内置角钢改进夹心节点抗震性能研究与抗剪承载力计算
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摘要
梁柱采用不同强度混凝土的节点核心区通常采用同柱等强的高强度混凝土浇筑(传统节点),而采用同梁等强的低强度混凝土浇筑(夹心节点)可简化施工过程,但同时降低了节点的抗震性能。为研究内置角钢改进夹心节点的可行性,通过一个空间夹心节点和一个内置角钢空间夹心节点试件进行双向等幅低周往复试验研究,对比分析了破坏模式、延性、耗能、刚度、应变和抗剪承载力等方面的差异。结果表明:采取改进和不采取改进措施节点破坏模式均以梁端屈服后的节点破坏为主,但采取改进措施的试件延性和抗剪承载力明显提高,耗能能力、刚度退化和变形能力有一定改善,表明改进措施改善了节点的抗震性能。最后在此基础上,给出了与该文和其他文献试验结果吻合较好的采取或者不采取改进措施夹心节点抗剪承载力计算公式。
The joint core area is always casted with higher strength concrete of column. The sandwich beam-column joints core area casted with weaker strength concrete of beam can simplify the construction process,but the seismic performance of the joint is impaired. To study the feasibility of the sandwich joint improved with built-in angle iron, one unimproved and one improved 3 D sandwich joints were tested under bi-directional reversed cyclic loads with constant amplitude to investigate the seismic behavior, including the failure mode,ductility, energy dissipation, stiffness, strain and shear strength. The test results show that, two specimens exhibit joint failure after the beam longitudinal reinforcement yields in the joint under bi-directional loads. However, the enhancement measure increases ductility and shear strength, improves energy dissipation, stiffness declination and deformation capacity, which indicates that the seismic performance of sandwich joint is improved. Finally, the formula is presented for calculating shear strength of the sandwich joints, and the solutions agree well with the experimental results of unimproved and improved sandwich joints.
The joint core area is always casted with higher strength concrete of column. The sandwich beam-column joints core area casted with weaker strength concrete of beam can simplify the construction process,but the seismic performance of the joint is impaired. To study the feasibility of the sandwich joint improved with built-in angle iron, one unimproved and one improved 3 D sandwich joints were tested under bi-directional reversed cyclic loads with constant amplitude to investigate the seismic behavior, including the failure mode,ductility, energy dissipation, stiffness, strain and shear strength. The test results show that, two specimens exhibit joint failure after the beam longitudinal reinforcement yields in the joint under bi-directional loads. However, the enhancement measure increases ductility and shear strength, improves energy dissipation, stiffness declination and deformation capacity, which indicates that the seismic performance of sandwich joint is improved. Finally, the formula is presented for calculating shear strength of the sandwich joints, and the solutions agree well with the experimental results of unimproved and improved sandwich joints.
引文
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[3]Kayani M K.Load transfer from high strength concrete columns through lower strength concrete slabs[D].Urbana:University of Illinois at Urbana-Champaign,1992.
[4]Ospina C E,Alexander S D.Transmission of interior concrete column loads through floors[J].Journal of Structural Engineering,1998,6(124):602-610.
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[9]Guidotti R,Ruiz M F,Muttoni A.Crushing and flexural strength of slab-column joints[J].Engineering Structures,2011,33(3):855-867.
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[11]Shin H O,Yoon Y S,Mitchell D.Axial load transfer in non-slender ultra-high-strength concrete columns through normal-strength concrete floor slabs[J].Engineering Structures,2017,136:466-480.
