Hindawi Publishing Corporation Advances in Materials Science and Engineering Volume 2013, Article ID 420136, 7 pages http://dx.doi.org/10.1155/2013/420136 Research Article Performance of Hybrid Steel Fibers Reinforced Concrete Subjected to Air Blast Loading Mohammed Alias Yusof, 1 Norazman Mohamad Nor, 1 Ariffin Ismail, 2 Ng Choy Peng, 1 Risby Mohd Sohaimi, 1 and Muhammad Azani Yahya 1 1 Faculty of Engineering, Universiti Pertahanan Nasional Malaysia, Kem Sungai Besi, 57000 Kuala Lumpur, Malaysia 2 Faculty of Defence Management and Studies, Universiti Pertahanan Nasional Malaysia, Kem Sungai Besi, 57000 Kuala Lumpur, Malaysia Correspondence should be addressed to Mohammed Alias Yusof; alias.yusof@yahoo.com Received 14 May 2013; Revised 11 September 2013; Accepted 16 September 2013 Academic Editor: Gonang Xie Copyright © 2013 Mohammed Alias Yusof et al. Tis is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Tis paper presents the results of the experimental data and simulation on the performance of hybrid steel fber reinforced concrete (HSFRC) and also normal reinforced concrete (NRC) subjected to air blast loading. HSFRC concrete mix consists of a combination of 70% long steel hook end fbre and also 30% of short steel hook end fbre with a volume fraction of 1.5% mix. A total of six concrete panels were subjected to air blast using plastic explosive (PE4) weighing 1 kg each at standof distance of 0.3 meter. Te parameters measured are mode of failure under static and blast loading and also peak overpressure that resulted from detonation using high speed data acquisition system. In addition to this simulation work using AUTODYN was carried out and validated using experimental data. Te experimental results indicate that hybrid steel fber reinforced concrete panel (HSFRC) possesses excellent resistance to air blast loading as compared to normal reinforced concrete (NRC) panel. Te simulation results were also found to be close with experimental data. Terefore the results have been validated using experimental data. 1. Introduction Terrorists attack on buildings and infrastructures has become a global phenomenon. In most cases, the terrorists used explosives located in vehicles and blew it up at a close distance from the target. Intensive shock waves are created by this explosion which propagates outward at supersonic velocity accompanied by heat and light that induce pressure on the structural buildings and causes signifcant damage to the structure and loss of life. Tere are a number of methods to stop the terrorist attack. One of the methods is gathering information on the terrorist and stopping the attack before it takes place; another way is to protect buildings from damage by incorporating blast resistance design and also retroftting of the existing structure [1]. Tis area of research is currently receiving more attention from many structural engineers as they began to consider blast loading and also blast resistance materials in their design in order to protect important buildings and structures from such attacks. Concrete is one of the most widely used construction materials for structures because it possesses considerable mass per unit cost compared to other construc- tion materials and has excellent fre resistance and is able to absorb large amounts of energy [2]. However, one of the disadvantages of concrete is that it has a very low resistance against tensile stress and also possesses low ductility. From previous research it was found that mechanical properties of the concrete can be improved by adding fbers into the mix. Otter and Naaman reported that the addition of fbre in the concrete has signifcant efect on strength and toughness of concrete [3]. Te test results of Nagarkar and Tambe indicated that the compressive, split tensile, and fexural strength of concrete are increased by the addition of fbre [4]. Te strengthening mechanism of fbre involves transfer of stress from matrix to the fbre by interlocking the fbers and matrices when the fbre surface is deformed. Te stress is thus shared by the fbers and matrix in tension, until the matrix cracks and then the total stress is progressively