Seismic behavior of thin-walled circular and stiffened square steel tubed-reinforced-concrete columns
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摘要
Steel tubed-reinforced-concrete(TRC) columns have been gradually used in the construction of high-rise buildings recently because of their high axial load-carrying capacities and excellent seismic behavior. Existing studies about their seismic behavior were focused on columns with relatively thick tubes, i.e., diameter-to-thickness/width-to-thickness(D/t) ratios were below 100,while little is known about thin-walled TRC columns, especially for square TRC columns. Considering the infilled concrete of square TRC columns is non-uniformly and non-effectively confined, accordingly, stiffened square TRC columns are usually adopted in practice. Thus, two thin-walled circular TRC columns(D/t=120) and two stiffened square ones with diagonal stiffeners in plastic hinge regions(D/t=106) were tested under a constant axial compression combined with cyclic lateral loading.Both the circular and stiffened square TRC columns had the same cross sectional area, tube thickness, reinforcing bar ratio and column height. Flexural failure occurred for all the four specimens. Test results showed the strengths of the stiffened square TRC columns were a little higher in comparison to their circular counterparts; the ductility and energy dissipation capacities were excellent for both the stiffened and circular TRC columns, indicating very good confinement was gained from the yielded steel tubes of the plastic hinge regions at the peak loads. And shear stresses(35–90 MPa) in the sheared plates showed their moderate contribution of carrying lateral loads. Finally, cross sectional capacity analysis results demonstrated the method for TRC columns is acceptable for the stiffened square TRC columns.
Steel tubed-reinforced-concrete(TRC) columns have been gradually used in the construction of high-rise buildings recently because of their high axial load-carrying capacities and excellent seismic behavior. Existing studies about their seismic behavior were focused on columns with relatively thick tubes, i.e., diameter-to-thickness/width-to-thickness(D/t) ratios were below 100,while little is known about thin-walled TRC columns, especially for square TRC columns. Considering the infilled concrete of square TRC columns is non-uniformly and non-effectively confined, accordingly, stiffened square TRC columns are usually adopted in practice. Thus, two thin-walled circular TRC columns(D/t=120) and two stiffened square ones with diagonal stiffeners in plastic hinge regions(D/t=106) were tested under a constant axial compression combined with cyclic lateral loading.Both the circular and stiffened square TRC columns had the same cross sectional area, tube thickness, reinforcing bar ratio and column height. Flexural failure occurred for all the four specimens. Test results showed the strengths of the stiffened square TRC columns were a little higher in comparison to their circular counterparts; the ductility and energy dissipation capacities were excellent for both the stiffened and circular TRC columns, indicating very good confinement was gained from the yielded steel tubes of the plastic hinge regions at the peak loads. And shear stresses(35–90 MPa) in the sheared plates showed their moderate contribution of carrying lateral loads. Finally, cross sectional capacity analysis results demonstrated the method for TRC columns is acceptable for the stiffened square TRC columns.
Steel tubed-reinforced-concrete(TRC) columns have been gradually used in the construction of high-rise buildings recently because of their high axial load-carrying capacities and excellent seismic behavior. Existing studies about their seismic behavior were focused on columns with relatively thick tubes, i.e., diameter-to-thickness/width-to-thickness(D/t) ratios were below 100,while little is known about thin-walled TRC columns, especially for square TRC columns. Considering the infilled concrete of square TRC columns is non-uniformly and non-effectively confined, accordingly, stiffened square TRC columns are usually adopted in practice. Thus, two thin-walled circular TRC columns(D/t=120) and two stiffened square ones with diagonal stiffeners in plastic hinge regions(D/t=106) were tested under a constant axial compression combined with cyclic lateral loading.Both the circular and stiffened square TRC columns had the same cross sectional area, tube thickness, reinforcing bar ratio and column height. Flexural failure occurred for all the four specimens. Test results showed the strengths of the stiffened square TRC columns were a little higher in comparison to their circular counterparts; the ductility and energy dissipation capacities were excellent for both the stiffened and circular TRC columns, indicating very good confinement was gained from the yielded steel tubes of the plastic hinge regions at the peak loads. And shear stresses(35–90 MPa) in the sheared plates showed their moderate contribution of carrying lateral loads. Finally, cross sectional capacity analysis results demonstrated the method for TRC columns is acceptable for the stiffened square TRC columns.
