Experimental and numerical studies of tubular concrete structures subjected to blast loading

Kristoffersen, Martin; Hauge, Knut Ove; Minoretti, Arianna

doi:10.1016/j.engstruct.2020.111543

Cited by 17 publications

(11 citation statements)

References 63 publications

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“…The shear modulus G, the pressure hardening constants B and N, the damage constants α and β, and the minimum strain to failure εfp,min were all obtained by inverse modelling of the cylinder compression tests and are given in Table 2. This approach has been successful in previous work [16]. The resulting engineering stress-strain curves match the experiments well and are plotted as dashed lines in Fig.…”

Section: Numerical Simulations 41 Constitutive Relation and Calibrationsupporting

confidence: 62%

Ballistic impact on concrete slabs: An experimental and numerical study

Kristoffersen

Toreskås²,

Dey³

2021

EPJ Web Conf.

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The ballistic perforation resistance of 50 mm thick concrete slabs impacted by 20 mm diameter ogive-nose steel projectiles is investigated experimentally and numerically. Three commercially produced concretes with nominal unconfined compressive strengths of 35, 75 and 110 MPa were used to cast material test specimens and slabs. After curing, ballistic impact tests were carried out to determine the ballistic limit curve and velocity for each slab quality. Material tests instrumented with digital image correlation (DIC) were conducted along the ballistic impact tests. DIC measurements were used to establish engineering stress-strain curves for calibration of a modified version of the Holmquist-Johnson-Cook concrete model. Finite element simulations of the impact tests gave good conservative predictions.

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Section: Numerical Simulations 41 Constitutive Relation and Calibrationsupporting

confidence: 62%

Ballistic impact on concrete slabs: An experimental and numerical study

Kristoffersen

Toreskås²,

Dey³

2021

EPJ Web Conf.

Self Cite

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“…Detonation time of charges is judged by video, the gauge at Point 3 of Test 3 was damaged during the magnetic hoisting of the cylindrical shell, so this data was rejected. Since the fireball did not directly touch the gauges, the negative pressure of the gauges quickly returns to atmospheric pressure after blasts (Kristoffersen et al, 2021). Blast loads on the side face of the cylindrical shell fluctuate greatly, and the decay section of the overpressure-time history has many small protrusions.…”

Section: Experimental Studiesmentioning

confidence: 99%

“…For bomb attacks in urban environments, blast loads on structures depend on the geometric shape of structures and blast waves. Previous studies on blast loads mostly focus on spherical charges and flat targets, some design manuals give blast loads on the surface of cuboids (Baker, 1973; Defense, 2008; Henrych and Abrahamson, 1980; Hyde, 1991; Kingery and Bulmash, 1984), a probabilistic blast load model for domes has been proposed based on extensive tests (Qi et al, 2020; Zhi et al, 2019), detailed experimental data on blast loads of cylindrical structures for direct verification of numerical models are not available (Hahn et al, 2020; Kristoffersen et al, 2021; Qasrawi et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Experimental and simulation study on blast loads of cylindrical Shells

Wei

Zheng

Yang

et al. 2022

Advances in Structural Engineering

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Public buildings that house large populations are easy targets for terrorist attacks, the primary issue of architectural blast-resistant design is how to get blast loads on the surface of structures, and the shapes of blast waves and buildings both have important effects on it. In this paper, experiments and numerical simulations were carried out on blast loads on the surface of the cylindrical shell. blast loads, detonation products, and blast waves were well recorded and simulated, blast loads at the edge of cylindrical shells were attenuated by about 75%, and vortex rings were accidentally photographed nearby. blast loads are much affected by the location of the detonation point, charge shape, and charge size. The original shape of structures rather than deformation determines the distribution of blast loads, the air viscosity also needs to be scaled when using a scaled model to test blast loads. Experimental and simulation methods can offer a reference for building a standard database of blast loads.

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“…Further, a semi-confined environment may even amplify the damages caused by the negative phase [11]. Confinement effects account for the fact that much smaller contact charges are needed to breach a tubular concrete structure from the inside than from the outside [12]. Explosions inside tunnel-like geometries may even cause strong and long-lasting pressure oscillations [13].…”

Section: Introductionmentioning

confidence: 99%

Semi-confined blast loading: experiments and simulations of internal detonations

Kristoffersen,

Casadei,

Valsamos

et al. 2024

Shock Waves

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Far-field blast loading has been studied extensively for decades. Close-in, confined, and semi-confined detonations less so, partly because it is difficult to obtain good experimental data. The increase in computational power in recent years has made it possible to conduct studies of this kind numerically, but the results of such simulations ultimately depend on experimental validation and verification. This work thus aims at using reliable experiments to validate and verify numerical models developed to represent blast loading in general. Test rigs consisting of massive steel cylinders with pressure sensors were used to measure the pressure profiles of semi-confined detonations with different charge sizes. The experimental data set was then used to assess numerical models appropriate for simulating blast loading. In general, the numerical results were in excellent agreement with the experimental data, in both qualitative and quantitative terms. These results may in turn be used to analyse structures exposed to internal blast loads, which constitutes the next phase of this research project.

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Experimental and numerical studies of tubular concrete structures subjected to blast loading

Cited by 17 publications

References 63 publications

Ballistic impact on concrete slabs: An experimental and numerical study

Ballistic impact on concrete slabs: An experimental and numerical study

Experimental and simulation study on blast loads of cylindrical Shells

Semi-confined blast loading: experiments and simulations of internal detonations

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