Strength of Improved Pipe-Concrete Elements of Square Cross-Section

The aim of the work is experimental and theoretical study of the power resistance of short centrally compressed pipe-concrete elements (PCE) of square cross-section to identify the effectiveness of the use of spiral reinforcement in them. Studies have shown that the use of a relatively small amount of spiral reinforcement (about 1%) made it possible to increase the effect of the cage of pipe concrete structures by about 1.3 times. Only due to the spiral reinforcement the strength of centrally compressed pipe-concrete samples, made of concrete of B40 class, increased by 25%, and of B80class concrete– 40%. A method for calculating the strength of centrally compressed PCE of square-section, including those with spiral reinforcement, is proposed. The method takes into account the growth of strength and deformability of the concrete core due to the simultaneous use of two types of indirect reinforcement – in the form of an outer steel shell and spiral reinforcement.

A.L. KRISHAN1 , Doctor of Sciences (Engineering), (This email address is being protected from spambots. You need JavaScript enabled to view it.);
V.I. RIMSHIN² , Doctor of Sciences (Engineering), Corresponding Member of RAACS (This email address is being protected from spambots. You need JavaScript enabled to view it.);
M.A. ASTAFIEVA¹ , Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Nosov Magnitogorsk State Technical University (38, Lenin Avenue, 455000, Magnitogorsk, Chelyabinsk Region, Russian Federation)
² Scientific-Research Institute of Building Physics of the Russian Academy architecture and construction sciences (21, Lokomotivniy Driveway, Moscow,127238, Russian Federation)

1. Кришан А.Л., Мельничук А.С. Прочность трубобетонных колонн квадратного поперечного сечения. Монография: Магнитогорск: Изд-во Магнитогорск. гос. техн. ун-та им. Г.И. Носова. 2013. 105 с. 1. Krishan A.L., Mel’nichuk A.S. Prochnost’ trubobetonnykh kolonn kvadratnogo poperechnogo secheniya. Monografiya [Strength of pipe-concrete columns of square cross-section. Monograph]. Magnitogorsk: Publishing house of Magnitogorsk state technical university named after G.I. Nosov. 2013. 105 p.

2. Han L.H., Yao G.H., Tao Z. Perfomance of concretefilled thin-walled steel tubes under pure tosion. Journal of Thin-Walled Structures. 2007. Vol. 45, pp. 24–36.

3. Masoudnia R., Amiri S., WanBadaruzzaman W.H. An Analytical model of short steel box columns with concrete in-fill (part I). Australian Journal of Basic and Applied Sciences. 2011. No. 5, pp. 1715–1721.

4. Naeej M., Bali M., Naeej M.R. and Amir J.V. Prediction of lateral confinement coefficient in reinforced concrete columns using M5’ machine learning method. Journal of Civil Engineering. 2013. No. 17 (7), pp. 1714–1719.

5. Yu T., Teng J.G. Behavior of hybrid FRP-concrete-steel double-skin tubular columns with a square outer tube and a circular inner tube subjected to axial compression. Journal of Composites for Construction. 2013. Vol. 17, pp. 271–279.

6. Nishiyama I., Morino S., Sakino K., Nakahara H. Summary of research on concrete-filled structural steel tube column system carried out under the US-JAPAN Cooperative Research Program on composite and hybrid structures. Japan. 2002. 176 p.

7. Кришан А.Л., Кришан М.А., Сабиров Р.Р. Перспективы применения трубобетонных колонн на строительных объектах России // Вестник Магнитогорского государственного технического университета им. Г.И. Носова. 2014. № 1 (45). С. 137–140. 7. Krishan A.L., Krishan M.A., Sabirov R.R. Prospects for the application of pipe-concrete columns at construction sites in Russia. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta im. G.I. Nosova. 2014. No. 1 (45), pp. 137–140. (In Russian).

8. Han L.H., An Y.H. Perfomans of concrete-encased CFST stub columns under axial compression. Journal of Constructional Steel Research. 2014. Vol. 93, pp. 92–76.

9. Jayasooriya R., Thambiratnam D.P., Perera N.J. Blast response and safety evaluation of a composite column for use as key element in structural systems. Engineering Structures. 2014. Vol. 61. No. 1, pp. 31–43.

10. Yu Q., Tao Z., Wu Y.X. Experimental behaviour of high performance concrete-filled steel tubular columns. ThinWalled Structures. 2008. Vol. 46 (4), pp. 362–370. 11. Трубобетонные колонны высотных зданий из высокопрочного бетона в США // Бетон и железобетон. 1992. № 1. С. 29–30.

11. Tube-concrete columns of high-rise buildings made of high-strength concrete in the USA. Beton i zhelezobeton. 1992. No. 1, pp. 29–30. (In Russian).

12. Цай Шаохуай. Новейший опыт применения трубобетона в КНР // Бетон и железобетон. 2001. № 3. С. 20–24.

12. Tsai Shaokhuai. The latest experience of using pipeconcrete in the PRC. Beton i zhelezobeton. 2001. No. 3, pp. 20–24. (In Russian).

13. Han L-H., Li W., Bjorhovde R. Developments and advanced applications of concrete filled steel tubular (CFST) structures. Journal of Constructional Steel Research. 2014. No. 100, pp. 211–228.

14. Карпенко Н.И. Общие модели механики железобетона. М.: Стройиздат, 1996. 416 с.
14. Karpenko N.I. Obshchie modeli mekhaniki zhelezobetona [General models of mechanics of reinforced concrete]. Moscow: Stroiizdat. 1996. 416 p. 15. Кришан А.Л., Астафьева М.А., Сабиров Р.Р. Расчет и конструирование трубобетонных колонн. Монография: Saarbrucken, Deutschland: Palmarium Academic Publishing. 2016. 261 с.

15. Krishan A.L., Astaf’eva M.A., Sabirov R.R. Raschet i konstruirovanie trubobetonnykh kolonn. Monografiya [Calculation and construction of pipe-concrete columns. Monograph]. Saarbrucken, Deutschland: Palmarium Academic Publishing. 2016. 261 p.

16. Liang Q.Q., Uy B., Richard Liew J.Y. Nonlinear analysis of concrete-filled thin-walled steel box columns with local buckling effects. Journal of Constructional Steel Research. 2006. Vol. 62, pp. 581–591.