Experimental study of large-sized concrete filled steel tube columns under blast load

Wang, Hongwei; Wu, Chengqing; Zhang, Fangrui; Fang, Qin; Xiang, Hengbo; Li, Peng; Li, Zhibin; Zhou, Yun; Zhang, Yadong; Li, Jun

doi:10.1016/j.conbuildmat.2016.12.096

Cited by 57 publications

(17 citation statements)

References 20 publications

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“…The results also indicated that the confinement of the CFRP reduced the global displacement of both the RACFST and NACFST specimens. Wang et al [34] investigated blast resistance and the residual strength of CFST columns with the damage of close-range blast loads. The results indicated that CFST columns still had a large portion of axial load capacity even after close-range blast events.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Behavior of Circular CFST Columns Subjected to Different Lateral Impact Energy

et al. 2019

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“…Mana [17] studied the effects of an explosion on a building with and without a soil barrier. Moreover, researchers successfully reduced the effect of blast loading on building foundations by utilizing advanced material casts along with ultra-high performance concrete materials [18,19]. A study of the protection of containers was conducted by Elshafey, M.M et al [20,21], introducing a suppressive shield container to transport hazardous materials safely on Canadian roads.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis for Critical Structures Protection against Blast Loading Using Metallic Panels

Alogla

Helal

Elshafey³

et al. 2020

Applied Sciences

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The need for building protection against blast loads is a crucial issue nowadays due to the escalating threat of terrorist attacks, which affect people’s lives and critical structures. Consequently, design of protective panels to segregate building façades from the effect of a nearby explosion is required. Such design mainly depends on the ability of protective panels to mitigate and diffract the blast wave before reaching building façades. Five protective panel models with different designs, referred to as the Combined Protection System (CPS), are introduced in this paper. The main objective of this research was to achieve a design that could sustain a blast load with minimum plastic deformations. The introduced CPS designs included two steel plates linked by connector plates. The CPS dimensions were 3 m × 3 m × 0.35 m, representing length, width, and height, respectively. After that, the successful panel design was supported by placing these panels onto a masonry wall in different configurations. The protective panels were tested against 50 kg of trinitrotoluene (TNT) with a standoff distance of one meter. The final run of the optimum model was carried out using a blast load equivalent to 500 kg of TNT. The air–structure interactions were simulated using finite element analysis software called “ANSYS AUTODYN”, where the deformation of the panel was the governing parameter to evaluate the behavior of different designs. The analysis showed minimum deformation of the CPS design with vertical and horizontal connecting plates in a masonry wall distanced at 500 mm from the panel. However, the other designs showed promising results, which could make them suitable for critical structural protection on different scales.

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“…It is verified that CFST specimens have high impact resistance under explosive loads. And there are also researches on lateral impact of CFST columns (Deng et al, 2012; Han et al, 2014; Wang et al, 2017; Yang et al, 2015). All the above results show that the impact resistance of CFST columns is obviously higher than that of ordinary concrete.…”

Section: Introductionmentioning

confidence: 99%

Stress monitoring and impact bearing capacity of circular concrete-filled steel tubular short columns under axial impact loads

Gao

et al. 2019

Advances in Structural Engineering

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Compared with the traditional reinforced concrete columns, the concrete-filled steel tubular columns with a better restraint effect of steel tube on core concrete showed higher bearing capacity and ductility under static loads. However, except static loads, concrete-filled steel tubular columns are commonly exposed to the extreme dynamic loads including earthquake, explosion, and impact. The study on dynamic behavior of concrete-filled steel tubular columns is extremely significant to ensure their safety against such dynamic loads. In this article, a polyvinylidene fluoride piezoelectric smart sensor was proposed to monitor the axial impact bearing capacity of specimen based on stress monitoring under impact loads. The concrete-filled steel tubular columns with smart sensor embedded were tested, which considered the effects of both hammer impact heights and steel tube thickness on the axial impact bearing capacity. The impact bearing capacity calculated based on the monitoring results of polyvinylidene fluoride sensor is in good agreement with the measured values, which verifies the feasibility of this method. Moreover, it is found that the failure mode of concrete-filled steel tubular short columns is the local tearing failure or local buckling. In addition, non-linear finite element models were also established to study the effect of different parameters on the axial bearing capacity. The simplified formula for calculating the axial impact bearing capacity of concrete-filled steel tubular short columns was proposed based on the large amount verified model. Through the comparison between the calculation value and the test value, the formula is found to well reflect the axial impact bearing capacity of concrete-filled steel tubular short columns, which provides a reference for similar research.

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Experimental study of large-sized concrete filled steel tube columns under blast load

Cited by 57 publications

References 20 publications

Behavior of Circular CFST Columns Subjected to Different Lateral Impact Energy

Behavior of Circular CFST Columns Subjected to Different Lateral Impact Energy

Numerical Analysis for Critical Structures Protection against Blast Loading Using Metallic Panels

Stress monitoring and impact bearing capacity of circular concrete-filled steel tubular short columns under axial impact loads

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