Experimental and numerical investigation of steel-concrete (SC) slabs under contact blast loading

Zhao, Chunfeng; Lu, Xin; Wang, Qiang; Gautam, Avinash; Wang, Jingfeng; Mo, Y. L.

doi:10.1016/j.engstruct.2019.109337

Cited by 66 publications

(66 citation statements)

References 33 publications

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“…The explicit nonlinear finite element program LS-DYNA was used to simulate the deformation and damage of the RC walls under blast loading [ 12 , 20 ]. As shown in Figure 8 a, the finite element model comprised four parts, namely, the air domain, explosive, RC wall (steel bar and concrete), and foamed concrete.…”

Section: Methodsmentioning

confidence: 99%

“…As shown in Figure 8 a, the finite element model comprised four parts, namely, the air domain, explosive, RC wall (steel bar and concrete), and foamed concrete. Given the face symmetry of the structure, to reduce the amount of calculation, the model was simplified by establishing a one-half model with symmetrical constraints [ 20 ]. The underground part was omitted from this model.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, the RC wall model had an overall size of 750 mm × 1200 mm × 120 mm. The beam element was selected for the steel bar, and the solid element was selected for the other parts [ 20 ]. The air and explosive adopted the Euler grid, whereas the concrete and foamed concrete adopted the Lagrange grid.…”

Section: Methodsmentioning

confidence: 99%

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Influence Mechanism of Foamed Concrete Coating Thickness on the Blast Resistance of RC Walls

Shang

Huang

et al. 2022

Materials

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How to effectively reduce the damage of frequent accidental explosions and explosion attacks to existing walls is an important concern of the blast resistance field. In the present study, the influence of the foamed concrete (density 820 kg/m3, water-cement ratio 0.4) coating thickness on the blast resistance of a 120 mm RC (reinforced concrete) wall was studied through blast experiments, numerical simulations, and shock wave theory. Results show that the influences of foamed concrete on the blast resistance of RC walls are jointly decided by the stress drop caused by impedance effect and exponential attenuation and the stress rise caused by high-speed impact compression. The coating thickness mainly affects the foam concrete’s fragmentation degree and stress attenuation. A lower critical coating thickness exists in foamed concrete-coated RC walls. The blast resistance of the RC wall will decrease when the coating thickness is less than that value. The lower critical coating thickness is related to the intensity of blast load and the energy absorption capacity of foamed concrete, and it can be predicted by monitoring the explosive stress and energy incident to the RC wall.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Influence Mechanism of Foamed Concrete Coating Thickness on the Blast Resistance of RC Walls

Shang

Huang

et al. 2022

Materials

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“…These tests are performed in controlled conditions on targets having limited size and simple geometry. For instance, in (Anderson et al, 2011), flat and V-shaped steel plates have been tested against the detonation of cylindrical charges; in (Wang et al, 2017), a cylindrical charge of RDX is suspended above a sandwich panel with honeycomb core to test its response to the blast; circular plates are tested in (Chen et al, 2016) and steel-concrete slabs in (Zhao et al, 2019). These plates and panels are used as components to build blast resistant vehicles and structures (for instance, doors).…”

Section: Introductionmentioning

confidence: 99%

Shock qualification of low-cost blast resistant wheels by in field tests

Silvestri

Adele

Elisa

et al. 2022

International Journal of Protective Structures

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This paper presents the results obtained during an experimental campaign on blast resistant wheels designed for a low-cost demining machine, derived from an agricultural tractor. Such wheels must fulfil two requirements: first, they have to be able to retain their mechanical integrity in case of blast and still work after one or more explosions, in order to be able to drive the machine out of the minefield without human intervention; second, they must reduce as much as possible the amount of energy transferred to the vehicle, to protect the on-board equipment from the effect of the detonation of a landmine. One of the goals of the experimental activity was to compare two wheels characterized by different designs. Mechanical performance and capacity of the wheels to reduce the energy transferred to the vehicle have been assessed to verify whether the wheels were suitable for the task and to identify which wheel performs best. Physical integrity of both wheels was assessed by visual inspection after each explosion. To evaluate the energy transferred to the vehicle, a measurement of the potential energy transferred, by means of a ballistic pendulum, equipped with an encoder, was performed together with a triaxial acceleration measurement in correspondence of the wheel hub. The triaxial accelerometer measurement was then also used to assess the behaviour of the wheels mounted on the vehicle after tests on the ballistic pendulum. Wheel performances have been quantified using specific features and frequency domain functions, related to the damage induced by the vibration at the interface between the hub and the demining machine. The obtained results suggest that the heaviest wheel performs better both in terms of mechanical integrity and of shock response.

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“…Li and Hao 33 studied spall damage of RC columns subjected to blast loads. Using the ConWep air blast function, Zhao et al 34,35 made a numerical investigation on the dynamic behaviours of concrete slabs under close-in blast load. Kong et al 36 studied effect of AFRP on the blast resistance of RC slab.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Dynamic Response of RC Slabs Subjected to Cyclic Blast Loading

Wang

Dong

Gao³

et al. 2022

Preprint

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Finite element (FE) model which can be used to investigate accumulated damage of the reinforced concrete (RC) slabs under cyclic blast loading is proposed. Firstly, accuracy of the FE model is verified through an experiment. Secondly, effects of the explosive inclination angle, standoff distance, and the explosive mass on the dynamic response of RC slabs are studied. At last, accumulated damage of the reinforced concrete (RC) slabs under cyclic blast loading is presented using the FE model. It is indicated that parameters of the explosive inclination angle, the scale distance, and the explosive mass have strong influences on the dynamic behavior of RC slabs. Under cyclic blast loading with small explosive charge, damage of the RC slab mainly appears in the first blast cycle. Displacement of the RC slab, axial force and strain of the rebars increase remarkably, which could be the mainly reason that damage evolution of the RC slab is not obvious, in the second blast cycle.

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Experimental and numerical investigation of steel-concrete (SC) slabs under contact blast loading

Cited by 66 publications

References 33 publications

Influence Mechanism of Foamed Concrete Coating Thickness on the Blast Resistance of RC Walls

Influence Mechanism of Foamed Concrete Coating Thickness on the Blast Resistance of RC Walls

Shock qualification of low-cost blast resistant wheels by in field tests

Numerical Study on Dynamic Response of RC Slabs Subjected to Cyclic Blast Loading

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