Numerical Simulations of Stiffened Multi-Arch Double-Layered Panels Subjected to Blast Loading

Abstract

Blast-resistant structures are traditionally designed and fabricated with solid materials of heavy weight to resist blast loadings. This not only increases the material and construction costs, but also undermines the operational performance of protective structures. To overcome these problems, new designs with either new structural forms or new materials are demanded against blast loads. A multi-arch double-layered panel has been proposed as a new structural form in a previous study [1]. Its performance has been numerically demonstrated better than other forms of double-layered panels in resisting blast loads. In this study, to further improve the effectiveness of the multi-arch double-layered panel in resisting blast loads, responses of a five-arch double-layered panel with rectangular stiffeners to detonations are investigated by using finite element code Ls-Dyna. The numerical results show that the stiffened panel outperforms the unstiffened panel of the same weight in terms of the blast-resistant capacity and energy absorption capacity. Parametric studies are conducted to investigate the effects of various stiffener configurations, boundary conditions, stiffener dimension, strain rate sensitivity and blast intensity on the dynamic response to blast loadings. The central point displacements, internal energy absorptions, boundary reaction forces and plastic strains are compared and the optimal configurations of blast-resistant panel are determined. It demonstrates that the strategic arrangement of stiffeners with appropriate boundary conditions can maximize the reduction of dynamic response of the panels to blast loadings. The stiffened multi-arch dotuble-layered panels have great application potentials in the blast-resistant panel design.

Development and performance evaluation of large-scale auxetic protective systems for localised impulsive loads

“…Development of lightweight protective systems for the protection of critical infrastructures, such as government assets, airports, transport terminals, military buildings and vehicles, from blast and impact loads have been gaining more attention of field experts due to the increasing trend of terrorist attacks and accidental explosions (Chen and Hao, 2013; Codina et al, 2017; Qi et al, 2017; Smith, 2010). When the civil infrastructures are subjected to blast and impact loads, the structural elements, such as columns, beams and slabs, could be critically damaged and cause a loss of structural stability.…”

Stress Wave Mitigation Properties of Dual-meta Panels against Blast Loads

“…The keyword *LOAD_BLAST_ENHANCED is widely utilized in LS-DYNA to generate blast load [3,4] via the CONWEP feature, which takes into consideration the reflection of the blast wave from the surface of the panels. In this study, the blast load on the front plate of the dualmeta panel which considers the enhancement of the reflected waves is defined by this function.…”

“…Whereas solid monolithic structures [1] and porous materials [2] are currently popular candidates for protective structures, the underlying drivers to refrain from using these types of structures are that they are likely to be cumbersome and bulky. It is, therefore, essential to promote and apply sandwich panels for blast-resistants [3,4]. The use of sandwich panels attached to main structures as sacrificial cladding were investigated by many researchers, e.g., Hanssen et al [5].…”

Numerical Investigation on Blast Response of Cold-Formed Steel Framing Protected with Functionally Graded Composite Material

“…A non-linear analysis of FGM sandwich plates and shell, as well as FGM large deformation analysis, is presented in [11][12][13][14]. Similar articles on FGM and resistance of steel wall systems can also be found in several studies [15][16][17][18][19][20][21][22].…”