Published

2018-05-01

Experimental investigation of 50 MPa reinforced concrete slabs subjected to blast loading

Investigación experimental de losas de concreto armado de 50 MPa sometidas a efecto de explosión

Keywords:

Blast effect, retrofitting, concrete slabs, non-confined explosive (en)
Efecto de explosión, protección, losas de concreto, explosivo no confinado (es)

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Authors

  • Fausto Mendonça Technological Institute of Aeronautics Department of Chemistry Pca Mal Eduardo Gomes, 50 São Jose dos Campos - SP - Brasil 12228-900
  • Girum Urgessa George Mason University 4400 University Drive, MS 6C1 Fairfax, VA, 22030 - USA
  • José Rocco Technological Institute of Aeronautics Department of Chemistry Pca Mal Eduardo Gomes, 50 São Jose dos Campos - SP - Brasil 12228-900
This paper presents results from blast tests conducted on four 50 MPa concrete slabs with reinforcement ratios of 0,175% and 0,37%. Two of the slabs were retrofitted with 50 mm thick foam in order to investigate the potential of using the foam as a strengthening option. The slabs were simply supported on two sides. Non-confined PBX (Plastic bonded explosive) was molded with the form of a cylinder measuring 20 cm in height and 10,5 cm in diameter. The explosive was detonated at 2 m stand-off distance. The equivalent TNT mass of the explosive ranges from 2,58 to 2,72 kg for the four tests. Accelerometers, displacement and pressure gages were used to measure blast wave parameters and global response of the slabs. A high-speed digital camera in conjunction with a rugged notebook recorded images. Qualitative and quantitative results are included. Slabs retrofitted with foam showed a different pressure pattern as recorded by the sensors and resulted in higher displacement, acceleration and linear momentum.

Este documento presenta los resultados de una prueba experimental de efecto de explosiones y de instrumentación desde el subconjunto de cuatro losas de concreto de 50 MPa con ratios de refuerzo del 0,175% y 0,37%. Dos de las losas han sido protegidas con una espuma de poli estireno expandido con 50 mm de espesor para poder comprobar la capacidad que tiene la espuma de modificar la respuesta a la explosión. Las losas se apoyaron en dos lados. El explosivo plástico PBX (por las siglas en inglés de plastic bonded explosive) no confinado fue moldeado en forma de cilindro teniendo 20 cm de alto y 10,5 cm de diámetro. El explosivo fue detonado a 2 metros de distancia. La masa de equivalente TNT de los explosivos varía entre 2,58-2,72 kg. Acelerómetros, medidores de desplazamientos y sensores de presión fueran utilizados para medir los parámetros de la onda de choque y la respuesta global de las losas. Una cámara digital de alta velocidad conectada a una computadora portátil robusta grabó las imágenes. Se incluyen datos resultados cualitativos y cuantitativos. Las losas con protección de espuma variaron el patrón de presión registrados por los sensores y resultó en un mayor desplazamiento, aceleración y el momento lineal.

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How to Cite

Experimental investigation of 50 MPa reinforced concrete slabs subjected to blast loading. (2018). Ingeniería E Investigación, 38(2), 27-33. https://doi.org/10.15446/ing.investig.v38n2.65305

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Copyright (c) 2018 Fausto Mendonça, Girum Urgessa, José Rocco

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