Weak axis response of steel I-sections subjected to close-in detonations

Grisaro, Hezi Y.; Packer, Jeffrey A.; Seica, Michael V.

doi:10.1016/j.jcsr.2019.05.025

Cited by 11 publications

(22 citation statements)

References 22 publications

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“…As a natural extension of the previous study (Grisaro et al, 2019), this article presents a study of the response of I-shape sections subjected to close-in detonation, loaded to result in flexure about the strong axis. A simulation method for close-in detonation, which was implemented for the weak-axis response of I-section members (Grisaro et al, 2019), was used to overcome the expensive modelling issues.…”

Section: Figurementioning

confidence: 94%

“…Folding of flanges of I-section subjected to blast load acting on its (a) weak axis (Grisaro et al, 2019); and (b) strong axis (current study).…”

Section: Figurementioning

confidence: 95%

“…Figure 1 shows a typical cross-section deformation of an I-section member subjected to closein detonation. Deformation due to blast acting on the weak axis of the section was presented by Grisaro et al (2019), while the response due to blast pressure acting to generate flexure about the strong axis of the section is discussed in the present study. For the weak-axis response, three main parameters are defined in Figure 1a: (i) the global deflection of the web, (ii) the total deflection of the web (which equals the sum of the global and local deformations of the web), and (iii) the angle of rotation (folding angle) of the section flanges.…”

Section: I-sections Under Blast Loadingmentioning

confidence: 96%

“…The first approach is the most commonly used of these. However, while the reliability of empirical methods is relatively high for far-field blast loading, for close-in detonations it is very limited (Grisaro et al, 2019). Thus, approaches (ii) and (iii) should be used for close-in detonation events.…”

Section: Generalmentioning

confidence: 99%

“…Based on previous publically available research, the response of I-shape sections to close-in detonations is not completely understood. In a previous study, the response of an I-section loaded about its weak axis by pressures from close-in detonation was simulated (Grisaro et al, 2019). A method of strengthening the section with stiffener plates welded to the section was investigated, to study and quantify the potential benefit achieved by preventing local damage and improving global structural response.…”

Section: Figurementioning

confidence: 99%

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Strong-axis response of steel I-sections subjected to close-in detonations

Grisaro

Seica

Packer

et al. 2020

International Journal of Protective Structures

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The analysis of structural members subjected to close-in detonations involves a complicated dynamic scenario. Since the charge is very close to the structural member, the reflected pressure distribution on the member surface is highly non-uniform. In addition, the level of damage to the structural member may be high because of the large magnitude of the load. Due to these phenomena, the response of a structural member to close-in detonation cannot be accurately modelled by relatively simple methods like single-degree of freedom models, and more complicated models are required. Such models need to include numerical simulation of the detonation process, which produces a non-uniform pressure environment, allowing the pressure to reflect and flow around the member section. The local damage and flow around the section are especially of interest in I-shaped, or wide-flange-section members. Herein, the response of such sections is modelled by numerical simulations using a novel technique, which overcomes the difficulty of computation time, and is validated through various calculations. The model is used to perform a parametric study to investigate the response of I-sections subjected to close-in detonations, in terms of local damage and global behaviour, with scaled distances of 0.15–0.29 m/kg1/3 and loading causing flexure about the strong axis. Various aspects that affect the performance are studied, such as: the effect of scaled distance, the addition of welded stiffening plates between the flanges and web, the effect of boundary conditions and the effect of charge shape. Resulting local damage and residual deformations are assessed for the cases studied.

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Section: Figurementioning

confidence: 94%

“…Folding of flanges of I-section subjected to blast load acting on its (a) weak axis (Grisaro et al, 2019); and (b) strong axis (current study).…”

Section: Figurementioning

confidence: 95%

Section: I-sections Under Blast Loadingmentioning

confidence: 96%

Section: Generalmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%