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Analysis & Calculations for Blast Door(방폭문 구조 검증)
Reference for Blast Resistant Door Structural Analysis & Calculation Design (방폭문 구조검증 참고 사항)
Standard(기준): Ministry of Defense Explosives Regulations,” JSP 482, Edition 4, Jan 2013
Blast Load(방폭 압력) : Peak pressure of 573 kPa, Impulse of 14,700 kPa-ms is attained for externally of the door structure in accordance with JSP 482 Regulation 2
Analysis Software(사용프로그램): LS-DYNA [5]
Auto/Manual Sliding Door Type
① CAD Model & Geometry
  • General Overview of the System
  • Steel Door Frame and Construction with U-beams, and I-beams
  • Overall FEM – Outside View – Walls are Hidden
② Material Properties
Steel Grade Yield Strength
[Mpa]
Tensile Strength
[Mpa]
Elongation at Break
[%]
S275 275 560 22
S355 355 630 22
4140 867 1150 17.5

The Mechanical Properties of the Materials

Piecewise Linear, Non-linear Plasticity Model for the Materials.

③ Blast Loading

Impulse Loading on the Structure wrt JSP 482 Regulation

Stress Levels of the Door after Internal Blast

④ Result

Blast from Inside the Cell

Maximum Displacement of the Door after Internal Blast

⑤ Conclusions

Based on the FEA calculation results (Stress, Displacement, etc.) overall sliding door structure is investigated with the given design and material information for two blast loading scenarios in accordance with JSP 482 Regulation4, one from outside the cell and one is inside the cell. Some risk is observed especially at the welding connections and localized stress points. However, for the material system, the threshold for stress and plastic strain is not exceeded. Measured maximum displacement values also lead to a conclusion that the door system is likely to be operable after blast loading. Under the highlight of the technical analysis the details of which are explained; it is found that the design under consideration can successfully withstand the given impulse and fulfills all requirements designated in the Ministry of Defense Explosives Regulations, JSP 482, Edition 4, January, 2013.

Manual Double Swing Door Type
① CAD Model & Geometry
  • General Overview of the System
  • Steel Door Frame and Construction with latches
② Material Properties
Steel Grade Yield Strength
[Mpa]
Tensile Strength
[Mpa]
Elongation at Break
[%]
S275 275 560 22
S355 355 630 22
4140 867 1150 17.5

The Mechanical Properties of the Materials

Piecewise Linear, Non-linear Plasticity Model for the Materials

③ Blast Loading

Impulse Loading on the Structure

Stress Levels and Scaled Deformation within the Structure after External Blast

④ Result

Blast from Outside the Cell

Equivalent Stress Levels within the Boundary Conditions and Anchorages after External Blast

⑤ Conclusions

Based on the FEA calculation results (Stress, Displacement, etc.) overall swing door structure is investigated with the given design and material information for external blast loading scenario. Some risk is observed especially at the latches connecting the steel door plates and the frame. However, for the material system, the threshold for stress and plastic strain is not exceeded. Measured maximum displacement values also lead to a conclusion that the door system is likely to be operable after blast loading. Under the highlight of the technical analysis the details of which are explained; it is found that the design under consideration can successfully withstand the given impulse and fulfills all requirements designated in the Ministry of Defense Explosives Regulations, JSP 482, Edition 4, January, 2013.