Lateral Impact Response of Concrete-Filled Square Steel Tubes with Local Defects

Wang, Yulin; Gao, Shan; Xu, Youchun; Li, Fangyi

doi:10.3390/buildings12070996

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…The constraint effect coefficient can reflect the confinement effect of external steel tubes on core concrete. It is mainly affected by four factors, namely steel yield strength, concrete compressive strength, steel tube sectional area, and core concrete sectional area, and its expression is shown in Equation (3). In order to study the influence of confinement effect coefficients on the axial compression performance of CFHST short columns, four models with different constraint effect coefficients are analyzed in Table 5, and their confinement effect coefficients are 0.29, 0.57, 1.12, and 1.78, respectively.…”

Section: Effect Of Confinement Effect Coefficientmentioning

confidence: 99%

“…With the improvement of the development level of high-strength (HS) steel, it has been gradually promoted and applied in CFST structures to enhance their compressive capacity [3,4]. Moreover, for concrete-filled high-strength steel tube (CFHST) structure, HS steel tube can provide a stronger confinement effect for core concrete than ordinary strength steel tube due to its high yield strength.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Study of the Behavior of Concrete-Filled High-Strength Steel Tube Columns with Large D/t Ratio under Axial Compression

et al. 2022

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The thin-wall high-strength (HS) steel tube can provide strong confinement ability for core concrete due to its high yield strength, so it can achieve the purpose of confining concrete lateral deformation. In order to make full use of the mechanical properties of HS steel tube and concrete, it is necessary to study the axial compressive properties of the concrete-filled HS steel tube (CFHST) with a large diameter-to-thickness ratio (D/t). In this study, the axial compressive capacity of 15 CFHST columns with a large diameter-to-thickness ratio was tested. Then, a series of finite element (FE) models were developed to study the interaction mechanism between steel tube and concrete, the load–strain curves of typical specimens, and the effect of the key parameters. Finally, a new design proposal for CFHST compressive capacity is proposed and compared with EC4, GB50936-2014, and AIJ-97 prediction results. The results showed that the CFHST has good compressive capacity and can effectively confine the lateral deformation of core concrete; the contact pressure appears a stable stage because with a steel tube is difficult to effectively restrain the lateral deformation after steel tube yielding and partial failure of concrete; the existing design code is conservative in predicting the axial compression capacity of the CFHST with large D/t ratio.

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Section: Effect Of Confinement Effect Coefficientmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of the Behavior of Concrete-Filled High-Strength Steel Tube Columns with Large D/t Ratio under Axial Compression

et al. 2022

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“…The above studies have not considered the impact of the corrosion environment on the impact performance of steel members, and it is unavoidable for steel members to encounter impact-corrosion conditions in practical engineering applications. Literature (Yulin et al, 2022) investigated the transverse impact response of concrete-filled steel tubular columns with localized corrosion and obtained the corresponding bearing capacity formulas by considering the influence of the impact surface, the length and angle of the cracks, etc., but did not consider the influence of steel fracture. However, the local defect region of the steel member is prone to fracture failure under impact loading, which is unfavorable for the impact resistance of the member.…”

Section: Introductionmentioning

confidence: 99%

Lateral impact response of circular hollow steel tubes with mid-span localized penetrating notches

Huang,

Wang

2023

Front. Mater.

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In this study, 32 numerical models of CHST columns were established in the ABAQUS program to evaluate the effect of mid-span local defects on the impact resistance of circular hollow steel tube (CHST) columns. The simulation studies were conducted from three aspects: notch length, notch angle, and impact energy. The results showed that under a lateral impact load, the mid-span of the CHST column presented global bending failure patterns accompanied by local indentation deformation in the impact region and local buckling deformation at the bottom of the fixed end. Compared with the mid-span indentation displacement of the non-notch model, when the impact velocities were 30 km/h and 60 km/h, the horizontal notch model surpassed the maximum by 29.3% and 36.3%, the oblique notch model surpassed the maximum by 47.8% and 115.6%, and the vertical notch model only increased by 9.7% and 1.1%. The local damage area and impact force time-history curves of the vertical notch model agreed well with those of the non-notch model. Among the three notch angles, the impact plateau values of the vertical notch model and the global bending displacement in the mid-span were least affected by the notch length, notch location, and impact energy. The energy absorption of the CHST column was mainly due to indentation deformation in the mid-span, and the global bending deformation was auxiliary. Compared with the energy absorption ratio (EAR) of the non-notch model, with increased impact energy, the EAR of the vertical notch model increased by 20.2%, 13.5%, and 17.3% on average. The horizontal and oblique notch models decreased by 28.2%, 61.0%, 42.4%, and 29.1%, 62.7%, and 49.3%, respectively. The Rd of all notch models showed an overall upward trend as the impact energy increased, and the Rd of the horizontal notch model increased the most. According to the parametric analysis results, the dynamic flexural capacity prediction formula of the CHST columns section was obtained, considering the influence of notch length, notch angle, and impact energy within the parameter range of this study.

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Design Calculation for Concrete-Filled Steel Tube under Soft Lateral Impact

2022

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In recent decades, the rapid development of transportation construction has increased the possibility of concrete-filled steel tubes (CFSTs) subjected to soft lateral impact. Some kinds of deviation may still exist between the soft impact process and its design prediction due to frequent safety accidents. To improve the prediction accuracy, this paper contrasted the current soft impact design with the experimental impact processes of CFSTs. The current design is represented by the method and route in Eurocode-1 Actions on structures, which belongs to the one-step type. Extra parameters were added to the one-step method to describe the inertia effect of CFST. According to the experiments and predictions, the soft impact process contains two stages, which are the initial peak stage (IPS) and the stable stage (SS). The current one-step method is consistent with SS but incorrect in IPS and its accuracy is related to the proportion of IPS and SS. An empirical formula, based on the weight of IPS, is summarized to evaluate the overall error of the one-step method in the soft impact design of CFST. This error is due to the unreasonable assumption of the inertial effect in IPS. For the demands of an accurate design in IPS, a new technical route is proposed, consisting of two steps: qualitative analysis and two-stage calculation. The qualitative analysis achieved an approximate quantitative division of IPS and SS, and provided the design loads for the two-stage calculation. The two-stage calculation supplemented the prediction of the inertia effect in IPS and independently estimated the resistances and responses of CFST in the two stages. The above qualitative analysis and two-stage calculation constituted the two-step method and its accuracy and applicability are generally better than that of the one-step design.

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Lateral Impact Response of Concrete-Filled Square Steel Tubes with Local Defects

Cited by 3 publications

References 10 publications

Experimental and Numerical Study of the Behavior of Concrete-Filled High-Strength Steel Tube Columns with Large D/t Ratio under Axial Compression

Experimental and Numerical Study of the Behavior of Concrete-Filled High-Strength Steel Tube Columns with Large D/t Ratio under Axial Compression

Lateral impact response of circular hollow steel tubes with mid-span localized penetrating notches

Design Calculation for Concrete-Filled Steel Tube under Soft Lateral Impact

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