Structural Engineering and Mechanics

  • 제75권6호
  • /
  • Pages.643-657
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  • 2020
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
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Test and simulation of circular steel tube confined concrete (STCC) columns made of plain UHPC

  • Le, Phong T. (Thuyloi University) ;
  • Le, An H. (NTT Hi-Tech Institute, Nguyen Tat Thanh University) ;
  • Binglin, Lai (Department of Civil and Environmental Engineering, National University of Singapore)
  • 투고 : 2019.10.02
  • 심사 : 2020.07.21
  • 발행 : 2020.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

This study presents experimental and numerical investigations on circular steel tube confined ultra high performance concrete (UHPC) columns under axial compression. The plain UHPC without fibers was designed to achieve a compressive strength ranged between 150 MPa and 200 MPa. Test results revealed that loading on only the UHPC core can generate a significant confinement effect for the UHPC core, thus leading to an increase in both strength and ductility of columns, and restricting the inherent brittleness of unconfined UHPC. All tested columns failed by shear plane failure of the UHPC core, this causes a softening stage in the axial load versus axial strain curves. In addition, an increase in the steel tube thickness or the confinement index was found to increase the strength and ductility enhancement and to reduce the magnitude of the loss of load capacity. Besides, steel tube with higher yield strength can improve the post-peak behavior. Based on the test results, the load contribution of the steel tube and the concrete core to the total load was examined. It was found that no significant confinement effect can be developed before the peak load, while the ductility of post-peak stage is mainly affected by the degree of the confinement effect. A finite element model (FEM) was also constructed in ABAQUS software to validate the test results. The effect of bond strength between the steel tube and the UHPC core was also investigated through the change of friction coefficient in FEM. Furthermore, the mechanism of circular steel tube confined UHPC columns was examined using the established FEM. Based on the results of FEM, the confining pressures along the height of each modeled column were shown. Furthermore, the interaction between the steel tube and the UHPC core was displayed through the slip length and shear stresses between two surfaces of two materials.

