Article
Construction & Building Technology
Aref A. Abadel, M. Iqbal Khan, Radhouane Masmoudi
Summary: This study conducted numerical and experimental investigations on the compressive behavior of ultra-high-performance fiber-reinforced concrete (UHPFRC) columns under various confinement materials. The results showed that the outer steel tube had the best confinement effect on the core concrete, and all proposed confinement schemes significantly improved the ductility and energy absorption of the columns.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Engineering, Civil
Hong-Song Hu, Kang Lin, Bahram M. Shahrooz, Zi-Xiong Guo
Summary: This study innovatively measured the load components of circular CFST columns under axial compression, finding that although there were some differences in the load-deformation responses between innovative and traditional specimens, these differences were essentially insignificant. The development of hoop stresses in the steel tube tends to reduce the corresponding axial stresses, but this effect can be offset by the strain hardening of the steel tube.
ENGINEERING STRUCTURES
(2021)
Article
Chemistry, Physical
Bartosz Grzeszykowski, Elzbieta Danuta Szmigiera
Summary: This study examined the ductility of steel and composite concrete-filled steel tube (CFST) columns under axial compression. It found that the failure mode of the columns significantly affects their ductility. The ability to dissipate energy is the key factor that influences the ductility, with larger volumes of material deformity leading to greater ductility. Composite columns showed higher ductility than steel columns.
Article
Construction & Building Technology
Song Xia, Xinyi Wei, Chang He, Faxing Ding, Weizhen Zhang, Jiaye Wu, Sen Yang
Summary: This study investigates the effects of stirrup ratio and connection type of stirrups on the axial compression performance of stirrup-confined CFST stub columns through experiments and numerical modeling. The results show that stirrups significantly improve the axial compressive bearing capacity and ductility of CFST stub columns, with welded stirrups having a more pronounced impact.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Xi-Feng Yan, Siqi Lin, Mengnan He
Summary: So far, studies have focused on fully loaded CFDST columns, with limited research on partially loaded ones and their behavior differences. This paper conducts a comparative study on circular axially loaded CFDST columns, finding that partially loaded columns have greater ultimate strength at void ratios of 0 and 0.2, while fully loaded columns have greater strength at void ratios of 0.4 and 0.6. The study also develops a finite element analysis (FEA) model to determine the compressive behavior of CFDST columns with different loading arrangements.
Article
Construction & Building Technology
Li Xu, Jinlong Pan, Xiao Yang
Summary: This study investigated the mechanical performance of self-stressing CFST columns under uniaxial compression and proposed a calculation method. Experimental results showed that adding expansive agent significantly improved the load-bearing capacity of CFST columns, with the degree of improvement related to the initial self-stress.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Guo-Chang Li, Bo-Wen Chen, Bo-Wen Zhu, Zhi-Jian Yang, Han-Bin Ge, Yao-Peng Liu
Summary: In this study, the structural performance of axially loaded HCFSST columns was explored through experimental tests and numerical analysis. New design models for these columns were proposed and recommended. The findings of this study provide guidance for engineering practice of HCFSST columns.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Civil
Jingzhe Li, Qihan Shen, Jingfeng Wang, Yong Liu
Summary: This paper investigates the strengthening effectiveness of carbon fiber reinforced polymer (CFRP) on axially-loaded circular concrete-filled steel tubular (CFST) stub columns with spherical-cap gaps. A finite element model was established and validated, and the paper analyzes the effects of various parameters on the mechanical behavior of the columns. The results show that the spherical-cap gap weakened the mechanical behavior of the axially-loaded circular CFST stub column, but wrapping CFRP strips could repair or eliminate the adverse effects.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Shan Gao, Youchun Xu, Sumei Zhang, Anna Derlatka
Summary: A series of simulations were conducted to investigate the dynamic performances of square concrete-filled steel tubular (CFST) columns under repeated lateral impact considering the effects of common design parameters. The results indicated that the impact force response of square CFST columns with proper design under five lateral impacts was similar to that under single lateral impact. The failure mode of the specimen mainly presented overall bending failure. The energy absorption ratio decreased gradually with the increase of impact times. The plastic deformation of the tube served as the primary energy dissipation mechanism, thus the impact resistance of square CFST columns could be effectively enhanced by increasing steel yield strength, sectional steel ratio, and dimension.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Mizan Ahmed, Viet-Linh Tran, Junchang Ci, Xi-Feng Yan, Fangying Wang
Summary: This study develops a mathematical model to simulate the nonlinear performance of concrete-filled stainless steel tubular (CFSST) columns and investigates the sensitivities of important column parameters on their axial behavior. The accuracy of the existing confinement model and codified design models in predicting the performance and ultimate compressive strength of such columns is evaluated. An accurate artificial neural network (ANN) model with GUI feature is developed as a tool for design engineers to predict the ultimate axial strengths of CFSST columns.
Article
Construction & Building Technology
R. Manigandan, Manoj Kumara
Summary: This study investigated the structural performance of circular and elliptical CFDST columns under axial compression through three-dimensional finite element simulations and experimental data verification. The results showed that circular CFDST columns had better overall performance compared to elliptical CFDST columns.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Harpreet Singh, Aditya Kumar Tiwary
Summary: A novel stiffening scheme called diagonal stiffeners was proposed for unstiffened CFST columns, which improved their ultimate load capacity and behavior. Experimental and numerical analyses were conducted to investigate the response of diagonal stiffened CFST columns under axial compression. The results showed that the proposed stiffening arrangement increased the ultimate load capacity by 15-25% and improved the pre-peak and post-peak behavior of the columns. The local buckling of the outer steel casing was eliminated and the composite interaction between the outer steel casing and infill concrete was enhanced.
ENGINEERING STRUCTURES
(2023)
Article
Construction & Building Technology
Tong Li, Mingke Deng, Mengna Jin, Zhifang Dong, Yangxi Zhang
Summary: This study experimentally investigated the compressive behavior of masonry piers confined with Textile-reinforced high ductile concrete (TRHDC) jacket, compared to a reference set of fiber reinforced polymer (FRP) confined columns. It was found that TRHDC jacket can change the failure mode of columns and improve compressive strength, ultimate strain, and energy absorption capacity. Predictions from analytical models were in good agreement with experimental data, showing potential for engineering applications.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Weijie Li, Xiaobo Zhao, Yiyan Lu
Summary: This study developed a mechanism-based unified design formula for concrete-filled steel tubular (CFST) columns with various profiles. The study converted non-circle profiles into equivalent circle profiles and investigated the effects of corner radius and aspect ratio on confining stress. The formula was validated using a large database and addressed the inconsistency in the prediction results for different profiles according to different design codes.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2023)
Article
Engineering, Civil
G. E. Thermou, V. K. Papanikolaou, I Hajirasouliha
Summary: The study experimentally demonstrated the effectiveness of steel-reinforced grout (SRG) jacketing in substantially improving the overall structural performance of deficient reinforced concrete (RC) columns from brittle to ductile. The results highlighted the efficiency of SRG jacketing in modifying the response of columns with poor detailing, making them more resilient.
ENGINEERING STRUCTURES
(2021)