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Compressed Steel or Glass­Reinforced Plastic Shelled Concrete

A.L. Krishan1, Dr. Tech. Sci., professor, Director of the Institute of construction, architecture and art;
V.I. Rimshin2/sup>, corresponding member of Russian Academy of Architecture and Construction Sciences, Dr. Tech. Sci., professor, Head of the City Development Institute NIISF RAASN;
A.I. Sagadatov1, Cand. tech. Sci., associate professor of the department of building manufacturing;
E.A. Troshkina1, Cand. tech. Sci., associate professor of the department of building manufacturing
1Magnitogorsk State Technical University;
2 City Development Institute NIISF RAASN

Abstract. Experimental research of centrally compressed elements made of self­stressing steel or glass­reinforced plastic shelled concrete was conducted. Six series of short laboratory samples made of C40 and C80 concrete grades were tested under the conditions of short­time loading. Four series of samples had steel shell and two series had glass­reinforced plastic shell. All the shells had similar geometric parameters and strength properties. The purpose of the research was to compare the performance of samples from different series in terms of strength, deformability and fracture pattern. The research demonstrated that the samples made of steel shelled concrete with average and high strength had higher strength and lower deformability. The fracture pattern of these samples was closer to ductile one. Compressed elements with glass­reinforced plastic shell had brittle fracture pattern. The increase of elastic behavior limit was also provided by using self­stressing concrete in the samples.
Key words: concrete filled steel tube, glass­reinforced plastic shell, central compression, strength, deformability.

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