Steel and Composite Structures

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Seismic behavior of steel truss reinforced concrete L-shaped columns under combined loading

  • Ning, Fan (College of Civil Engineering and Architecture, Guangxi University) ;
  • Chen, Zongping (College of Civil Engineering and Architecture, Guangxi University) ;
  • Zhou, Ji (College of Civil Engineering and Architecture, Guangxi University) ;
  • Xu, Dingyi (College of Civil Engineering and Architecture, Guangxi University)
  • Received : 2020.10.07
  • Accepted : 2022.04.11
  • Published : 2022.04.25
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Abstract

Steel-reinforced concrete (SRC) L-shaped column is the vertical load-bearing member with high spatial adaptability. The seismic behavior of SRC L-shaped column is complex because of their irregular cross sections. In this study, the hysteretic performance of six steel truss reinforced concrete L-shaped columns specimens under the combined loading of compression, bending, shear, and torsion was tested. There were two parameters, i.e., the moment ratio of torsion to bending (γ) and the aspect ratio (column length-to-depth ratio (φ)). The failure process, torsion-displacement hysteresis curves, and bending-displacement hysteresis curves of specimens were obtained, and the failure patterns, hysteresis curves, rigidity degradation, ductility, and energy dissipation were analyzed. The experimental research indicates that the failure mode of the specimen changes from bending failure to bending-shear failure and finally bending-torsion failure with the increase of γ. The torsion-displacement hysteresis curves were pinched in the middle, formed a slip platform, and the phenomenon of "load drop" occurred after the peak load. The bending-displacement hysteresis curves were plump, which shows that the bending capacity of the specimen is better than torsion capacity. The results show that the steel truss reinforced concrete L-shaped columns have good collapse resistance, and the ultimate interstory drift ratio more than that of the Chinese Code of Seismic Design of Building (GB50011-2014), which is sufficient. The average value of displacement ductility coefficient is larger than rotation angle ductility coefficient, indicating that the specimen has a better bending deformation resistance. The specimen that has a more regular section with a small φ has better potential to bear bending moment and torsion evenly and consume more energy under a combined action.

Keywords

Acknowledgement

The research reported herein was supported by the National Natural Science Foundation of China (N0.51268004 and 51578163), Guangxi Science and Technology Base and Talent Special Project (AD21075031), Bagui Scholar Program of Guangxi (No: [2019]79), Central Government Project for Guidance of Local Scientific and Technological Development (ZY21195010), Guangxi Key R&D Plan (AB21220012) and Innovation Project of Guangxi Graduate Education (YCBZ2021020). This financial support is gratefully acknowledged, and the authors would also like to thank all of the technicians at the Key Laboratory of Disaster Prevention and Structure Safety of Guangxi University for their assistance during the loading tests.

