Steel and Composite Structures

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Cyclic and static behaviors of CFT modular bridge pier with enhanced bracings

  • Kim, Dongwook (Department of Civil Engineering, Chung Ang University) ;
  • Jeon, Chiho (Department of Civil Engineering, Chung Ang University) ;
  • Shim, Changsu (Department of Civil Engineering, Chung Ang University)
  • Received : 2015.11.11
  • Accepted : 2016.02.11
  • Published : 2016.04.30
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Abstract

Modular structures consist of standardized modules and their connections. A modular bridge pier is proposed to accelerate bridge construction. Multiple concrete-filled steel tubes (CFTs) using commercial steel tubes were chosen as the main members. Buckling restrained bracings and enhanced connection details were designed to prevent premature low-cycle fatigue failure upon cyclic loading. The pier had a height of 7.95 m, widths of 2.5 m and 2.0 m along the strong and weak axis, respectively. Cyclic tests were performed on the modular pier to investigate structural performance. Test results showed that four CFT columns reached yielding without a premature failure of the bracing connections. The ultimate capacity of the modular pier was reasonably estimated based on the plastic-hinge-analysis concept. The modular CFT pier with enhanced bracing showed improved displacement ductility without premature failure at the welding joints.

Keywords

Acknowledgement

Supported by : Ministry of Land, Transportation and Maritime Affairs(MLTM)

References

  1. AASHTO (2010), LRFD Bridge Design Specifications, (3rd Ed.), American Association of State Highway and Transportation Officials, Washington, D.C., USA
  2. ACI Committee 318 (2014), Building Code Requirements for Structural Concrete (ACI318-11) and Commentary, American Concrete Institute.
  3. ACI Committee 408 (2001), Splice and Development Length of High Relative Rib Area Reinforcing Bars in Tension (408.3-01) and Commentary (408.3R-01), American Concrete Institute, Farmington Hills, MI, USA.
  4. AISC (2005), Specification for Structural Steel Buildings, ANSI/AISC 360-05, American Institute of Steel Construction, Inc., Chicago, IL, USA.
  5. American Association of State Highway and Transportation Officials (2010), AASHTO LRFD Bridge Design Specification, (5th Edition).
  6. Chou, C.C. and Chen, Y.C. (2006), "Cyclic tests of post-tensioned precast CFT segmental bridge columns with unbounded strands", Earthq. Eng. Struct. Dyn., 35(2), 159-175. https://doi.org/10.1002/eqe.512
  7. D'Aniello, M. (2007), "Steel dissipative bracing systems for seismic retrofitting of existing structures: Theory and testing", Ph.D. Thesis; University of Naples "Federico", Naples, Italy.
  8. Elgawady, M.A. and Dawood, H.M. (2012), "Analysis of segmental piers consisted of concrete filled FRP tubes", Eng. Struct., 38, 142-152. https://doi.org/10.1016/j.engstruct.2012.01.001
  9. Ellobody, E., Young, B. and Lam, D. (2006), "Behaviour of normal and high strength concrete-filled compact steel tube circular stub columns", J. Construct. Steel Res., 62(7), 706-715. https://doi.org/10.1016/j.jcsr.2005.11.002
  10. Eurocode 4 (2004), Design of Composite Steel and Concrete Structures-Part 1-1: General Rules and Rules for Buildings, EN1994-1, Brussels, Belgium.
  11. FMI Corporation (2013), Prefabrication and Modularization in Construction.
  12. Gu, Q., Zona, A., Peng, Y. and Dall'Asta, A. (2014), "Effect of buckling-restrained brace model parameters on seismic structural response", J. Construct. Steel Res., 98, 100-113. https://doi.org/10.1016/j.jcsr.2014.02.009
  13. Hassan, M.M., Ramadan, H.M., Abdel-Mooty, M.N. and Mourad, S.A. (2014), "Behavior of concentrically loaded CFT braces connections", J. Adv. Res., 5(2), 243-252. https://doi.org/10.1016/j.jare.2013.03.005
  14. Hu, H.T., Su, F.C. and Elchalakani, M. (2010), "Finite element analysis of CFT columns subjected to pure bending moment", Steel Compos. Struct., Int. J., 10(5), 415-428. https://doi.org/10.12989/scs.2010.10.5.415
  15. Kim, J. and Choi, H. (2003), "Behavior and design of structures with buckling-restrained braces", Eng. Struct., 26(6), 693-706. https://doi.org/10.1016/j.engstruct.2003.09.010
  16. Ma, H.W., Oh, H.C., Kim, D.W., Kong, D. and Shim, C.S. (2012), "Evaluation of Flexural Behavior of a Modular Pier with Circular CFT", J. Korean Soc. Steel Construct., 24(6), 725-734. [In Korean] https://doi.org/10.7781/kjoss.2012.24.6.725
  17. MagarPatil, H.R. and Jangid, R.S. (2015), "Development and analysis of passive hybrid energy dissipation system for steel moment resisting frame", Int. J. Civil Struct. Eng., 5(4), 339-352.
  18. McGraw Hill Construction (2011), Prefabrication and Modularization: Increasing Productivity in the Construction Industry.
  19. Roeder, C.W., Lehman, D.E. and Thody, R. (2009), "Composite action in CFT components and connections", Eng. J., AISC, 47(4), 229-242.
  20. Shim, C.S., Chung, C.H. and Kim, H.H. (2008a), "Experimental evaluation of seismic performance of precast segmental bridge piers with a circular solid section", Eng. Struct., 30(12), 3782-3792. https://doi.org/10.1016/j.engstruct.2008.07.005
  21. Shim, C.S., Chung, Y.S. and Han, J.H. (2008b), "Cyclic response of concrete-encased composite columns with low steel ratio", Struct. Build., 161(2), 77-89. https://doi.org/10.1680/stbu.2008.161.2.77
  22. Shim, C.S., Chung, Y.S. and Yoon, J.Y. (2011), "Cyclic behavior of prefabricated circular composite columns with low steel ratio", Eng. Struct., 33(9), 2525-2534. https://doi.org/10.1016/j.engstruct.2011.04.024
  23. Shim, C., Kim, D., Jung, D., Kim, I. and Chung, C. (2014), "Cyclic tests of modular CFT bridge piers", Proceedings of 10th U.S. National Conference on Earthquake Engineering Frontiers of Earthquake Engineering, Anchorage, AK, USA, July, pp. 1-10.
  24. Stefan, W. (2012), "Behaviour and design of generic buckling restrained brace systems", M.S. Thesis; Department of Civil and Environmental Engineering, The University of Auckland, Auckland, New Zealand.
  25. Watanabe, A., Hitomoi, Y., Saeki, E., Wada, A. and Fujimoto, M. (1988), "Properties of braces encased in buckling-restraining concrete and steel tube", Proceedings of the 10th World Conference on Earthquake Engineering, Tokyo-Kyoto, Japan, August.

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