Experimental Research on Composite Action of Concrete-filled RPC Tube under Axial Load
Abstract
An innovative composite structure, named concrete-filled RPC tube (CFRT), was presented in the paper. In this system, high-strength stirrups are arranged in prefabricated reactive powder concrete (RPC) tube, and concrete is then casted into RPC tube. Total fifteen large-scale columns were designed and conducted for axial compression test, including nine CFRT specimens, three high-strength stirrup confined concrete (HSCC) specimens and three hollow RPC tubes. Composite action between the RPC tube and internal concrete as well as the spiral stirrup spacing was considered as the main factors in tests. The results show that only slightly cracking without any spalling occurs at the RPC tube of CFRT column when axial load approaches its peak value. Meanwhile, the axial load-carrying capacity of CFRT column is higher than the sum of that of hollow RPC tube and internal concrete, indicating this composite system realizes the superposition effect. The compressive properties of CFRT columns are also improved with the decrease of spacing of stirrups. Moreover, based on Mander model and the corresponding simplifications, contribution ratio of RPC tube for load-carrying capacity of CFRT columns was quantified, and its value increased from 0.22 to 0.26 with the increasing stirrup ratio. Furthermore, a calculation method for load-carrying capacity of CFRT was proposed.
Keywords: reactive powder concrete(RPC), confinement, high-strength stirrup, axial compressive load, composite action
Full Text:
PDFReferences
XU Peifu. WANG Cuikun. XIAO Congzhen. Development and prospect of high-rise building structures in China [J]. Building Structure, 2009(9) :28 - 32. (In Chinese)
ZHONG Shantong. Concrete-filled steel tubular structures [J]. Beijing: Tsinghua University Press, 2003:1-33,420 - 464. (In Chinese)
YE Lieping, FENG Peng. Applications and development of fi-ber-reinforced polymer in engineering structures [J]. China Civil Engineering Journal. 2006, 39(3) :24 - 36. (In Chinese)
BAYARD O. Fracture mechanics of reactive powder concrete; material modeling and experimental investigations [J]. Engineering Fracture Mechanics, 2003, 70(7) :839 - 851.
CAI Shaohuai. Modern steel tube confined concrete structures [J]. Beijing; China Communication Press, 2003; 4 -5. (In Chinese)
HUOJ. HUANG G, XIAO Y. Effects of sustained axial load and cooling phase on post-fire behavior of concrete-filled steel tubular stub columns [J]. Journal of Constructional Steel Research. 2009, 65(8);1664- 1676.
LI Guoqiang, WU Bo. HAN Linhai. Development of the research on fire-resistance of structures [J]. Progress in Steel Building Structures. 2006. 8(1) ; 1 - 13. (In Chinese)
YANG H . HAN L H . WANG Y. Effects of heating and loading histories on post-fire cooling behavior of concrete-filled steel tubular columns[J]. Journal of Constructional Steel Research. 2008. 64(5):556 -570.
RICHARD P. CHEYREZY M. Composition of reactive powder concretes [J]. Cement and Concrete Research, 1995. 25 (7):1501 -1511.
RIC HARD P. Reactive powder concrete; a new ultra-high-strength cementitious material[C]//Proceedings of 4th International Symposium on Utilization of High Strength. High Performance Concrete. Paris, France; Presses des Ponts et Chaussees, 1996: 1343-1349.
KEN Liang, FANG Zhi, WANG Cheng. Seismic behavior analysis of RPC box piers based on the fiber element model [J]. Journal of Hunan University: Natural Sciences, 2013, 40 (8); 16- 21. (In Chinese)
ZHENG Wenzhong, LUO Baifu. WANG Ying. Compressive properties of cubes reactive powder concrete with hybrid fibers at elevated temperature [J]. Journal of Hunan University; Natural Sciences* 2012. 39(11): 13-19. (In Chinese)
Refbacks
- There are currently no refbacks.