2021

chapter in monograph

english

EN Blast-resistant gates are necessary for critical infrastructure, such as embassies, ministries, or parliaments. Lightweight doors/gates equipped with “energy absorbers” have more desirable operational performance than the traditional costly and bulky options. Auxetic damping systems have not yet been used in the supporting structure of blast-resistant gates. Consequently, this essay tries to propose a complete system consisting of a steel gate, auxetic dampers, and RC supporting structure. The system is supposed to withstand high-intensity blast pressure of 6.6 MPa. Blast behavior of a steel gate was assessed, with and without the proposed uniaxial graded auxetic damper (UGAD), using Abaqus/Explicit solver. Results revealed that the attachment of the proposed UGAD to the gate led to a dramatic drop in permanent deformations (a critical factor for gate operability after a blast event). Hence, a lighter, more economical gate (with 50% reduction of mass) was required to satisfy the operability condition. Moreover, 49% of peak reaction forces were diminished that had a direct impact on the concrete supporting frame. Additional plastic dissipation energy was gained from those sacrificial lightweight auxetics, which justifies the significant reduction in permanent deformations, mass of the gate, and reaction forces. Finally, the impact of the blast pressure and the auxetic dampers on the reinforced concrete supporting structure was thoroughly covered using CDP and J-C material models. Results of the designed structure showed that the reinforcement stays in the elastic range. In terms of the concrete, no damage in compression was observed with very limited tension cracks that can be neglected. The complete gate system proposed here can be considered as a novel robust solution for blast vulnerable structures.

23.01.2021

71-1 - 71-23

10.1007/978-1-4614-8968-9_71-1

https://link.springer.com/referenceworkentry/10.1007/978-1-4614-8968-9_71-1

Handbook of Damage Mechanics : Nano to Macro Scale for Materials and Structures

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