키워드

참고문헌

  1. Abbas, Y.R. (2017), "Nonlinear Finite Element Analysis to the Circular CFST Stub Columns", Procedia Eng., 173, 1692-1699. https://doi.org/10.1016/j.proeng.2016.12.197.
  2. Al-Ani, Y.R. (2016), "Finite element study to address the axial capacity of the circular concrete-filled steel tubular stub columns", Thin-Walled Struct., 126, 2-15. https://doi.org/10.1016/j.tws.2017.06.005.
  3. An, L.H. and Fehling E.(2017f), "Numerical study of circular steel tube confined concrete (STCC) stub columns with various concrete strengths", J. Construct. Steel Res., 136, 238-255. https://doi.org/10.1016/j.jcsr.2017.05.020.
  4. An, L.H. and Fehling, E. (2017a), "A review and analysis of UHPC filled steel tube columns", Struct. Eng. Mech., 61(2), 417-430. https://doi.org/10.12989/sem.2017.62.4.417.
  5. An, L.H. and Fehling, E. (2017b), "Analysis of circular steel tube confined UHPC stub columns", Steel Compos. Struct., 23(6), 669-682. https://doi.org/10.12989/scs.2017.23.6.669.
  6. An, L.H. and Fehling, E. (2017c), "Assessment of axial stress-strain model for UHPC confined by circular steel tube stub columns", Struct. Eng. Mech., 63(3), 371-384. https://doi.org/10.12989/sem.2017.63.3.371.
  7. An, L.H. and Fehling, E. (2017d), "Influence of steel fiber content and type on the uniaxial tensile and compressive behavior of UHPC", Construct. Build. Mater., 153, 790-806. https://doi.org/10.1016/j.conbuildmat.2017.07.130
  8. An, L.H. and Fehling, E. (2017e), "Numerical analysis of steel tube confined UHPC stubs columns", Comput. Concrete, 19(3), 263-273. https://doi.org/10.12989/cac.2017.19.3.263.
  9. Architectural Institute of Japan (AIJ) (2001), Recommendation for Design and Construction of Concrete Filled Steel Tubular Structures, AIJ, Japan.
  10. Aslani, F., Uy, B., Tao, Z. and Mashiri, F. (2015), "Predicting the axial load capacity of high-strength concrete filled steel tubular columns", Steel Compos. Struct., 19(4), 967-993. https://doi.org/10.12989/scs.2015.19.4.967.
  11. Attard, M.M. and Setunge, S. (1996), "Stress-Strain Relationship of Confined and Unconfined Concrete", Mater. J., 93, 432-442.
  12. Binici, B. (2005), "An analytical model for stress-strain behavior of confined concrete", Eng. Struct., 27, 1040-1051. https://doi.org/10.1016/j.engstruct.2005.03.002.
  13. De Oliveira, W.L.A., De Nardin, S., De Cresce El Debs, A.L.H. and El Debs, M.K. (2010), "Evaluation of passive confinement in CFT columns", J. Construct. Steel Res., 66(4), 487-495. https://doi.org/10.1016/j.jcsr.2009.11.004.
  14. DIN 1048-5:1991-06, Prufverfahren fur Beton, Teil 5: Festbeton, gesondert hergestellte Probekorper, Normenausschuss fur Bauwesen (NABau) im DIN Deutsches Institut fur Norming e.V., Beuth Verlag GmBH, Berlin, Germany.
  15. DIN EN 12350-8:2010-12, Testing fresh concrete - Part 8: self-compacting concrete-slump-flow test, German version EN 12350-8, 2010, Beuth Verlag, Berlin.
  16. DIN EN 12390-3:2009-7, Testing hardened concrete-Part 3: Compressive strength of test specimens, German version EN 12390-3:2009, Beuth Verlag, Berlin.
  17. Ding, F.X., Tan, L., Liu, X.M. and Wang, L. (2017), "Behavior of circular thin-walled steel tube confined concrete stub columns", Steel Compos. Struct., 23(2), 229-238. https://doi.org/10.12989/scs.2017.23.2.229.
  18. Empelmann, M., Teutsch, M. and Steven, G. (2004), "Improvement of the post fracture behaviour of UHPC by fibres", Proceeding of 2nd International Symposium on Ultra High Performance Concrete, Kassel, March.
  19. Empelmann, M., Teutsch, M. and Steven, G. (2008), "Load-bearing behaviour of centrically loaded UHPFRC-columns", Proceeding of Second International Symposium on Ultra High Performance Concrete, Kassel, March.
  20. European standard EN 10002-1 (2001), Metallic material - Tensile testing - Part 1: Method of test at ambient temperature, Brussels, Belgium.
  21. Graybeal B.A. (2005), "Characterization of the behavior of ultra-high performance concrete", Ph.D. Dissertation, University of Maryland, USA.
  22. Gupta, P.K. and Singh, H. (2014), "Numerical study of confinement in short concrete filled steel tube columns", Latin American J. Solids Struct., 11, 1445-1462. http://dx.doi.org/10.1590/S1679-78252014000800010.
  23. Giakoumelis, G. and Lam, D. (2004), "Axial capacity of circular concrete-filled tube columns", J. Construct. Steel Res., 60(7), 1049-1068. https://doi.org/10.1016/j.jcsr.2003.10.001.
  24. Haghinejad, A. and Nematzadeh M. (2016), "Three-dimensional finite element analysis of compressive behavior of circular steel tube-confined concrete stub columns by new confinement relationships", Latin American J. Solids Struct., 13, 916-944. http://dx.doi.org/10.1590/1679-78252631.
