Experimental and Numerical Investigation on the Cyclic Behavior of SRC Columns considering Unsymmetrical Confinement Effect

다국어 초록 (Multilingual Abstract)

Experimental and numerical studies were conducted on the cyclic behavior of steel reinforced concrete (SRC) columns with T-shaped and L-shaped steel section. A total of 8 SRC columns were tested under axial compression and lateral cyclic loading. The design details, loading procedure and main results, including the failure modes, hysteretic characteristics and ductility were reported. Four failure modes as flexural failure, shear bond failure, shear compression failure and shear compound failure were observed. By considering various unsymmetrical confinement and plastic hinge region, the experimental study was supplemented by numerical analysis to study the influence of axial compression ratio, shear-span ratio and concrete strength. The results revealed that the FEA is in good agreement with the experimental results. The ultimate loading of specimen with confinement effect has been improved by 21.4% − 33.8%. The failure modes is dominated by the shear-span ratio and type of cross section. The specimens with smaller shear-span ratio are prone to shear failure, while the unsymmetrical steel arrangement causes shear compound failure which is combined with shear bond failure and shear compression failure. Moreover, the specimens with larger shear-span ratio and stirrup ratio present greater deformation capacity and ductility. In practical engineering, the confinement degree of SRC columns with unsymmetrical steel section can be enhanced by increasing the stirrup ratio and arranging the cross ties.

참고문헌 (Reference)

1 Mander JB, "Theoretical stress-strain model or for confined concrete" 114 : 1988

2 Zhao XZ, "Theoretical stress-strain model for concrete in steel-reinforced concrete columns" 145 (145): 04019009-, 2019

3 Xu CX, "Study on seismic behavior of encased steel jacket-strengthened earthquake-damaged composite steel-concrete columns" 17 : 154-166, 2018

4 Xie YP, "Study on plastic hinge length and limit curvature of RC column" 351-352 : 378-381, 2013

5 Saatcioglu M, "Strength and ductility of confined concrete" 118 (118): 1590-1607, 1992

6 Yang Y, "Static behavior of T-shaped concrete-filled steel tubular columns subjected to concentric and eccentric compressive loads" 95 : 374-388, 2015

7 Ricles JM, "Seismic performance of steel-encased composite columns" 120 (120): 2474-2494, 1994

8 Zeng L, "Seismic damage evaluation of concrete-encased steel frame-reinforced concrete core tube buildings based on dynamic characteristics" 7 (7): 314-, 2017

9 Zhang YF, "Seismic behavior of ring beam joints between concrete-filled twin steel tubes columns and reinforced concrete beams" 39 : 1-10, 2012

10 Fang L, "Seismic behavior of concrete-encased steel cross-shaped columns" 109 : 24-33, 2015

11 Ji X, "Seismic behavior and strength capacity of steel tube-reinforced concrete composite columns" 43 (43): 487-505, 2014

12 Ji X, "Seismic behavior and modeling of steel reinforced concrete(SRC)walls" 44 (44): 955-972, 2015

13 Chen CC, "Role of concrete confinement of wide-flange structural steel shape in steel reinforced concrete columns under cyclic loading" 110 : 79-87, 2016

14 Ricles JM, "Posttensioned seismic-resistant connections for steel frames" 127 (127): 113-121, 2001

15 Ellobody E, "Numerical simulation of concrete encased steel composite columns" 67 (67): 211-222, 2011

16 Zhao J, "Modeling of strain penetration effects in fiber-based analysis of reinforced concrete structures" 104 (104): 133-141, 2007

17 "Metallic materials - Tensile testing at ambient temperature. GB/T228-2002"

18 Chiu L, "Finite element modelling of composite structures under crushing load" 131 : 215-228, 2015

19 Yu T, "Finite element modeling of confined concrete-II : Plastic-damage model" 32 (32): 680-691, 2010

20 Xiang S, "Experimental study on the dynamic behavior of T-shaped steel reinforced concrete columns under impact loading" 208 : 110307-, 2020

21 Yuan W, "Experimental study on seismic behavior of concrete walls reinforced by PC strands" 175 : 577-590, 2018

22 Lehman D, "Experimental evaluation of the seismic performance of reinforced concrete bridge columns" 130 (130): 869-879, 2004

23 Yunfeng Xiao ; Lei Zeng ; Zhenkun Cui ; Siqian Jin ; Yiguang Chen, "Experimental and analytical performance evaluation of steel beam to concrete-encased composite column with unsymmetrical steel section joints" 국제구조공학회 23 (23): 17-29, 2017

24 Ghannoum WM, "Dynamic collapse analysis of a concrete frame sustaining column axial failures" 109 (109): 403-412, 2012

25 Park R, "Ductility of square-confined concretecolumns" 108 (108): 929-950, 1982

26 Martínez-Rueda JE, "Confined concrete model under cyclic load" 30 (30): 139-147, 1997

27 Yu T, "Compressive behavior of frp-confined concrete-encased steel columns" 154 : 493-506, 2016

28 Rashid Hameed ; Anaclet Turatsinze ; Frédéric Duprat ; Alain Sellier, "Bond stress-slip Behaviour of Steel Reinforcing Bar Embedded in Hybrid Fiber-reinforced Concrete" 대한토목학회 17 (17): 1700-1707, 2013

29 Harajli MH, "Bond behavior in steel fiber-reinforced concrete zones under static and cyclic loading : Experimental evaluations and analytical modeling" 22 (22): 674-686, 2010

30 Dundar C, "Behaviour of reinforced and concrete-encased composite columns subjected to biaxial bending and axial load" 43 (43): 1109-1120, 2008

31 Gautham A, "Behavior of steel-reinforced composite concrete columns under combined axial and lateral cyclic loading" 39 (39): 102305-, 2021

32 Pedro RM, "Behavior of biaxially loaded concrete-encased composite columns" 123 (123): 1997

33 Liang CY, "Axial compressive behavior of square composite columns confined by multiple spirals" 103 : 230-240, 2014

34 Chen CC, "Analytical model for predicting axial capacity and behavior of concrete encased steel composite stub columns" 62 (62): 424-433, 2006

35 Lee TK, "Analysis of composite beam-columns under lateral cyclic loading" 127 (127): 186-193, 2001

36 Callejo A, "Adjoint method for the sensitivity analysis of composite beam cross-sections" 213 : 100-111, 2019

37 Xiang S, "A DIC-based study on compressive responses of concrete after exposure to elevated temperatures" 12 (12): 2044-, 2019