Study of the Axial Compressive Behaviour of Cross-Shaped CFST and ST Columns with Inner Changes

Tao, Zhong; Hasan, Md Mehedi; Han, Dingpei; Qin, Qiudong; Ghafar, Wahab Abdul

doi:10.3390/buildings13020423

Cited by 6 publications

(3 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nowadays, it is widely accepted that this solution has several relevant structural and non-structural advantages. The structural gains have been verified both with testing [1][2][3][4][5][6] and numerical simulation [7][8][9][10]. Regarding structural issues, the main benefit of CFST is the confinement effect of the concrete by the steel tube; therefore, transverse (hoop) prestressing might provide even greater and adaptive confinement.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Axial-Flexural Behavior of CFST Columns with Active Transverse Prestressing

Hu,

Albareda,

et al. 2023

Buildings

View full text Add to dashboard Cite

This paper presents a numerical study on the vertical (axial) and lateral (flexure) behavior of CFST (Concrete-Filled Steel Tube) columns with active hoop prestress achieved by bolting together two steel half-tubes. Twelve prototype CFST column specimens differing in the prestressing force (three levels) and in the gravity loading ratio (four levels) are analyzed; they are selected to represent typical ground columns of mid-rise buildings. Their structural behavior is simulated with a nonlinear model implemented in Abaqus; concrete and steel behavior are described with a damage-plasticity and a plasticity model, respectively. The concrete-steel interaction is represented by a hard (compression-only) surface-to-surface contact model. The calculations involve three consecutive loading steps: (i) transverse prestress, (ii) axial force, and (iii) lateral loading (shear force and bending moment). The calculation results show that the axial-flexural capacity of the prototype CFST columns is adequate. However, the hoop prestress benefit on axial compressive performance is not outstanding because the tube transverse Poisson expansion impairs the concrete confinement. The benefit in the flexural performance is smaller, due to the lack of sectional lateral expansion during bending. Preliminary studies on mid-rise buildings equipped with the prototype CFST columns show that their gravity and wind capacities are largely enough; conversely, their seismic strength is sufficient only for moderate earthquakes.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Axial-Flexural Behavior of CFST Columns with Active Transverse Prestressing

Hu,

Albareda,

et al. 2023

Buildings

View full text Add to dashboard Cite

show abstract

“…Additionally, some scholars [10][11][12][13][14][15] have used vertical steel plates, angled steel, or open-hole steel plates to strengthen the bending rigidity of the steel plate section in order to achieve the common working effect of steel tubes and core concrete. Han Linhai [16], Tao Zhong [17], Cheng Rui [18], Tu Yongqing [19,20], and Zheng Yongqian [21] adopted a multi-cell form to eliminate the adverse effects of the concave corners of special-shaped CFST columns. The measures can improve the bearing capacity and ductility of special-shaped steel tube concrete columns to some extent, but there are also some issues, such as the complexity of the processing technology, the uneven side wall of the steel tube, and the insufficient improvement of the component's ductility.…”

Section: Introductionmentioning

confidence: 99%

Axial Compressive Behavior of Cross-Shaped CFST Stub Columns with Steel Bar Truss Stiffening

Gong

et al. 2023

Materials

View full text Add to dashboard Cite

Concrete-filled steel tube (CFST) columns have been widely used in residential buildings due to their high bearing capacity, good ductility, and reliable seismic performance. However, conventional circular, square, or rectangular CFST columns may protrude from the adjacent walls, resulting in inconvenience in terms of the arrangement of furniture in a room. In order to solve the problem, special-shaped CFST columns, such as cross-shaped, L-shaped, and T-shaped columns, have been suggested and adopted in engineering practice. These special-shaped CFST columns have limbs with the same width as the adjacent walls. However, compared with conventional CFST columns, the special-shaped steel tube provides weaker confinement to the infilled concrete under axial compressive load, especially at concave corners. The parting at concave corners is the key factor affecting the bearing capacity and ductility of the members. Therefore, a cross-shaped CFST column with steel bar truss stiffening is suggested. In this paper, 12 cross-shaped CFST stub columns were designed and tested under axial compression loading. The effects of steel bar truss node spacing and column–steel ratio on the failure mode, bearing capacity, and ductility were discussed in detail. The results indicate that the columns with steel bar truss stiffening can change the final deformation mode of the steel plate from single-wave buckling to multiple-wave buckling, and the failure modes of columns also subsequently change from single-section concrete crushing failure to multiple-section concrete crushing failure. The steel bar truss stiffening shows no obvious effect on the axial bearing capacity of the member but significantly improves the ductility. The columns with a steel bar truss node spacing of 140 mm can only increase the bearing capacity by 6.8% while nearly doubling the ductility coefficient from 2.31 to 4.40. The experimental results are compared with those of six design codes worldwide. The results show that the Eurocode 4 (2004) and the Chinese code CECS159-2018 can be safely used to predict the axial bearing capacity of cross-shaped CFST stub columns with steel bar truss stiffening.

show abstract

“…While previous research has primarily centered on single-form composite L-shaped columns with similar leg lengths, there has been limited exploration of dissimilar-leg special-shaped CFST columns [4][5][6][7]. While some experimental studies have delved into the seismic performance of L-shaped CFST columns, they have generally found them to exhibit favorable seismic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Seismic Performance of L-Shaped CFST Columns in Different Combinations

Han,

Tao,

Abdul Ghafar

et al. 2023

Buildings

Self Cite

View full text Add to dashboard Cite

L-shaped concrete-filled steel tubular (CFST) columns represent a valuable structural element with an L-shaped cross-section, primarily employed in the corner columns of framed structures. These columns offer several advantages, including space efficiency by avoiding column protrusion, robust mechanical properties, high load-bearing capacity, ductility, and efficient utilization of internal building space. This article presents the outcomes of an experimental investigation into the seismic behavior of L-shaped CFST columns. The experimental study investigated the seismic performance of nine L-shaped CFST columns while considering different cross-sectional dimensions, their combinations, and varying levels of confinement. The results obtained from this study indicate that L-shaped CFST columns possess favorable seismic performance characteristics. However, there exists the potential for significant improvement by modifying certain parameters. Enhancements in seismic performance were observed when increasing the cross-sectional dimensions of the column and the length of its legs. The use of steel tubes and the provision of adequate confinement also demonstrated notable benefits. Moreover, the better arrangement of steel tubes within the column positively influenced seismic performance. These findings can potentially inform and enhance the design of L-shaped CFST columns, rendering them more resilient to seismic forces.

show abstract

Study of the Axial Compressive Behaviour of Cross-Shaped CFST and ST Columns with Inner Changes

Cited by 6 publications

References 28 publications

Numerical Analysis of the Axial-Flexural Behavior of CFST Columns with Active Transverse Prestressing

Numerical Analysis of the Axial-Flexural Behavior of CFST Columns with Active Transverse Prestressing

Axial Compressive Behavior of Cross-Shaped CFST Stub Columns with Steel Bar Truss Stiffening

Experimental Study on the Seismic Performance of L-Shaped CFST Columns in Different Combinations

Contact Info

Product

Resources

About