Research on Compression Behavior of Square Thin-Walled CFST Columns with Steel-Bar Stiffeners

Yang, Zhao; Xu, Cheng

doi:10.3390/app8091602

Cited by 18 publications

(17 citation statements)

References 17 publications

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“…β = E/5000 (15) where, f (ξ), f (α) and f (β) are function of ξ, δ and β, respectively. Impact location is represented by L and impact energy is represented by E. The calculated and statistical results are presented in Table 6 and Figure 17.…”

Section: Calculation Formulamentioning

confidence: 99%

“…Bond strength of the CFST has been investigated by scholars [12,13]. The ultimate bearing capacity of the CFST under axial compressive load has been investigated by scholars [14][15][16]. Scholars also have investigated the behavior of tubular trusses and a new form of bolted connection with a precast reinforced concrete shear wall [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Behavior of Circular CFST Columns Subjected to Different Lateral Impact Energy

et al. 2019

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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.

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Section: Calculation Formulamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Behavior of Circular CFST Columns Subjected to Different Lateral Impact Energy

et al. 2019

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“…The corresponding amplitude function vectors were recognized as EAFV for further analysis. Next, the correlation coefficients were calculated, and the results support that χ 1 (1) can be selected as the standard reference since it has the biggest participation among the amplitude functions of the Dominant family. As shown in the third column of Table 1, the correlation coefficients |γ 1,i | = 1.0000 (i = 1, 2, 3, 4) indicate that amplitude functions of these PDM were collinear.…”

Section: Concrete Implementationmentioning

confidence: 88%

“…Thin-walled beams are widely used as structural components in weight-sensitive industrial applications, largely due to the advantage of high strength to weight ratio. However, they are also prone to cross-section deformation due to "thin walls", which may cast significant influences on the mechanical performance [1]. Therefore, it is essential to consider the phenomenon in the design process.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach to Perform the Identification of Cross-Section Deformation Modes for Thin-Walled Structures in the Framework of a Higher Order Beam Theory

Zhang

Zhu

2019

Applied Sciences

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This paper presents a novel approach to identify cross-section deformation modes for thin-walled structures by assembling preliminary deformation modes (PDM) considering their participation in free vibration modes. These PDM, defined over the cross-section through kinematic concepts, are integrated in the governing equations of a higher order model and then uncoupled in the form of generalized eigenvectors. The eigenvectors are deemed to inherit the attributes of structural behaviours and can serve as the basis to assemble PDM. Accordingly, a criterion was developed to handle the eigenvectors, pursuing (i) the clustering of PDM that participate in a same structural behaviour, (ii) the assignation of the corresponding weights that indicate their participation and (iii) the decomposition of an amplitude function when it is related to several structural behaviours. Moreover, a numbering system was proposed to hierarchically organize the deformation modes, which is conducive to a reduced higher order model. The main features of this approach are found in its ability to be performed in a more operational way and its nature to give deformation modes physical interpretation inherited from the dynamic behaviours. The versatility of the approach was validated through both numerical examples and comparisons with other theories.

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“…As an attractive composite structure, SRC column structure has the advantages of high load-bearing capacity, excellent seismic performance, and so on [1]. Worldwide, SRC structures have been widely used in the areas that are prone to earthquakes [2].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Research on Shear Strength of Seismic‐Damaged SRC Frame Columns Strengthened with Enveloped Steel Jackets

Sheng

Wan

2019

Advances in Civil Engineering

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The experimental and shear strength analytical investigations carried out on seismic-damaged steel reinforced concrete (SRC) columns strengthened with enveloped steel jacket subjected to cyclic loading are presented in this paper. Four 1/2-scale SRC columns were designed and manufactured and the postearthquake damage, enveloped steel jacket-confined, and destructive tests were carried out under lateral cyclic loading. The effects of postearthquake damage degree and enveloped steel jacket-confined on shear capacity and ductility capacity were all well examined. Test results indicate that the ductility of seismic-damaged SRC columns strengthened with enveloped steel jacket increases with the reduction of the postearthquake damage degree. The results indicate that the calculation formula of shear bearing capacity of SRC columns is feasible. Based on GB50010-2010, ACI318-08, and CSA-04, three different shear models were established, and the calculated values of shear capacity are quite different, and the analysis of the shear strength of RC in the strengthened seismic-damaged SRC column cannot be ignored. The formula is verified, and the calculated results are consistent well with the experimental results.

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Research on Compression Behavior of Square Thin-Walled CFST Columns with Steel-Bar Stiffeners

Cited by 18 publications

References 17 publications

Behavior of Circular CFST Columns Subjected to Different Lateral Impact Energy

Behavior of Circular CFST Columns Subjected to Different Lateral Impact Energy

A Novel Approach to Perform the Identification of Cross-Section Deformation Modes for Thin-Walled Structures in the Framework of a Higher Order Beam Theory

Experimental and Theoretical Research on Shear Strength of Seismic‐Damaged SRC Frame Columns Strengthened with Enveloped Steel Jackets

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