Design and Simulation of Reinforcement Wall with Concrete Shield Against Blasting Loads in the Explosives Storage

Document Type : Technical Note

Authors

1 Dept. of Civil Engineering, Shahrood branch, Islamic Azad University, Shahrood, Iran

2 Dept. of Mine Engineering, Shahrood branch, Islamic Azad University, Shahrood, Iran

10.29252/anm.2019.7855.1270

Abstract

Summary
Terrorist attacks could cause serious destruction and death by damaging to buildings and infrastructures. One of the most vulnerable mine structures are storages containing explosives, detonator caps and Detonation fuse. In this study a 6.5 x 2.5 storage of electrical caps is designed by ETABS firstly. Then its wall is modeled in finite element commercial software ABAQUS in order to investigate its behavior and resistance under blast loads. The U-shaped shear wall type with dimensions of 3x3 meter is chosen for this wall, and the wall is considered in 4 conditions: with 8, 10 and 15 cm protective shield and without protective shield. Blast loads are positioned in 10, 50 and 100cm distance of center of the shield. The results show that in the existence of the shear wall, displacements of the shear wall, shear stress of the wall and stress at the base of the column decreases up to 97.4%, 56.4% and 36.7% respectively. It’s concluded that reinforcement of shear walls with protective shields provides sturdy structures in order to store explosives and detonator caps in mines.
 
Introduction
If an explosion takes place outside of these detonator caps and detonation fuses, the of the blast wave effect could cause a blast at explosives inside the storage and lead to a great damage. Hence, it’s important to study these effects on this kind of structures. In this study, a 3.5x6.5 storage of electrical cap, whose walls are designed as U-type shear walls protected by concrete shield. In order to investigation behavior of the wall and the effectiveness of the shield against blast loads, a wall with dimensions of 3x3 is modeled in ABAQUS under 4 distinct conditions: with various 8, 10 and 15 cm shield and without shield.
 
Methodology and Approaches
To design the walls, the software ETABS is used, and finite element commercial software ABAQUS, which has great ability to solve explicit dynamic problems, is employed to simulate the behavior of walls and shields under blast loads.
 
Results and Conclusions
By protecting the wall against blast loads, Concrete shield was able to reduce the displacement of the wall, stress of the wall and stress at the base of the column up to 97.4%, 56.4 and 36.7 respectively. Besides, it keeps explosives and detonator caps inside the storage safe by degrading the energy of the outside blast wave.

Keywords

Main Subjects

Full Text

بتن ماده­ای است که در صنعت ساخت و ساز به وفور از آن استفاده می‌شود و می‌توان این ماده را در ساخت سازه‌های شهری و نظامی به کار برد. حملات تروریستی در سالیان اخیر خسارات جانی و مالی زیادی را به بار آورده است. برخی ساختمان­ها مانند فضاهای درمانی، بهداشتی، خدماتی، صنعتی و ... به دلیل نقش مهمی که در شرایط بحرانی دارند، از ارزش دوچندانی برخوردار هستند. یکی از مهم‌ترین سازه­ها که در صورت مواجه با این نوع حملات بسیار آسیب‌پذیر است، انبارهای نگهداری چاشنی­ها و مواد آتشباری معادن است. در کشور حدوداً 960 انبار نگهداری مواد منفجره مربوط به معادن و 1070 انبار نگهداری مواد منفجره برای پروژه‌های عمرانی از قبیل پروژه‌های سدسازی وزارت نیرو، پروژه‌های لرزه‌نگاری وزارت نفت و پروژه‌های تونلسازی و راه‌سازی وزارت راه و شهرسازی وجود دارد. از این‌رو لزوم طراحی سازه‌های انبار مربوط به نگهداری مواد منفجره و چاشنی آنها به شدت باید مورد توجه و باز طراحی جهت تأمین اصول پدافند غیرعامل قرار گیرد تا در شرایط اضطرار و بحران معادن کشور ایمن و محفوظ گردند.

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Journal of Analytical and Numerical Methods in Mining Engineering
Volume 9, Issue 21
February 2020
Pages 69-81

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History

  • Receive Date: 12 July 2017
  • Revise Date: 14 October 2019
  • Accept Date: 03 November 2019

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