References

  1. B/T 50081-2019 (2019), Standard for Test Method of Concrete Physical and Mechanical Properties, China Architecture & Building Press, Beijing, China.
  2. BSL (1987), Building Standard Law of Japan, The Building Center of Japan, Tokyo, Japan.
  3. CEN Eurocode 8 (2004), Design of Structures for Earthquake Resistance-Part 1: General Rules, Seismic Actions and Rules for Buildings, European Committee for Standardization, Bruxelles, Belgium.
  4. Chen Z.P., Liu X. and Ning F. (2018), "Experimental study on seismic behavior of reinforced concrete cross shape columns under compression-flexure-shear-torsion combined actions", Eng. Mech., 35(10), 124-134. https://doi.org/10.6052/j.issn.1000-4750.2017.06.0506.
  5. Chen Z.P., Xu J.J. and Chen Y.L. (2016), "Axial compression ratio limit values for Steel Reinforced Concrete (SRC) special shaped columns", Steel Compos. Struct., 20(2), 295-316. https://doi.org/10.12989/scs.2016.20.2.295.
  6. Chen, Z.P. and Liu, X. (2018), "Seismic behavior of steel reinforced concrete cross-shaped column under combined torsion", Steel Compos. Struct., 16(4), 407-420. https://doi.org/10.12989/scs.2018.26.4.407.
  7. Chen, Z.P., Mo, L.L., Li, S.X., Liang, Y.H. and Xu, D.Y. (2021), "Seismic behavior of steel reinforced concrete L-shaped columns under compression-bending-shear-torsion combined action", J. Build. Eng., 42, 102498. https://doi.org/10.1016/J.JOBE.2021.102498.
  8. Chen, Z.P., Ning, F., Chen, J.J, Liu, X. and Xu, D.Y. (2021), "Test on mechanical behavior of SRC L-shaped columns under combined torsion and bending moment", Earthq. Eng. Eng. Vib., 20(1), 161-177. https://doi.org/10.1007/S11803-021-2012-0.
  9. Chen, Z.P., Xu, D.Y., Xu, J.J. and Wang, N. (2021), "Seismic behavior and strength of L-shaped steel reinforced concrete column-concrete beam planar and spatial joints", Steel Compos. Struct., 39(2), 337-352. https://doi.org/10.12989/scs.2021.39.3.337.
  10. Chen, Z.P., Xu, J.J. and Xue, J.Y. (2015), "Hysteretic behavior of special shaped columns composed of Steel and Reinforced Concrete (SRC)", Earthq. Eng. Eng. Vib., 14(2), 329-345. https://doi.org/10.1007/s11803-015-0026-1.
  11. Chu, L.S., Li, D.D., Xing, M. and Zhao, J. (2018), "Cyclic Behaviour of Concrete Encased Steel (CES) column-steel beam joints with concrete slabs", Steel Compos. Struct., 29(6), 735-748. https://doi.org/10.12989/scs.2018.29.6.735.
  12. Fang, L., Zhang, B. and Jin, G.F. (2015), "Seismic behavior of concrete-encased steel cross-shaped columns", J. Construct. Steel Res., 109, 24-33. https://doi.org/10.1016/j.jcsr.2015.03.001.
  13. GB/T228.1 (2010), Metallic Materials-Tensile Testing-Part 1 Method of Test at Room Temperature, China Standards Press, Beijing, China.
  14. GB50011-2014 (2014), Code for Seismic Design of Buildings, China Building Industry Press, Beijing, China.
  15. IBC (2009), International Building Code 2009, International Code Council, Inc, 12009.
  16. Joaquin, M. (1979), "Design aids for L-shaped reinforced concrete columns", ACI J., 76(11), 1197-1216. https://doi.org/10.1177/002199837901300406.
  17. Jurkowska, N. (2018), "Considering nonlinear properties of concrete in the design of reinforced concrete structures for torsion", Mater. Sci. Eng., 364(1), 1-9. https://doi.org/10.1088/1757-899X/364/1/012030.
  18. Li, H. (2011), The Seismic Action Comparison Between Chinese, American, European and Japanese Seismic Design Codes for Buildings, Harbin Institute of Technology, Harbin, China.
  19. Liu, H.L. (2020), "Research progress on torsion regularity of building structure under horizontal earthquake", J. Technol., 20(3), 264-269. https://doi.org/10.3969/j.issn.2096-3424.2020.03.011.
