Evaluation of Local Damages and Residual Performance of Blast Damaged RC Beams Strengthened with Steel Fiber and FRP Sheet

Lee, Jin Young; Jang, Dae Sung; Kwon, Ki Yeon; Yoon, Young Soo

doi:10.4334/jkci.2014.26.5.627

Cited by 4 publications

(7 citation statements)

References 17 publications

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“…Static flexural tests on the intact and damaged specimens were performed by Lee et al [11,12], and the test results were cited to evaluate the effect of CFRP sheet, steel fibers, and shear reinforcement in RC beams. All of the tests on intact, damaged, and repaired specimens were conducted using identical instrumentation.…”

Section: Materials Properties the Concrete Properties And MIX Proportmentioning

confidence: 99%

“…Close-in blast tests on specimens were carried out by Lee et al [11,12]. The local damages and effect of CFRP sheet, steel fibers, and shear reinforcement were investigated by analyzing the test results.…”

Section: Close-in Blast Testmentioning

confidence: 99%

“…When maintaining a stand-off distance is difficult, the structures should be constructed by using the reinforcing method that can protect themselves from blasts. Therefore, numerous researchers [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] have conducted studies to suggest the enhanced reinforcing method against a blast and evaluate the blast resistance of the suggested method. The conventional method to increase the blast resistance is to use a considerable amount of shear reinforcement.…”

Section: Introductionmentioning

confidence: 99%

“…Accordingly, in this study, blast-induced local damages and static flexural strength of intact, damaged, and repaired specimens were examined. The test data of the flexural test on intact specimens and blast test was cited from previous studies [11,12]. The amount and spacing of shear reinforcements, the addition of steel fiber, and FRP retrofitting were considered as test variables to investigate the effect of the various reinforcing methods on blast-local damages.…”

Section: Introductionmentioning

confidence: 99%

“…For the flexural test on repaired specimens, the specimens were fabricated by using SFRCC, CFRP sheet, and blast-damaged specimens that were tested in the previous study and tested to investigate the effect of repairing materials on flexural strength of repaired specimens. Five reinforced RC beams were tested, and the test data of ten specimens were cited to investigate the effect of CFRP sheet, steel fibers, and shear reinforcement in RC beams under blast load [11,12]. The details of the specimens are shown in Figure 1 and Table 1.…”

Section: Introductionmentioning

confidence: 99%

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Flexural Assessment of Blast-Damaged RC Beams Retrofitted with CFRP Sheet and Steel Fiber

Lee

Shin

Min

et al. 2018

International Journal of Polymer Science

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This study presents the effects of blast-induced local damages on the flexural strength of blast-damaged and repaired specimens. In the experimental program, blast-damaged specimens were repaired with steel fiber reinforced cementitious composite (SFRCC) as well as carbon fiber-reinforced polymer (CFRP) sheets and tested for flexural strength measurements. The test parameters included shear reinforcement (amount and spacing), steel fiber content (0, 1.0 vol%), and retrofitting with CFRP sheets. The test results indicated that the use of higher amounts of stirrups demonstrated insignificant benefits in preventing local damages. However, it was shown that the use of small-diameter steel bars for stirrups with small spacing could decrease the local damages more effectively compared to the large-diameter steel reinforcement. For the residual strength of the damaged specimens, the specimens using more stirrups could resist over 60% of their original flexural strength. CFRP retrofitting showed insignificant enhancement in ductility of intact, damaged, and repaired specimens. However, it distributed the blast load and protected debris scattering. The addition of steel fibers results in increased ductility and enhanced blast resistance against local damages. All specimens, excluding control specimen, that repaired with SFRCC showed higher flexural strength to their original strength. Therefore, it can be concluded that replacing damaged concrete cover with SFRCC is adequate for repairing the blast-damaged RC members.

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Section: Materials Properties the Concrete Properties And MIX Proportmentioning

confidence: 99%

Section: Close-in Blast Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Flexural Assessment of Blast-Damaged RC Beams Retrofitted with CFRP Sheet and Steel Fiber

Lee

Shin

Min

et al. 2018

International Journal of Polymer Science

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Experimental Study on the Propagation Law of Explosive Stress Wave in Cement Mortar with Weak Layers

et al. 2022

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The weak layer has good attenuation performance when it comes to the explosive stress wave, which can be used in protective structures. In this paper, a cement mortar specimen was designed, cast, and tested. Under inner explosion, due to the expansion of air in the explosive hole, the tensile cracks formed around the explosive hole are mainly in a damage pattern. In ordinary cement mortar, the transmittance is decreasing as the distance increases. At a distance of 8 cm to 14 cm from the explosive center, the average transmittance is 50.16%, 12 cm to 18 cm, while the average transmittance is 62.89%, increasing by 12.73%. Adding one weak layer into the cement mortar, the transmittance of one weak layer is 43.37%. The effect of increasing weak layers in short spacing is not obvious, and the transmittance of the second and third weak layer is about 80%, much less than the first layer. The softer the weak layer and the larger the wave impedance, the smaller the transmission coefficient is. The research proves that the weak layer has excellent attenuation performance when it comes to the explosive stress wave.

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Evaluation on Rear Fracture Reduction and Crack Properties of Cement Composites with High-Velocity Projectile Impact by Fiber Types

Han¹,

Kim²,

Kim³

et al. 2015

Journal of the Korea Concrete Institute

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Cement composites subjected to high-velocity projectile shows local failure and it can be suppressed by improvement of flexural toughness with reinforcement of fiber. Therefore, researches on impact resistance performance of cement composites are in progress and a number of types of fiber reinforcement are being developed. Since bonding properties of fiber with matrix, specific surface area and numbers of fiber are different by fiber reinforcement type, mechanical properties of fiber reinforced cement composites and improvement of impact resistance performance need to be considered. In this study, improvement of flexural toughness and failure reduction effect by impact of high-velocity projectile have been evaluated according to fiber type by mixing steel fiber, polyamide, nylon and polyethylene which are have different shape and mechanical properties. As results, flexural toughness was improved by redistribution of stress and crack prevention with bridge effect of reinforced fibers, and scabbing by high-velocity impact was suppressed. Since it is possible to decrease scabbing limit thickness from impact energy, thickness can be thinner when it is applied to protection. Scabbing of steel fiber reinforced cement composites was occurred and it was observed that desquamation of partial fragment was suppressed by adhesion between fiber and matrix. Scabbing by high-velocity impact of synthetic fiber reinforced cement composites was decreased by microcrack, impact wave neutralization and energy dispersion with a large number of fibers.

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Evaluation of Local Damages and Residual Performance of Blast Damaged RC Beams Strengthened with Steel Fiber and FRP Sheet

Cited by 4 publications

References 17 publications

Flexural Assessment of Blast-Damaged RC Beams Retrofitted with CFRP Sheet and Steel Fiber

Flexural Assessment of Blast-Damaged RC Beams Retrofitted with CFRP Sheet and Steel Fiber

Experimental Study on the Propagation Law of Explosive Stress Wave in Cement Mortar with Weak Layers

Evaluation on Rear Fracture Reduction and Crack Properties of Cement Composites with High-Velocity Projectile Impact by Fiber Types

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