Analytical study of reinforced concrete slabs with Ferrocement under blast load

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tajvar Amir hussain; NASSERASADI KIARASH; Moradlou javad

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:1 Page(s): 31-42

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Title

Analytical study of reinforced concrete slabs with Ferrocement under blast load

Author(s)

tajvar Amir hussain | NASSERASADI KIARASH | Moradlou javad | Issue Writer Certificate

Keywords

rehabilitationQ1

explosionQ1

steel wire meshQ1

panelQ1

Abstract

Reduction of social and financial losses and rehabilitation in important buildings as a result of terrorist attacks and accidental blast is vital. In this regards, using concrete slabs as a protective shield is one of the main methods of protection. Currently, many methods have been used for improve the behavior of this element such as FRP sheets, fibers, high strength concrete and composite concretes. But these methods either increase the dead load of structure or are costly and use high-tech methodology and needed very high skilled worker for implementation. In this paper, the behavior of RC slabs reinforced with steel wire mesh which is easy to implement and cheap was studied analytically under blast loads. To this goal, effect of different parameters such as number of wire meshes, slab thinness and concrete strength on maximum slab displacement, damage areas and performance of slabs were studied analytically under the various blast loads. First the model was calibrated to an existing experimental and analytical study of blast and impact modeling of slabs with wire mesh. The crack in concrete was modeled by the smeared crack methodology in which the radios of damaged concrete under the blast load can be identified. Then numerous slabs with different thickness (40, 60 and 80 mm), concrete strength (30, 40 and 50 MP), different layers of wire mesh (0, 1, 2, 3) where considered. The selected slabs were analyzed with a general FEM software under a various range of blast loads (Z=D/W1/3 equal to 0. 431, 0. 488, 0. 518, 0. 591 and 0. 648). The results have shown that increasing of slab thickness, concrete strength and adding different layers of wire mesh reduces the slab displacement and the damage area. Due to higher damage in thin slabs (40 mm) and low concrete strength (30 MP), the effect of adding wire were higher in these slabs. The wire mesh reduces the damage ratio by 5 to 35 %. The most reduction occur in the three-layer mesh. The increase in the compression strength of the concrete also has significant effect on the reduction of damage radios. In general, adding the wire mesh reduce the displacement of the slabs by 25% and the reduction is more efficient in the thinner slabs with lower concrete strength. From the viewpoint of slab performance, which is defined by the amount of displacement and plastic rotation of hinges in the middle of slabs and its supports (limited to the 0. 035, 0. 07 and 0. 14 radian for immediate occupancy, life safety and Collapse prevention respectively), it is observed that the performance of thicker slabs (60 and 80 mm) under the highest blast zone risk were in the life safety or immediate occupancy state. Using wire improved the performance of these slabs. In the thinner slab (40 mm) the performance of slab was lower than the life-safety state which was improved by adding the wire mesh.

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APA: Copy

tajvar, Amir hussain, NASSERASADI, KIARASH, & Moradlou, javad. (2018). Analytical study of reinforced concrete slabs with Ferrocement under blast load. MODARES CIVIL ENGINEERING JOURNAL, 18(1 ), 31-42. SID. https://sid.ir/paper/256666/en

Vancouver: Copy

tajvar Amir hussain, NASSERASADI KIARASH, Moradlou javad. Analytical study of reinforced concrete slabs with Ferrocement under blast load. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;18(1 ):31-42. Available from: https://sid.ir/paper/256666/en

IEEE: Copy

Amir hussain tajvar, KIARASH NASSERASADI, and javad Moradlou, “Analytical study of reinforced concrete slabs with Ferrocement under blast load,” MODARES CIVIL ENGINEERING JOURNAL, vol. 18, no. 1 , pp. 31–42, 2018, [Online]. Available: https://sid.ir/paper/256666/en

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