  20. Liu, X. (2019), Seismic Behavior of Cross-Shaped Column Subjected to Compression, Flexure, Shear and Torsion Loads, Ph.D. Dissertation, Guangxi University, Nanning.
  21. Liu, Z.Q., Du, Z.Y., Xue, J.J., Zhou, C.F. and Ren, R. (2019), "Experimental study and finite element analysis on seismic behavior of solid-web steel reinforced concrete cross-shaped and L-shaped columns", J. Build. Struct., 40(4), 104-115. https://doi.org/10.14006/j.jzjgxb.2019.04.011.
  22. Liu, Z.Q., Li, Y.T., Xue, J.J. and Zhou, C.F. (2020), "Experimental study and finite element analysis on seismic performance of steel reinforced concrete T-shaped columns loaded along flange", J. Build. Struct., 41(11), 29-40. https://doi.org/10.14006/j.jzjgxb.2019.0384.
  23. Liu, Z.Q., Zhou, C.F., Xue, J.J. and Leon Roberto, T. (2020), "Experimental study on seismic performance of steel reinforced concrete T-shaped columns", Steel Compos. Struct., 36(3), 339-353. https://doi.org/10.12989/scs.2020.36.3.339.
  24. Liu, Z.Q., Zhou, X., Xue, J.J., Zhou, C.F. and Zhao, L. (2020), "Influence of steel ratio on seismic performance of steel reinforced concrete special-shaped column", Eng. Mech., 37(6), 165-173. https://doi.org/10.6052/j.issn.1000-4750.2019.08.0454.
  25. Ramamurthy, L.N. and Khan, T.A.H. (1986), "Closure of l-shaped column design for biaxial eccentricity", J. Sruct. Eng., 112(10), 2360-2362. http://dx.doi.org/10.1061/(ASCE)0733-9445(1986)112:10(2360).
  26. Rong, X., Qiao, C.N., and Yang, C.H. (2018), "Seismic behavior test and finite element analysis of steel reinforced concrete cross-shaped columns", Earthq. Eng. Eng. Dyn., 38(2), 63-71. http://doi.org/10.13197/j.eeev.2018.02.63.rongx.008.
  27. Weng, X.H., Shao, Y.J. and Lao, Y.H. and Xia, M. (2017), "Experimental study on seismic behavior of steel reinforced concrete column under combined torsion", J. Build. Struct., 38(11), 23-33. http://doi.org/10.14006/j.jzjgxb.2017.11.003.
  28. Xiang, P., Lin, Y.P., Huang, W., Ding, F.X., Ye, B.L. and Deng, Z.H. (2020), "Investigation on shear capacity of joints between steel reinforced concrete special-shaped column and reinforced concrete beam", Front. Mater., 28, http://doi.org/10.3389/FMATS.2020.588296.
  29. Xu, D.Y. (2017), Damage Mechanism and Strength Calculation of Steel Reinforced Concrete L-shaped Column Subjected to Combined Compression, Flexure, Shear and Torsion Loads, Ph.D. Dissertation, Guangxi University, Nanning.
  30. Xue, J.Y., Zhou, C.F. and Liu, Z.Q. (2017), "Research on damage of solid-web steel reinforced concrete t-shaped columns subjected to various loadings", Steel Compos. Struct., 18(5), 701-713. http://doi.org/10.12989/scs.2017.24.4.409.
  31. Xue, J.Y., Zhou, C.F., Liu, Z.Q. and Du, Z.Y. (2020), "Research on damage behavior and quantitative indexes for steel reinforced concrete column with irregular section", China Civil Eng. J., 52(2), 1-11. http://doi.org/10.15951/j.tmgcxb.2020.02.001.
  32. Yuan, S.Q., Chen, S.C., Tian, Y. and Yan, W.M. (2018), "Experimental study and analysis of torsion-bending ratio effect on aseismic performance of SRC columns", Eng. Mech., 35(03), 167-177. http://doi.org/10.6052/j.issn.1000-4750.2016.11.0908.
  33. Zhou, T., Chen, Z. and Liu, H. (2012), "Seismic behavior of special shaped column composed of concrete filled steel tubes", J. Construct. Steel Res., 75(75), 131-141. http://doi.org/10.1016/j.jcsr.2012.03.015.
  34. Zuo, Z.L., Cai, J. and Yang, C. (2012), "Axial load behavior of l-shaped CFT stub columns with binding bars", Eng. Struct., 37, 88-98. http://doi.org/10.1016/j.engstruct.2011.12.042.