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[13]杨治洪.RC框架夹心节点抗震性能及设计方法研究[D].重庆:重庆大学,2010.Yang zhihong.Seismic behavior and design method of RC sandwich beam-column joints[D].Chongqing:Chongqing University,2016.(in Chinese)
[14]曹晖,陈祥,华建民.偏心夹心梁柱节点低周反复加载受力性能试验研究[J].工程力学,2012,29(10):257-262.Cao Hui,Chen Xiang,Hua Jianmin.Experimental study on behavior of eccentric beam-column sandwich joints under cyclic loading[J].Engineering Mechanics,2012,29(10):257-262.(in Chinese)
[15]侯立群.RC梁板柱空间夹心节点抗震性能及设计方法研究[D].北京:北京工业大学,2016.Hou Liqun.Research on seismic behavior and design method of 3D sandwich joints with slabs[D].Beijing:Beijing University of Technology,2016.(in Chinese)
[16]闫维明,侯立群,陈适才,等.双向荷载作用下空间夹心节点受力性能试验研究[J].工程力学.2016,33(5):211-219.Yan Weiming,Hou Liqun,Chen Shicai,et al Experimental study on the mechanical behavior of 3Dsandwich joints under bi-directional loading[J].Engineering Mechanics,2016,33(5):211-219.(in Chinese)
[17]GB 50010-2010,混凝土结构设计规范:[S].北京:中国建筑工业出版社,2010.GB 50011-2010,Code for design of concrete structures[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
[18]布欣,谷倩,王新武.剖分T型钢梁柱连接框架中柱空间节点抗震试验研究[J].工程力学,2017,34(8):105-116.Bu Xin,Gu Qian,Wang Xinwu.Experimental study on the seismic performance of three-dimensional beam to middle column connection with T-stub[J].Engineering Mechanics,2017,34(8):105-116.(in Chinese)
[19]Shafaei J,Hosseini A,Marefat M S,et al.Experimental evaluation of seismically and non-seismically detailed external RC beam-column joints[J].Journal of Earthquake Engineering,2017,21(5):776-807.
[20]Beydokht E Z,Shariatmadar H.Strengthening and rehabilitation of exterior RC beam-column joints using carbon-FRP jacketing[J].Materials and Structures,2016,49(12):1-17.
[21]Paulay T,Park R,Priestley M J N.Reinforced concrete beam-column joint sunder seismic actions[J].ACIJournal,1978,75(11):585-593.
[22]ACI Committee 318.Building code requirements for structural concrete and commentary(ACI 318-2008)[S].Farmington Hills:ACI,2008.
[23]Hwang S J,Lee H J.Analytical model for predicting shear strengths of interior reinforced concrete beam-column joints for seismic resistance[J].ACIStructural Journal,2000,97(1):35-44.
[24]Tsonos A G.Cyclic load behavior of RC beam-column subassemblages of modern structures[J].ACI Structural Journal,2007,104(4):468-478.
[25]Shiohara H.New Model for Shear Failure of RC Interior Beam-Column Connections[J].Journal of Structural Engineering,2001,127(2):152-160.
[26]Kuang J S,Wong H F.Effects of beam-column depth ratio on joint seismic behavior[J].Structures&Buildings,2008,161(2):91-101.
[27]Wang G L,Dai J G,Teng J G.Shear strength model for RC beam-column joints under seismic loading[J].Engineering Structures,2012,40:350-360.
[28]Kupfer H B,Gerstle K H.Behaviour of concrete under biaxial stress[J].ACI Journal,1969,66:853-866.
[29]Vollum R L,Newman J B.The design of external reinforced concrete beam-column joints[J].The Structural Engineer,1999,77(23&24):21-27.
[30]傅剑平,白绍良,王峥,等.考虑轴压比影响的钢筋混凝土框架内节点抗震性能试验研究[J].土木建筑与环境工程,2000,22(z1):64-70.Fu Jianping,Bai Shaoliang,Wang Zheng,et al.Effect of Axial Force Ratio on Seismic Behavior of Interior Joints of RC Frames[J].Journal of Civil,Architectural and Environmental Engineering,2000,22(z1):64-70.(in Chinese)
[31]CSA A23.3-14,CSA Committee A23.3.Design of concrete structures[S].Toronto,Ontario:Canadian Standard Association,2014.
[32]周小真,石启印,姜维山.混凝土内含角钢柱在低周反复荷载作用下的抗震性能研究[J].哈尔滨建筑大学学报,1993(增1):60-67.Zhou Xiaozhen,Shi Qiyin,Jiang Weishan.Research on seismic performance of concrete columns with built-in angle iron under cyclic loading in low cycle[J].Journal of Harbin architecture university,1993(Suppl 1):60-67.(in Chinese)
[2]Hawkins M N,Bao A,Yamazaki J.Moment transfer from concrete slabs to columns[J].ACI Structural Journal,1989,6(86):705-716.
[3]Kayani M K.Load transfer from high strength concrete columns through lower strength concrete slabs[D].Urbana:University of Illinois at Urbana-Champaign,1992.
