离心预制高强混凝土管柱受剪性能试验研究
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摘要
为研究离心预制高强混凝土管柱的受剪性能,完成了8个试件的单向加载试验,分析了轴压比、剪跨比和体积配箍率对各试件破坏形态、受剪承载力和变形性能的影响.试验结果表明:所有试件的破坏形态均为剪压破坏,剪切斜裂缝与柱纵轴夹角在29°～41°之间;轴压比和剪跨比是影响离心预制高强混凝土管柱受剪性能的关键参数,对其受剪承载力和变形性能影响较大;剪切变形对柱顶总位移贡献的比例随剪跨比的减少而显著增加,剪切变形对小剪跨比柱受剪性能的影响更显著;峰值荷载时,剪跨区中部约1/2柱高范围内箍筋进入屈服,箍筋平均应力可达到抗拉强度的65%～80%;基于桁架-拱模型理论,建立了离心预制高强混凝土管柱的受剪承载力计算式,计算值与试验结果吻合较好且偏于安全.
To investigate the shear behavior of centrifugal precast high-strength concrete tubular columns,in this study,we conducted monotonic loading tests on eight specimens and analyzed the effects of the axial compression ratio,shear span ratio,and volumetric stirrup ratio on the failure mode,shear capacity,and deformation performance of each specimen.The test results indicate that the failure modes of all specimens are shear-compression failure,and the angle between the inclined cracks and the longitudinal axial of the columns ranged from 29° to41°.The axial-compression and shear-span ratios are critical parameters that affect the shear behavior of centrifugal precast high-strength concrete tubular columns,and they have a noticeable effect on the shear capacity and deformation performance.The contribution of shear deformation to the total displacement increases significantly with a decrease in the shear span ratio.Shear deformation has a more noticeable effect on the shear behavior of columns with a small shear span ratio.At peak load,we found stirrups in the range of about one half the column height in the middle of the shear span region to yield,and the average stress experienced by the stirrups was observed to reach 65% to80% of the tensile strength.Based on the truss-arch model theory,we propose a shear capacity formula for centrifugal precast high-strength concrete tubular columns.The calculated results are conservative and agree well with the test results.
To investigate the shear behavior of centrifugal precast high-strength concrete tubular columns,in this study,we conducted monotonic loading tests on eight specimens and analyzed the effects of the axial compression ratio,shear span ratio,and volumetric stirrup ratio on the failure mode,shear capacity,and deformation performance of each specimen.The test results indicate that the failure modes of all specimens are shear-compression failure,and the angle between the inclined cracks and the longitudinal axial of the columns ranged from 29° to41°.The axial-compression and shear-span ratios are critical parameters that affect the shear behavior of centrifugal precast high-strength concrete tubular columns,and they have a noticeable effect on the shear capacity and deformation performance.The contribution of shear deformation to the total displacement increases significantly with a decrease in the shear span ratio.Shear deformation has a more noticeable effect on the shear behavior of columns with a small shear span ratio.At peak load,we found stirrups in the range of about one half the column height in the middle of the shear span region to yield,and the average stress experienced by the stirrups was observed to reach 65% to80% of the tensile strength.Based on the truss-arch model theory,we propose a shear capacity formula for centrifugal precast high-strength concrete tubular columns.The calculated results are conservative and agree well with the test results.
引文
[1]张锡治,马健,蔡魏巍,等.变预应力度装配式管柱抗震性能试验[J].天津大学学报:自然科学与工程技术版,2016,49(10):1041-1048.Zhang Xizhi,Ma Jian,Cai Weiwei,et al.Experiment on seismic behavior of prefabricated pipe column with various levels of prestress[J].Journal of Tianjin University:Science and Technology,2016,49(10):1041-1048(in Chinese).
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[3]Seo S Y,Yoon S J,Lee W J.Evaluation of structural performance the hollow PC column joint subjected to cyclic lateral load[J].Journal of the Korea Concrete Institute,2008,20(3):335-343.
[4]Yeh Y K,Mo Y L,Yang C Y.Seismic performance of rectangular hollow bridge columns[J].Journal of Structural Engineering,2002,128(1):60-68.
[5]Yeh Y K,Mo Y L,Yang C Y.Full-scale tests on rectangular hollow bridge piers[J].Material and Structures,2002,35(2):117-125.
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[7]Delgado R,Delgado P,Pouca N V,et al.Shear effects on hollow section piers under seismic actions:Experimental and numerical analysis[J].Bulletin of Earthquake Engineering,2009,7(2):377-389.
[8]Shin M,Choi Y Y,Sun C H,et al.Shear strength model for reinforced concrete rectangular hollow columns[J].Engineering Structures,2013,56(2):958-969.
[9]Kim I H,Sun C H,Shin M.Concrete contribution to initial shear strength of RC hollow columns[J].Structural Engineering and Mechanics,2012,41(1):43-65.
