Improved Composite Effect of Square Concrete-Filled Steel Tubes with Diagonal Binding Ribs

Zhou, Zheng; Gan, Dan; Zhou, Xuhong

doi:10.1061/(asce)st.1943-541x.0002400

Cited by 61 publications

(16 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The steel plate of all specimens bulged slightly in the up or low end of columns, when the bearing capacity reached 80% of maximum load in the pre-peak loading stage. This was quite different from other researches which showed that the local buckling was observed in the stage of post-peak loading [5,6,9]. The probable reason was that the thickness of steel plate was quite smaller than that of other studies so that the inertial moment of the plate was tiny, and the plate was distinctly more comfortable to bugle.…”

Section: Resultscontrasting

confidence: 76%

Research on Bearing Capacity and Ductility of CFSST with Stiffeners

Sun¹,

Xu³

et al. 2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

In order to investigate the bearing capacity and ductility of concrete-filled square steel tubular (CFSST) with longitudinal stiffeners in condition of instant steel ratio, six specimens, including 1 CFSST, 3 CFSST with single stiffener and 2 CFSST with double stiffeners, were fabricated and tested. And the FEM was established and simulated by ANSYS. The experimental result showed that when the height-thickness ratio of stiffeners was increased, the bearing capacity would be generally decreased but the ductility could be improved. Besides, the specimens performed identical mechanical characteristics while the thickness of steel was the same. And the results of FEM were basically identical to the experiments. Finally, the confinement ξ played a key role to predict the bearing capacity.

show abstract

Section: Resultscontrasting

confidence: 76%

Research on Bearing Capacity and Ductility of CFSST with Stiffeners

Sun¹,

Xu³

et al. 2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Steel plates functioning as longitudinal stiffeners are placed inside square tubes to enhance the local buckling resistance and the interface shear capacity of CFTs (Gan et al, 2019; Zhou et al, 2019). In this study, steel plates were considered for developing a new type of shear connectors, and a pilot test was performed to identify the most effective configuration of the steel plates.…”

Section: Pilot Tests On Shear Connectorsmentioning

confidence: 99%

“…Composite columns consist of steel sections and concrete. Most configurations of composite columns include steel covered by concrete, which is designated as an encased composite column (Chen and Lin, 2009a;Chen et al, 2009bChen et al, , 2016Chen et al, , 2018Chen et al, , 2022Jamkhaneh et al, 2020), and steel tubes filled with concrete, which is designated as a concrete-filled tubular (CFT) columns (Ahmadi et al, 2017(Ahmadi et al, , 2018Furlong, 1967;Gan et al, 2019;Roeder et al, 1999aRoeder et al, , 1999bZhou et al, 2019). CFT columns are considered more economical than reinforced concrete columns (Furlong, 1967); therefore, it is essential to promote their usage.…”

Section: Introductionmentioning

confidence: 99%

New type of shear connector for square concrete-filled tubular columns

Chen

Zhang

2022

Advances in Structural Engineering

View full text Add to dashboard Cite

Concrete-filled tubes (CFT) are economical and easy to fabricate. As the cross-sections of CFTs are small, the interface shear between steel tube and concrete can be transferred by direct bond. As the cross-sectional dimension increases, shear connectors may be required to transfer the interface shear. However, welding shear connectors inside the steel tube is difficult. In this study, a new type of shear connector that could be installed from outside the steel tube was developed. A pilot test on five specimens demonstrated that the corner shear connector, which is a steel plate located at the corner of a square steel tube, at a 45° angle to the tube wall, is much superior to shear studs in terms of transferring the interfacial shear force. Furthermore, push-out tests of 18 CFT specimens were performed to investigate the strength and the behavior of the corner shear connectors. The strength of the specimens is found to be independent of the cross-sectional area of the shear connector. Instead, the jointed bearing area, which is defined as the cross-sectional area of the shear connection combining the area enclosed by the shear connector and the steel tube, is the major parameter that is closely correlated with the strength of the specimens. Furthermore, the ultimate strength of the specimens is positively correlated with the bearing distance, which is the distance between the loading point and the bearing surface of the connector. In addition, the strength of the corner shear connectors, which have a total jointed bearing area equaling 10.8% of the total concrete area in the steel tube, can adequately satisfy the strictest requirement for the shear transfer.

show abstract

“…The concrete core was in a three-way compression state due to the constraint effect of the steel tube, which effectively improves the compressive performance of the concrete and also improves the plasticity and toughness [1][2]. The concrete core can prevent premature local buckling of the steel tubes and ensure the full utilization of the material properties of steel tubes [3][4][5][6]. At the same time, compared with ordinary reinforced concrete piles, the size of the CFSTs is significantly reduced [1].…”

Section: Introductionmentioning

confidence: 99%

Strength Degradation Characteristics of the Steel-Concrete Interface Under Cyclic Shear

2022

Teh. vjesn.

View full text Add to dashboard Cite

The shear capacity of the steel-concrete interface (SCI) of concrete-filled steel tubular piles (CFSTs) degrades due to the cyclic shear action of external loading and unloading and can result in a reduction in the bearing capacity. To explore the shear strength degradation characteristics of the steel-concrete interface under cyclic shear, cyclic shear tests for three roughness types and under four different normal stresses were carried out by using a large-scale repeated direct shear test system. The characteristics of the shear load-displacement curve and failure mode of the SCI under external cyclic shear were analyzed, and the influence of the roughness and normal stress on the SCI shear strength degradation was explored. The results indicate that the CFSTs experienced shear failure in the first three shear cycles and then exhibited wear failure. The peak shear load of the SCI increases exponentially with increasing normal stress and decreases logarithmically with increasing cyclic shear time. A larger interfacial roughness and normal stress results in a faster interfacial shear strength ratio (τfn/τf1) weakening during the first three shear cycles, and with an increase of the cyclic shear times, the weakening rate is reduced.

show abstract

Improved Composite Effect of Square Concrete-Filled Steel Tubes with Diagonal Binding Ribs

Cited by 61 publications

References 22 publications

Research on Bearing Capacity and Ductility of CFSST with Stiffeners

Research on Bearing Capacity and Ductility of CFSST with Stiffeners

New type of shear connector for square concrete-filled tubular columns

Strength Degradation Characteristics of the Steel-Concrete Interface Under Cyclic Shear

Contact Info

Product

Resources

About