Mechanical Properties of the Section from Steel Tube-Reinforced Concrete Pier

Abstract:

To research the impact of inner concrete filled steel tubular (CFST) on the reinforced concrete (RC) pier confined by stirrups, a Matlab program based on fiber model was written to calculate the moment-curvature (M-ϕ) relationship. The program was utilized to compute the M-ϕ relationships of three piers with same longitudinal bars and stirrups, and the three piers were an ordinary RC pier confined by stirrups、a high strength reinforced concrete (HSRC) pier confined by stirrups and a steel tube-reinforced concrete (ST-RC) pier respectively. The rules about bearing capacity of section and curvature ductility along with axial load N were deliberated by comparing the numeral results of three piers. The ratio of peak moment M_k to yield moment M_y was defined as super coefficient λ_s, and the disciplinarian of λ_s along with N was discussed. Participation factor ξ referred to the ratio of the moment provided by inner CFST to the total moment of ST-RC pier, and the laws of ξ affected by ϕ and N were researched. The results show that ST-RC pier has higher ductility and higher bearing capacity of section, and ductility decreases more slowly than other piers with the increase of N. λ_s of ST-RC pier is highest among three piers in most cases. On conditions of different N, ξ shows different variation trend with curvature ϕ up, and the maximum of participation factor ξ_max is reckoned to be not affected by N basically.

• Periodical: Applied Mechanics and Materials (Volumes 744-746)
• Pages: 789-792
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.744-746.789
• Online since: March 2015
• Authors: Zhen Wang, Xiu Xin Wang*
• Keywords: Bearing Capacity of Section, Bridge Engineering, Concrete Filled Steel Tubular, Curvature Ductility, Pier, Stirrup-Confined Concrete

References

[1] X. Ji, H. Kang, X. Chen and J. Qian: Earthquake Engineering & Structural Dynamics, Vol. 43 (2014), p.487.

[2] R. Park and T. Paulay: Bulletin of the New Zealand Society for Earthquake Engineering, Vol. 8 (1975), p.70.

[3] W.D. Zhuo and L.C. Fan: China Civil Engineering Journal, Vol. 35 (2002), p.47 (in Chinese).

[4] L.H. Han, F.Y. Liao, Z. Tao and Z. Hong: Journal of Constructional Steel Research, Vol. 65 (2009), p.1607.

[5] Z.Z. Bai and F.T.K. Au: Magazine of Concrete Research, Vol. 61 (2009), p.345.

[6] G. Monti and E. Spacone: Journal of Structural Engineering, Vol. 126 (2000), p.654.

[7] B.D. Scott, R. Park and M.J.N. Priestley: Stress-strain behavior of concrete confined by overlapping hoops at low and high strain rates. In ACI Journal Proceedings. ACI. Vol. 79 (1982).

DOI: 10.14359/10875

[8] J.B. Mander, M.J.N. Priestley and R. Park: Journal of structural engineering, Vol. 114 (1988), p.1804.

[9] K.A.S. Susantha, H. Ge and T. Usami: Engineering Structures, Vol. 23 (2001), p.1331.

[10] L.H. Han and Y.F. Yang: The Technology of Modern Concrete Filled Steel Tube Structure (China Building Industry Press, Beijing 2004) (in Chinese).