[10]张锡治,蔡魏巍,张潮,等.变轴压比预制高强混凝土混合配筋管柱抗震性能研究[J].天津大学学报:自然科学与工程技术版,2017,50(2):167-173.Zhang Xizhi,Cai Weiwei,Zhang Chao,et al.Seismic behavior of prefabricated high strength concrete pipe column with mixed reinforcement under various axialcompression ratio[J].Journal of Tianjin University:Science and Technology,2017,50(2):167-173(in Chinese).
[11]GB/T 228.1-2010金属材料拉伸试验第1部分:室温试验方法[S].北京:中国标准出版社,2010.GB/T 228.1-2010 Metallic Materials-Tensile TestingPart 1:Method of Test at Room Temperature[S].Beijing:Standards Press of China,2010(in Chinese).
[12]GB/T 50152-2012混凝土结构试验方法标准[S].北京:中国建筑工业出版社,2012.GB/T 50152-2012 Standard for Test Method of Concrete Structures[S].Beijing:China Architecture&Building Press,2012(in Chinese).
[13]Park R.Evaluation of ductility of structures and structural assemblages from laboratory testing[J].Bulletin of the New Zealand National Society for Earthquake Engineering,1989,22(3):155-166.
[14]赵国藩.高等钢筋混凝土结构学[M].北京:机械工业出版社,2008.Zhao Guofan.Advanced Reinforced Concrete Structures[M].Beijing:China Machine Press,2008(in Chinese).
[15]Priestley M J N,Verma R,Xiao Y.Seismic shear strength of reinforced concrete columns[J].Journal of Structural Engineering,1994,120(8):2310-2329.
[2]张锡治,章少华,牛四欣.装配式建筑中预制混凝土管柱的研究与展望[J].建筑结构,2018,48(7):79-86.Zhang Xizhi,Zhang Shaohua,Niu Sixin.Research and prospect of precast concrete tubular column in prefabricated buildings[J].Building Structure,2018,48(7):79-86(in Chinese).
[3]Seo S Y,Yoon S J,Lee W J.Evaluation of structural performance the hollow PC column joint subjected to cyclic lateral load[J].Journal of the Korea Concrete Institute,2008,20(3):335-343.
[4]Yeh Y K,Mo Y L,Yang C Y.Seismic performance of rectangular hollow bridge columns[J].Journal of Structural Engineering,2002,128(1):60-68.
[5]Yeh Y K,Mo Y L,Yang C Y.Full-scale tests on rectangular hollow bridge piers[J].Material and Structures,2002,35(2):117-125.
[6]Calvi G M,Pavese A,Rasulo A,et al.Experimental and numerical studies on the seismic response of RChollow bridge piers[J].Bulletin of Earthquake Engineering,2005,3(3):267-297.
[7]Delgado R,Delgado P,Pouca N V,et al.Shear effects on hollow section piers under seismic actions:Experimental and numerical analysis[J].Bulletin of Earthquake Engineering,2009,7(2):377-389.
[8]Shin M,Choi Y Y,Sun C H,et al.Shear strength model for reinforced concrete rectangular hollow columns[J].Engineering Structures,2013,56(2):958-969.
[9]Kim I H,Sun C H,Shin M.Concrete contribution to initial shear strength of RC hollow columns[J].Structural Engineering and Mechanics,2012,41(1):43-65.
[10]张锡治,蔡魏巍,张潮,等.变轴压比预制高强混凝土混合配筋管柱抗震性能研究[J].天津大学学报:自然科学与工程技术版,2017,50(2):167-173.Zhang Xizhi,Cai Weiwei,Zhang Chao,et al.Seismic behavior of prefabricated high strength concrete pipe column with mixed reinforcement under various axialcompression ratio[J].Journal of Tianjin University:Science and Technology,2017,50(2):167-173(in Chinese).
[11]GB/T 228.1-2010金属材料拉伸试验第1部分:室温试验方法[S].北京:中国标准出版社,2010.GB/T 228.1-2010 Metallic Materials-Tensile TestingPart 1:Method of Test at Room Temperature[S].Beijing:Standards Press of China,2010(in Chinese).
[12]GB/T 50152-2012混凝土结构试验方法标准[S].北京:中国建筑工业出版社,2012.GB/T 50152-2012 Standard for Test Method of Concrete Structures[S].Beijing:China Architecture&Building Press,2012(in Chinese).
[13]Park R.Evaluation of ductility of structures and structural assemblages from laboratory testing[J].Bulletin of the New Zealand National Society for Earthquake Engineering,1989,22(3):155-166.
[14]赵国藩.高等钢筋混凝土结构学[M].北京:机械工业出版社,2008.Zhao Guofan.Advanced Reinforced Concrete Structures[M].Beijing:China Machine Press,2008(in Chinese).
[15]Priestley M J N,Verma R,Xiao Y.Seismic shear strength of reinforced concrete columns[J].Journal of Structural Engineering,1994,120(8):2310-2329.