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Experimental Testing of CFRP-Strengthened Reinforced Concrete Slab Elements Loaded by Close-In Blast

Orton, Sarah L. / Chiarito, Vincent P. / Minor, Jared K. / Coleman, Thomas G.

Strengthening reinforced concrete slab or wall structural elements with carbon fiber-reinforced polymer (CFRP) can improve their blast resistance. However, close-in blasts (blasts with a scaled range of less than $0.4 m / {kg}^{1 / 3}$ ) may undermine the effectiveness of the CFRP strengthening. This paper presents an experimental testing program on CFRP-strengthened reinforced concrete slab specimens that utilized fiber anchors. Two CFRP mitigation designs were tested under blast loads with a scaled range of 0.4 and $0.6 m / {kg}^{1 / 3}$ . Tests on unmitigated reinforced concrete slab specimens provided baseline comparisons. The experimental results showed that the use of CFRP strengthening improved the blast resistance of reinforced concrete slab specimens. For a larger scaled range, $0.6 m / {kg}^{1 / 3}$ , the CFRP successfully prevented flying debris and reduced the overall deflections of the slab specimens. However, for the closer scaled range, $0.4 m / {kg}^{1 / 3}$ , the high shock blast pressures shattered the concrete through the thickness of the slab specimen and tore through the back-face CFRP. However, back-face velocity and overall deflections were reduced by about 75% compared to the baseline test slab specimen.

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Experimental Testing of CFRP-Strengthened Reinforced Concrete Slab Elements Loaded by Close-In Blast

Orton, Sarah L. / Chiarito, Vincent P. / Minor, Jared K. / Coleman, Thomas G.

Strengthening reinforced concrete slab or wall structural elements with carbon fiber-reinforced polymer (CFRP) can improve their blast resistance. However, close-in blasts (blasts with a scaled range of less than $0.4 m / {kg}^{1 / 3}$ ) may undermine the effectiveness of the CFRP strengthening. This paper presents an experimental testing program on CFRP-strengthened reinforced concrete slab specimens that utilized fiber anchors. Two CFRP mitigation designs were tested under blast loads with a scaled range of 0.4 and $0.6 m / {kg}^{1 / 3}$ . Tests on unmitigated reinforced concrete slab specimens provided baseline comparisons. The experimental results showed that the use of CFRP strengthening improved the blast resistance of reinforced concrete slab specimens. For a larger scaled range, $0.6 m / {kg}^{1 / 3}$ , the CFRP successfully prevented flying debris and reduced the overall deflections of the slab specimens. However, for the closer scaled range, $0.4 m / {kg}^{1 / 3}$ , the high shock blast pressures shattered the concrete through the thickness of the slab specimen and tore through the back-face CFRP. However, back-face velocity and overall deflections were reduced by about 75% compared to the baseline test slab specimen.

Experimental Testing of CFRP-Strengthened Reinforced Concrete Slab Elements Loaded by Close-In Blast

Orton, Sarah L. / Chiarito, Vincent P. / Minor, Jared K. / Coleman, Thomas G.

Strengthening reinforced concrete slab or wall structural elements with carbon fiber-reinforced polymer (CFRP) can improve their blast resistance. However, close-in blasts (blasts with a scaled range of less than $0.4 m / {kg}^{1 / 3}$ ) may undermine the effectiveness of the CFRP strengthening. This paper presents an experimental testing program on CFRP-strengthened reinforced concrete slab specimens that utilized fiber anchors. Two CFRP mitigation designs were tested under blast loads with a scaled range of 0.4 and $0.6 m / {kg}^{1 / 3}$ . Tests on unmitigated reinforced concrete slab specimens provided baseline comparisons. The experimental results showed that the use of CFRP strengthening improved the blast resistance of reinforced concrete slab specimens. For a larger scaled range, $0.6 m / {kg}^{1 / 3}$ , the CFRP successfully prevented flying debris and reduced the overall deflections of the slab specimens. However, for the closer scaled range, $0.4 m / {kg}^{1 / 3}$ , the high shock blast pressures shattered the concrete through the thickness of the slab specimen and tore through the back-face CFRP. However, back-face velocity and overall deflections were reduced by about 75% compared to the baseline test slab specimen.

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Titel:

Experimental Testing of CFRP-Strengthened Reinforced Concrete Slab Elements Loaded by Close-In Blast

Beteiligte:

Orton, Sarah L. (Autor:in) / Chiarito, Vincent P. (Autor:in) / Minor, Jared K. (Autor:in) / Coleman, Thomas G. (Autor:in)

Erschienen in:

Journal of Structural Engineering ; 140

Erscheinungsdatum:

09.02.2013

ISSN:

0733-9445 , 1943-541X

DOI:

https://doi.org/10.1061/(ASCE)ST.1943-541X.0000821

Medientyp:

Aufsatz (Zeitschrift)

Format:

Elektronische Ressource

Sprache:

Unbekannt

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