. Diameter of Column
3.2.4. Transverse Reinforcement Space
4. Summary and Conclusions
- The HSC column decreased rapidly after reaching its maximum strength. Its column models had different trends compared to those made of normal-strength concrete. Furthermore, this column had a bifurcation point. This phenomenon occurred due to the resistance after the buckling of the inner tube.
- Overall, the confining effect was negligible when high-strength concrete was applied to this column. In order to determine the confining effect of the normal-strength concrete column model, the lateral reinforcement is considered to be very important.
- This column was found to prevent rapid brittle fractures due to the inner tube. We hypothesized that the column would perform better when the buckling strength of the inner tube was increased.
Author Contributions
Funding
Conflicts of Interest
References
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Variables | No. | Name | Concrete Strength | Column Diameter | Outside Diameter of Inner Tube | Inner Tube Thickness | Transverse Reinforcement Space | Number of Longitudinal Reinforcements |
---|---|---|---|---|---|---|---|---|
Inner tube thickness | 1 | HSC-In.t_0.0 | 43.5 | 350 | 0 | 0 | 100 | 6 |
2 | HSC-In.t_1.0 | 43.5 | 350 | 165.2 | 1 | 100 | 6 | |
3 | HSC-In.t_3.0 | 43.5 | 350 | 165.2 | 3 | 100 | 6 | |
4 | HSC-In.t_6.0 | 43.5 | 350 | 165.2 | 6 | 100 | 6 | |
5 | HSC-In.Hoop_6 | 43.5 | 350 | 173.2 | 6 (inside hoop) | 100 | 6 | |
Hollow Ratio | 6 | HSC-H_0.36 | 43.5 | 350 | 139.8 | 6 | 100 | 7 |
7 | HSC-H_0.44 | 43.5 | 350 | 165.2 | 6 | 100 | 7 | |
8 | HSC-H_0.51 | 43.5 | 350 | 190.7 | 6 | 100 | 6 | |
9 | HSC-H_0.58 | 43.5 | 350 | 216.3 | 6 | 100 | 6 | |
Column diameter | 10 | HSC-D_300 | 43.5 | 300 | 165.2 | 6 | 100 | 4 |
11 | HSC-D_350 | 43.5 | 350 | 190.7 | 6 | 100 | 6 | |
12 | HSC-D_400 | 43.5 | 400 | 216.3 | 6 | 100 | 8 | |
13 | HSC-D_450 | 43.5 | 450 | 267.4 | 6 | 100 | 9 | |
Space of hoop rebar | 14 | HSC-HS_80 | 43.5 | 350 | 165.2 | 6 | 80 | 6 |
15 | HSC-HS_100 | 43.5 | 350 | 165.2 | 6 | 100 | 6 | |
16 | HSC-HS_130 | 43.5 | 350 | 165.2 | 6 | 130 | 6 | |
17 | HSC-HS_150 | 43.5 | 350 | 165.2 | 6 | 150 | 6 | |
Inner tube thickness; normal-strength concrete | 18 | NSC-In.t_0.0 | 17.2 | 350 | 0 | 0 | 100 | 6 |
19 | NSC-In.t_1.0 | 17.2 | 350 | 165.2 | 1 | 100 | 6 | |
20 | NSC-In.t_3.0 | 17.2 | 350 | 165.2 | 3 | 100 | 6 | |
21 | NSC-In.t_6.0 | 17.2 | 350 | 165.2 | 6 | 100 | 6 | |
22 | NSC-In.Hoop_6 | 17.2 | 350 | 173.2 | 6 (inside hoop) | 100 | 6 |
Specimens | Qualitative Analysis of Experimental Results | ||
---|---|---|---|
High-Strength Concrete | Inner tube thickness | HSC-In.t_0.0 | Occurrence of crack on end side due to steel sheet not reinforced. Buckling of longitudinal reinforcement due to loose reinforcement packing. |
HSC-In.t_1.0 | Occurrence of crack in center of column. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. | ||
HSC-In.t_3.0 | Occurrence of 45° crack in the axial direction. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. | ||
HSC-In.t_6.0 | Occurrence of 45° crack in the axial direction. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. | ||
HSC-In.Hoop_6 | Buckling of longitudinal reinforcement by loose reinforcement packing. | ||
Hollow ratio | HSC-H_0.36 | Occurrence of crack in center of column. Buckling of longitudinal reinforcement and steel inner tube by loose reinforcement packing. | |
HSC-H_0.44 | Occurrence of crack in center of column. Buckling of longitudinal reinforcement and steel inner tube by loose reinforcement packing. | ||
HSC-H_0.51 | Occurrence of 45° crack in the axial direction. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. | ||
HSC-H_0.58 | Occurrence of 45° crack in the axial direction. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. | ||
Diameter of column | HSC-D_300 | Buckling of longitudinal reinforcement and steel inner tube by loose reinforcement packing in upper side from center. | |
HSC-D_350 | Buckling of longitudinal reinforcement and steel inner tube by loose reinforcement packing in upper side from center. | ||
HSC-D_400 | Occurrence of 45° crack in the axial direction. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. | ||
HSC-D_450 | Occurrence of 45° crack in the axial direction. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. | ||
Transverse reinforcement space | HSC-HS_80 | Occurrence of 45° crack in the axial direction. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. | |
HSC-HS_100 | Occurrence of 45° crack in the axial direction. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. | ||
HSC-HS_130 | Occurrence of 45° crack in the axial direction. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. | ||
HSC-HS_150 | Buckling of longitudinal reinforcement and steel inner tube due to wide transverse reinforcement spaces. | ||
Normal Strength Concrete | Inner tube thickness | NSC-In.t_0.0 | Occurrence of crack in center of column. Buckling of longitudinal reinforcement and steel inner tube by loose reinforcement packing. |
NSC-In.t_1.0 | Occurrence of 45° crack in the axial direction. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. | ||
NSC-In.t_3.0 | Occurrence of 45° crack in the axial direction. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. | ||
NSC-In.t_6.0 | Occurrence of 45° crack in the axial direction. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. | ||
NSC-In.Hoop_6 | Occurrence of 45° crack in the axial direction. Buckling of longitudinal reinforcement and steel inner tube by yielding of reinforcement. |
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Won, D.; Kim, S.; Seo, J.; Kang, Y.-J. Experimental Study of Composite Hollow RC Column under Uniaxial Compressive Load. Appl. Sci. 2019, 9, 373. https://doi.org/10.3390/app9030373
Won D, Kim S, Seo J, Kang Y-J. Experimental Study of Composite Hollow RC Column under Uniaxial Compressive Load. Applied Sciences. 2019; 9(3):373. https://doi.org/10.3390/app9030373
Chicago/Turabian StyleWon, Deokhee, Seungjun Kim, Jihye Seo, and Young-Jong Kang. 2019. "Experimental Study of Composite Hollow RC Column under Uniaxial Compressive Load" Applied Sciences 9, no. 3: 373. https://doi.org/10.3390/app9030373
APA StyleWon, D., Kim, S., Seo, J., & Kang, Y.-J. (2019). Experimental Study of Composite Hollow RC Column under Uniaxial Compressive Load. Applied Sciences, 9(3), 373. https://doi.org/10.3390/app9030373