引文
1 Fukuhara T,Sun Y P.Earthquake-resisting properties of confined high-strength concrete frames.In:14th World Conference on Earthquake Engineering.Beijing,2008.1-8
2 Gan D,Zhou Z,Yan F,et al.Shear transfer capacity of composite sections in steel tubed-reinforced-concrete frames.Structures,2017,12:54-63
3 Priestley M J N,Seible F,Xiao Y,et al.Steel jacket retrofitting of reinforced concrete bridge columns for enhanced shear strength-Part2:Test results and comparison with theory.ACI Struct J,1994,91:537-551
4 Chen Q J,Cai J,Bradford M A,et al.Seismic behaviour of a throughbeam connection between concrete-filled steel tubular columns and reinforced concrete beams.Eng Struct,2014,80:24-39
5 Zhou X,Cheng G,Liu J,et al.Behavior of circular tubed-RC column to RC beam connections under axial compression.J Constr Steel Res,2017,130:96-108
6 Hiroyuki Y,Hiroshi H,Kishimoto H,Hideyuki K.Construction of a large-scale super high-rise apartment building with ultra-high strength concrete column confined by steel plate(Fc=130 N/mm2)(in Japanese).Concrete Eng,2006,44:51-57
7 Han L H,Yao G H,Chen Z B,et al.Experimental behaviours of steel tube confined concrete(STCC)columns.Steel Compos Struct,2005,5:459-484
8 Zhou X,Liu J.Seismic behavior and shear strength of tubed RC short columns.J Constr Steel Res,2010,66:385-397
9 Aboutaha R S,Machado R I.Seismic resistance of steel-tubed highstrength reinforced-concrete columns.J Struct Eng,1999,125:485-494
10 Sun Y,Sakino K,Yasuda K,et al.Earthquake-resisting performance of R/C columns confined by square steel tubes:Part 3.Effects of shear span ratio of column(in Japanese).Trans AIJ,2001,66:129-136
11 Xiao Y,Wu H.Retrofit of reinforced concrete columns using partially stiffened steel jackets.J Struct Eng,2003,129:725-732
12 Liu J,Ali Abdullah J,Zhang S.Hysteretic behavior and design of square tubed reinforced and steel reinforced concrete(STRC and/or STSRC)short columns.Thin-Walled Struct,2011,49:874-888
13 Ding F,Lu D,Bai Y,et al.Comparative study of square stirrupconfined concrete-filled steel tubular stub columns under axial loading.Thin-Walled Struct,2016,98:443-453
14 Wang Y T,Cai J,Long Y L.Hysteretic behavior of square CFTcolumns with binding bars.J Constr Steel Res,2017,131:162-175
15 Ding F,Luo L,Wang L,et al.Pseudo-static tests of terminal stirrupconfined concrete-filled rectangular steel tubular columns.J Constr Steel Res,2018,144:135-152
16 Park R.State of the art report ductility evaluation from laboratory and analytical testing.In:9th World Conference on Earthquake Engineering.Tokyo-Kyoto,1988.605-616
17 CEN.EuroCode 8:Design Provisions for Earthquake Resistance-Part1:General Rules,Seismic Actions and Rules for Buildings.EN 1998-1:2004.Brussels:European Committee for Standardization,2004
18 China Construction Science Research Institute.Code for Seismic Design of Buildings(in Chinese).GB50011-2010.Beijing:China Building Industry Press,2010
19 Zhang S,Guo L,Ye Z,et al.Behavior of steel tube and confined high strength concrete for concrete-filled RHS tubes.Adv Struct Eng,2005,8:101-116
20 Liu J,Gan D,Zhou X,et al.Cyclic shear behavior and shear strength of steel tubed-reinforced-concrete short columns.Adv Struct Eng,2018,21:1749-1760
21 Gan D,Guo L,Liu J,et al.Seismic behavior and moment strength of tubed steel reinforced-concrete(SRC)beam-columns.J Constr Steel Res,2011,67:1516-1524
22 Wang X,Liu J,Zhang S.Behavior of short circular tubed-reinforcedconcrete columns subjected to eccentric compression.Eng Struct,2015,105:77-86
