3-D Modeling of Pyramid Cover Systems to Retrofit Hexagonal Core Sandwich Structures | ||||
| The International Conference on Civil and Architecture Engineering | ||||
| Article 31, Volume 9, 9th International Conference on Civil and Architecture Engineering, May 2012, Page 1-15 PDF (1.04 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/iccae.2012.44270 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| A. A. Mostafa1; A. H. Salem2; M. A. Wahab3; S. A. Mazek4 | ||||
| 1Ph. D. Egyptian Engineering Military Department. | ||||
| 2Professor, Structural Engineering Department, Faculty of Engineering, Ain Shams University, Cairo. | ||||
| 3President of Technical Research Department, Cairo, Egypt. | ||||
| 4Associate Professor, Civil Engineering Department, Military Technical College, Cairo, Egypt. | ||||
| Abstract | ||||
| Abstract Fortified structures are considered very important structures in military enginee ring fields due to a continuous development of conventional weapon. The f ortified structures are constructed above or underground. Blast wave causes structure damages based on explosive weight and distance between charge and target. Armoured doors are used in fortified structures in order to protect people, weapons, and ammunition from blast waves. Sandwich armoured steel door may be damaged as it is hit by blast waves. In the present study, the prediction of the sandwich armoure d steel doors performance under the impact of blast wave effect is highlighted. A 3-D numerical model is proposed to study pyramid cover system (PCS) layer to retrofit sandwich armoured steel doors using a 3-D nonlinear finite element analysis (FEA). Hexagonal core sandwich (XCS) doors are used so as to study blast mitigation using the PCS layer. Blast field test is implemented to understand performance of armoured XCS doors with and without the PCS. The study presents a comparison between the field blast test and the finite element analysis results to assess the accuracy of the proposed 3-D finite element model (FEM). The constitutive model for this analy sis contains elasto-plastic materials. An elasto-plastic model is employed to represent the armoured doors, the concrete wall of the fortified structure, and the PCS layer. The proposed model is programmed and linked to an available computer program Auto dyn3D (2005). The 3-D nonlinear FEM takes into account the effects of the blast load, the connection between the armoured doors and the frame fixed to the concrete wall, and the PCS layer. The effects are expressed in terms of displacement -time history of the sandwich armoured doors and pressure-time history on armoured XCS doors as the explosive wave propagates. The behavior of the sandwich armoured XCS doors sheltered by the PCS is investigated and presented under blast waves obt ained from detonating 1-kg, 2- kg, and 3-kg TNT explosive charge at a scaled distance of 1 m. | ||||
| Keywords | ||||
| Displacements; Finite Element Analysis; blast wave; sandwich structures; armoured doors | ||||
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