Behavior of Circular CFST Columns Subjected to Different Lateral Impact Energy

Abstract

Forty-eight circular concrete-filled steel tube (CFST) columns subjected to lateral impact were tested to investigate the behavior of circular CFST columns under axial compressive load. Analyses of effects of concrete compressive strength, impact location and impact energy on residual ultimate axial capacity, ductility and initial stiffness are provided in this paper. It is found that lateral impact has negative effects on residual ultimate axial capacity of circular CFST columns from test results. Residual ultimate axial capacity decreases as impact energy increases and impact location comes close to the end of the specimen. It is also found that increasing concrete compressive strength can reduce the negative effects of impact location on residual ultimate axial capacity. Ductility and the initial stiffness of circular CFST columns decrease as impact energy increases. Ductility and the initial stiffness increase as impact location varies from middle-length to the end of specimens. When impact energy and impact location are constant, the ductility of the specimen with 30 MPa of concrete compressive strength is better than that of other specimens with different compressive strength. Besides, analyses of strain developments for 12 typical specimens to investigate failure modes under axial compressive load are provided in this paper. Strain developments have indicated that the steel at impact location becomes plastic faster than that at other locations. Based on the test results, a calculation formula is presented to predict the residual ultimate axial capacities of circular CFST columns subjected to lateral impact, and good agreement with experimental results has been achieved.

Editorial for Special Issue “Energy Dissipation and Vibration Control: Materials, Modeling, Algorithm, and Devices”

“…This special issue also reports other types of new energy dissipation devices, such as a multi-unit particle damper [34], a nonlinear eddy current damper [35], and layered dampers [36,37]. Furthermore, also reported in this issue are structural elements with innovative designs to dissipate energy [38][39][40]. In addition, this special issue also reports two research studies on the dynamic responses of a structural foundation [41] and an earth-retaining structure [42].…”

“…In summary, the topics in the special issue include new damping materials development [37], new damper vibration modeling, novel algorithms for active vibration control [44,45], novel passive damping methods and devices [25][26][27][28][29][30], innovative energy dissipation devices [38][39][40], and an explorative characterization of materials for energy dissipation [33], among others. For the future trends of research in energy dissipation for vibration control, two avenues should be noted.…”

Behaviour of CFST Stub Columns Subjected to Pure Compression

“…Steel tubes filled with concrete are characterised by using a variety of materials (normal strength materials (Abramski, 2018;Zhang et al, 2019), high-strength materials (Yan et al, 2019(Yan et al, , 2021a, fibre-reinforced concrete (Tretyakov et al, 2021), self-compacting concrete (Huang et al, 2022;Li et al, 2020), stainless steel (He et al, 2021;Ye et al, 2021), etc.) and cross-sectional shapes (circular (Avci-Karatas, 2019, 2021Han et al, 2014), elliptical (Ren et al, 2014), polygonal (Hassanein et al, 2017, etc.…”

Detection of Gaps in Concrete–Metal Composite Structures Based on the Feature Extraction Method Using Piezoelectric Transducers

“…The interaction between the steel surface and concrete delays the local buckling of steel tube and the confinement from the metal increases the strength of concrete. This interaction also reduces the drying shrinkage and deterioration of concrete [5,6]. However, factors such as shrinkage of concrete, temperature variations and poor construction quality lead to debonding and gap formation between metal and concrete surface [7].…”