  25. Han L., Yao, G.H., Chen, Z.P. and Yu, Q. (2005), "Experimental behavior of steel tube confined concrete (STCC) columns", Steel Compos. Struct., 5(6), 459-84. https://doi.org/10.12989/scs.2005.5.6.459
  26. Han, L.H.; Liu, W. and Yang, Y.F. (2008), "Behavior of thin walled steel tube confined concrete stub columns subjected to axial local compression", Thin-Walled Struct., 46, 155-164. https://doi.org/10.1016/j.tws.2007.08.029.
  27. Johansson, M. (2002), "Composite action and confinement effects in tubular steel-concrete columns", Ph.D. Dissertation, Department of Structural Engineering, Concrete Structures, Chalmers University of Technology, Goteborg, Sweden.
  28. Johansson, M. and Gylltoft, K. (2002), "Mechanical behavior of circular steel-concrete composite stub columns", J. Struct. Eng., 128(8), 1073-1081. https://doi.org/10.1061/(ASCE)0733-9445(2002)128:8(1073).
  29. Liew, J.Y.R. and Xiong, D.X. (2012), "Ultra-high strength concrete filled composite columns for multi-storey building construction", Adv. Struct. Eng., 15(9), 1487-1503. https://doi.org/10.1260/1369-4332.15.9.1487.
  30. Liu, J., Zhang, S., Zhang, X. and Guo, L. (2009), "Behavior and strength of circular tube confined reinforced-concrete (CTRC) columns", J. Construct. Steel Res., 65, 1447-1458. https://doi.org/10.1016/j.jcsr.2009.03.014.
  31. Liu, J., Zhou, X. and Gan, D. (2016), "Effect of friction on axially loaded stub circular tubed columns", Adv. Struct. Eng., 19(3), 546-559. https://doi.org/10.1177/1369433216630125.
  32. Papanikolaou, V.K. and Kappos, A.J. (2007), "Confinement-sensitive plasticity constitutive model for concrete in triaxial compression" Int. J. Solids Struct, 44, 7021-7048. https://doi.org/10.1016/j.ijsolstr.2007.03.022.
  33. Shin, H.O., Soon, Y.S., Cook, W.D. and Michell, D. (2015), "Effect of confinement on the axial load response of ultrahigh-strength concrete columns", J. Struct. Eng., 141(6): 04014151-1:04014151-12. https://doi.org/10.1061/(ASCE)ST.1943541X.0001106.
  34. Tao, Z., Wang, Z.B. and Yu, Q. (2013), "Finite element modelling of concrete-filled steel stub columns under axial compression". J. Constr. Steel Res. 89, 121-131. https://doi.org/10.1016/j.jcsr.2013.07.001.
  35. Tasdemir, M.A., Tasdemir, C., Akyuz, S., Jefferson, A.D., Lydon, F.D. and Barr, B.I.G. (1998), "Evaluation of strains at peak stresses in concrete: A three-phase composite model approach", Cem. Concr. Compos. 20, 301-318. https://doi.org/10.1016/S0958-9465(98)00012-2.
  36. Tue, N.V., Kuchler, M., Schenck, G. and Jurgen, R. (2004b), "Application of UHPC filled tubes in buildings and bridges" Proceeding of International Symposium on Ultra High Performance Concrete, Kassel, Germany, March.
  37. Tue, N.V., Schneider, H., Simsch, G. and Schmidt, D. (2004a), "Bearing capacity of stub columns made of NSC, HSC and UHPC confined by a steel tube", Proceeding of First International Symposium on Ultra High Performance Concrete, Kassel, Germany, March.
  38. Xiong, M.X., Xiong, D.X. and Liew, J.Y.R. (2017), "Axial performance of short concrete filled steel tubes with high-and ultra-high-strength materials", Eng. Struct., 136, 494-510. https://doi.org/10.1016/j.engstruct.2017.01.037.
  39. Yan, P.Y. and Feng, J.W. (2008), "Mechanical behavior of UHPC and UHPC filled steel tubular stub columns", Proceeding of Second International Symposium on Ultra High Performance Concrete, Kassel, Germany, March.
  40. Yang, X., Zohrevand, P. and Mirmiran, A. (2015), "Behavior of ultrahigh-performance concrete confined by steel", J. Mater. Civil Eng. ASCE, 28(10), 04016113-1: 04016113-8. https://doi.org/10.1061/(ASCE)MT.19435533.0001623
  41. Yu, Q., Tao, Z., Liu, W. and Chen, Z.B. (2010), "Analysis and calculations of steel tube confined concrete (STCC) stub columns", J. Construct. Steel Res., 66(1), 53-64. https://doi.org/10.1016/j.jcsr.2009.08.003.
  42. Yu, T., Teng, J.G., Wong, Y.L. and Dong, S.L. (2010), "Finite element modeling of confined concrete-I: Drucker-Prager type plasticity model", Eng. Struct., 32, 665-679. https://doi.org/10.1016/j.engstruct.2009.11.014
  43. Zhang, S., Guo, L., Ye, Z. and Wang, Y. (2005), "Behavior of steel tube and confined high strength concrete for concrete-filled RHS tubes", Adv. Struct. Eng., 8(2), 101-116. https://doi.org/10.1260/1369433054037976.
  44. Zohrevand, P. and Mirmiran, A. (2011), "Behavior of ultrahigh-performance concrete confined by fiber reinforced polymers", J. Mater. Civil Eng. ASCE, 23(12), 1727-1734. https://doi.org/10.1061/(ASCE)MT.19435533.0000324