23 Liu J,Wang X,Zhang S.Behavior of square tubed reinforced-concrete short columns subjected to eccentric compression.Thin-Walled Struct,2015,91:108-115
2 Gan D,Zhou Z,Yan F,et al.Shear transfer capacity of composite sections in steel tubed-reinforced-concrete frames.Structures,2017,12:54-63
3 Priestley M J N,Seible F,Xiao Y,et al.Steel jacket retrofitting of reinforced concrete bridge columns for enhanced shear strength-Part2:Test results and comparison with theory.ACI Struct J,1994,91:537-551
4 Chen Q J,Cai J,Bradford M A,et al.Seismic behaviour of a throughbeam connection between concrete-filled steel tubular columns and reinforced concrete beams.Eng Struct,2014,80:24-39
5 Zhou X,Cheng G,Liu J,et al.Behavior of circular tubed-RC column to RC beam connections under axial compression.J Constr Steel Res,2017,130:96-108
6 Hiroyuki Y,Hiroshi H,Kishimoto H,Hideyuki K.Construction of a large-scale super high-rise apartment building with ultra-high strength concrete column confined by steel plate(Fc=130 N/mm2)(in Japanese).Concrete Eng,2006,44:51-57
7 Han L H,Yao G H,Chen Z B,et al.Experimental behaviours of steel tube confined concrete(STCC)columns.Steel Compos Struct,2005,5:459-484
8 Zhou X,Liu J.Seismic behavior and shear strength of tubed RC short columns.J Constr Steel Res,2010,66:385-397
9 Aboutaha R S,Machado R I.Seismic resistance of steel-tubed highstrength reinforced-concrete columns.J Struct Eng,1999,125:485-494
10 Sun Y,Sakino K,Yasuda K,et al.Earthquake-resisting performance of R/C columns confined by square steel tubes:Part 3.Effects of shear span ratio of column(in Japanese).Trans AIJ,2001,66:129-136
11 Xiao Y,Wu H.Retrofit of reinforced concrete columns using partially stiffened steel jackets.J Struct Eng,2003,129:725-732
12 Liu J,Ali Abdullah J,Zhang S.Hysteretic behavior and design of square tubed reinforced and steel reinforced concrete(STRC and/or STSRC)short columns.Thin-Walled Struct,2011,49:874-888
13 Ding F,Lu D,Bai Y,et al.Comparative study of square stirrupconfined concrete-filled steel tubular stub columns under axial loading.Thin-Walled Struct,2016,98:443-453
14 Wang Y T,Cai J,Long Y L.Hysteretic behavior of square CFTcolumns with binding bars.J Constr Steel Res,2017,131:162-175
15 Ding F,Luo L,Wang L,et al.Pseudo-static tests of terminal stirrupconfined concrete-filled rectangular steel tubular columns.J Constr Steel Res,2018,144:135-152
16 Park R.State of the art report ductility evaluation from laboratory and analytical testing.In:9th World Conference on Earthquake Engineering.Tokyo-Kyoto,1988.605-616
17 CEN.EuroCode 8:Design Provisions for Earthquake Resistance-Part1:General Rules,Seismic Actions and Rules for Buildings.EN 1998-1:2004.Brussels:European Committee for Standardization,2004
18 China Construction Science Research Institute.Code for Seismic Design of Buildings(in Chinese).GB50011-2010.Beijing:China Building Industry Press,2010
19 Zhang S,Guo L,Ye Z,et al.Behavior of steel tube and confined high strength concrete for concrete-filled RHS tubes.Adv Struct Eng,2005,8:101-116
20 Liu J,Gan D,Zhou X,et al.Cyclic shear behavior and shear strength of steel tubed-reinforced-concrete short columns.Adv Struct Eng,2018,21:1749-1760
21 Gan D,Guo L,Liu J,et al.Seismic behavior and moment strength of tubed steel reinforced-concrete(SRC)beam-columns.J Constr Steel Res,2011,67:1516-1524
22 Wang X,Liu J,Zhang S.Behavior of short circular tubed-reinforcedconcrete columns subjected to eccentric compression.Eng Struct,2015,105:77-86
23 Liu J,Wang X,Zhang S.Behavior of square tubed reinforced-concrete short columns subjected to eccentric compression.Thin-Walled Struct,2015,91:108-115