Effects of Concrete Strength and Reinforcing Clear Distance on the Damage of Reinforced Concrete Slabs Subjected to Contact Detonations

Morishita, Masahiro; Tanaka, Hideaki; Ando, Tomohiro; Hagiya, Hiroyuki

doi:10.3151/crt1990.15.2_89

Cited by 55 publications

(37 citation statements)

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“…These dimensions were the same as those in previous studies dealing with the blast resistance of single slab (Morishita et al 2000(Morishita et al , 2004Tanaka et al 2003;Yamaguchi et al 2008aYamaguchi et al , 2011. The curing age of the specimens for the contact detonation tests was the same as that in the material tests.…”

Section: Specimen Configurationsupporting

confidence: 49%

“…The values of the flexural toughness coefficient of the PEFRC were 9.52 MPa (in series 1) and 8.69 MPa (in series 2): the values of total damage depth (the sum of crater and spall depths) in single, 100-mm thick PEFRC slab by the 200 g explosive charge were estimated to be 55 mm (in series 1) and 59 mm (in series 2), based on previous studies (Yamaguchi et al 2008a(Yamaguchi et al , 2011. As for normal concrete, Morishita et al (2004) have clarified that the influence of concrete strength on the blast resistance of normal RC slab is negligible. Based on their method for estimating damage to normal RC slab, the failure mode of single, 100-mm thick normal RC slab by the 200 g explosive charge was estimated to be 'breaching'.…”

Section: Experimental Methods 211 Materials and MIX Proportionsmentioning

confidence: 99%

“…Among these, contact detonation is regarded as a standard for the other two cases. Until now, a number of experimental and numerical studies have been conducted regarding the evaluation of damage to normal RC slabs subjected to contact detonation (Hader 1985;McVay 1988;Kraus et al 1994;Nash et al 1995;Morishita et al 2000Morishita et al , 2004Tanaka et al 2003;Katayama et al 2007). Furthermore, the following techniques have been proposed for improving the blast resistance of RC slabs: one is strengthening with fiber reinforced polymer (FRP) composites (Muszynski et al 2003;Buchan et al 2007;Razaqpur et al 2007;Silva et al 2007) or steel plates (Lan et al 2005) on the back surface of the RC slab; the other technique is employing a fiber reinforced concrete as a slab material (Sun et al 1999;Banthia et al 2004;Lan et al 2005;Ngo et al 2007;Zhou et al 2008;Coughlin et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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Blast Resistance of Double-Layered Reinforced Concrete Slabs Composed of Precast Thin Plates

Yamaguchi

Murakami

Takeda

et al. 2011

ACT

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When designing blast-resistant reinforced concrete (RC) structures, reducing spall damage due to reflected tensile stress waves is a major problem. Furthermore, for rapid construction of the blast-resistant structures against sudden terrorist bomb attacks, it is necessary to build it with precast concrete walls and reduce the weight of the precast elements by reducing their size for ease of transportation and construction. In this study, to propose an idea for rapid construction and better blast resistance of blast-resistant RC structures, double-layered RC slabs composed of precast thin plates, 50 mm thick, were fabricated and utilized for contact detonation tests. The tests were conducted under a condition that the amount of explosives and the dimensions of specimen were constant respectively, and two types of concrete, normal concrete and polyethylene fiber reinforced concrete (PEFRC), were employed as the slab materials. Our results showed that creating an air cavity between the two layers of PEFRC slab was effective in reducing spall damage, while the air space had no advantage in normal RC, under a condition that the thickness of the air space was fixed at 15 mm. Furthermore, the above difference between PEFRC and normal RC slabs was discussed, based on the numerical result on the fracture process of the air-sandwiched normal RC slab.

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Section: Specimen Configurationsupporting

confidence: 49%

Section: Experimental Methods 211 Materials and MIX Proportionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Blast Resistance of Double-Layered Reinforced Concrete Slabs Composed of Precast Thin Plates

Yamaguchi

Murakami

Takeda

et al. 2011

ACT

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show abstract

“…For emulsion explosives, the thermal energy is 4.61 MJ/kg, which is calculated by heat of explosion (1100 kcal/kg) of NewMITE Plus. In addition, the value of the thermal energy of TNT was used 4.29 MJ/kg with reference to the previous work by Morishita et al (2000Morishita et al ( , 2004. Thus, the ratio of the thermal energy between TNT and emulsion explosives is 1.07.…”

Section: Contact-blast Testsmentioning

confidence: 99%

“…In particular, Morishita et al (2000), Morishita et al (2004) and Tanaka and Tuji (2003) reported that the space between reinforcing bars and the compressive strength of concrete were not effective indicators for predicting the local damage and breaking point of a concrete slab through contact-blast testing. Moreover, according to the test results performed by Nam et al (2011), the blast resistance of RC specimen was obviously not influenced by the reinforcement of steel bar.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Blast Resistance of Fiber-Reinforced Cementitious Composite Panels Subjected to Contact Explosions

Nam

Kim

2017

Int J Concr Struct Mater

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This study investigates the blast resistance of fiber-reinforced cementitious composite (FRCC) panels, with fiber volume fractions of 2%, subjected to contact explosions using an emulsion explosive. A number of FRCC panels with five different fiber mixtures (i.e., micro polyvinyl alcohol fiber, micro polyethylene fiber, macro hooked-end steel fiber, micro polyvinyl alcohol fiber with macro hooked-end steel fiber, and micro polyethylene fiber with macro hooked-end steel fiber) were fabricated and tested. In addition, the blast resistance of plain panels (i.e., non-fiber-reinforced high strength concrete, and non-fiberreinforced cementitious composites) were examined for comparison with those of the FRCC panels. The resistance of the panels to spall failure improved with the addition of micro synthetic fibers and/or macro hooked-end steel fibers as compared to those of the plain panels. The fracture energy of the FRCC panels was significantly higher than that of the plain panels, which reduced the local damage experienced by the FRCCs. The cracks on the back side of the micro synthetic fiber-reinforced panel due to contact explosions were greatly controlled compared to the macro hooked-end steel fiber-reinforced panel. However, the blast resistance of the macro hooked-end steel fiber-reinforced panel was improved by hybrid with micro synthetic fibers.

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Critical Condition of Reinforced Concrete Roof Slab Failure Under Blast and its Blast Resistance Design Method

Ren

Zhang

Wang

2022

J Fail. Anal. and Preven.

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Effects of Concrete Strength and Reinforcing Clear Distance on the Damage of Reinforced Concrete Slabs Subjected to Contact Detonations

Cited by 55 publications

References 0 publications

Blast Resistance of Double-Layered Reinforced Concrete Slabs Composed of Precast Thin Plates

Blast Resistance of Double-Layered Reinforced Concrete Slabs Composed of Precast Thin Plates

Experimental Investigation on the Blast Resistance of Fiber-Reinforced Cementitious Composite Panels Subjected to Contact Explosions

Critical Condition of Reinforced Concrete Roof Slab Failure Under Blast and its Blast Resistance Design Method

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