[4]Ospina C E,Alexander S D.Transmission of interior concrete column loads through floors[J].Journal of Structural Engineering,1998,6(124):602-610.
[5]Mc Harg P J,Cook W D,Mitchell D,et al.Improved transmission of high-strength concrete column loads through normal strength concrete slabs[J].ACIStructural Journal,2000,97(1):157-165.
[6]Portella J.Transmission of high strength concrete corner column loads through normal strength concrete slabs[D].Victoria,Australia:University of Melbourne,2003.
[7]Lee J,Yoon Y,Cook W D,et al.Benefits of using puddled HSC with fibers in slabs to transmit HSCcolumn loads[J].Journal of Structural Engineering-ASCE,2007,133(12):1843-1847.
[8]Lee J H,Yang J M,Yoon Y S.Strategic slab-column joint details for improved transmission of HSC column loads[J].Magazine of Concrete Research,2008,60(2):85-91.
[9]Guidotti R,Ruiz M F,Muttoni A.Crushing and flexural strength of slab-column joints[J].Engineering Structures,2011,33(3):855-867.
[10]Shin H O,Yoon Y S,Cook W D,et al.Enhancing the performance of UHSC columns intersected by weaker slabs[J].Engineering Structures,2016,127:359-373.
[11]Shin H O,Yoon Y S,Mitchell D.Axial load transfer in non-slender ultra-high-strength concrete columns through normal-strength concrete floor slabs[J].Engineering Structures,2017,136:466-480.
[12]余琼,李思明.核心区和柱混凝土强度不等时节点的性能研究[J].同济大学学报(自然科学版),2004,32(12):1583-1588.Yu Qiong,Li Siming.Research on frame’s joint that concrete strength of core is inferior to that of column[J].Journal of Tongji University(Natural Science),2004,32(12):1583-1588.(in Chinese)
[13]杨治洪.RC框架夹心节点抗震性能及设计方法研究[D].重庆:重庆大学,2010.Yang zhihong.Seismic behavior and design method of RC sandwich beam-column joints[D].Chongqing:Chongqing University,2016.(in Chinese)
[14]曹晖,陈祥,华建民.偏心夹心梁柱节点低周反复加载受力性能试验研究[J].工程力学,2012,29(10):257-262.Cao Hui,Chen Xiang,Hua Jianmin.Experimental study on behavior of eccentric beam-column sandwich joints under cyclic loading[J].Engineering Mechanics,2012,29(10):257-262.(in Chinese)
[15]侯立群.RC梁板柱空间夹心节点抗震性能及设计方法研究[D].北京:北京工业大学,2016.Hou Liqun.Research on seismic behavior and design method of 3D sandwich joints with slabs[D].Beijing:Beijing University of Technology,2016.(in Chinese)
[16]闫维明,侯立群,陈适才,等.双向荷载作用下空间夹心节点受力性能试验研究[J].工程力学.2016,33(5):211-219.Yan Weiming,Hou Liqun,Chen Shicai,et al Experimental study on the mechanical behavior of 3Dsandwich joints under bi-directional loading[J].Engineering Mechanics,2016,33(5):211-219.(in Chinese)
[17]GB 50010-2010,混凝土结构设计规范:[S].北京:中国建筑工业出版社,2010.GB 50011-2010,Code for design of concrete structures[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
[18]布欣,谷倩,王新武.剖分T型钢梁柱连接框架中柱空间节点抗震试验研究[J].工程力学,2017,34(8):105-116.Bu Xin,Gu Qian,Wang Xinwu.Experimental study on the seismic performance of three-dimensional beam to middle column connection with T-stub[J].Engineering Mechanics,2017,34(8):105-116.(in Chinese)
[19]Shafaei J,Hosseini A,Marefat M S,et al.Experimental evaluation of seismically and non-seismically detailed external RC beam-column joints[J].Journal of Earthquake Engineering,2017,21(5):776-807.
[20]Beydokht E Z,Shariatmadar H.Strengthening and rehabilitation of exterior RC beam-column joints using carbon-FRP jacketing[J].Materials and Structures,2016,49(12):1-17.
[21]Paulay T,Park R,Priestley M J N.Reinforced concrete beam-column joint sunder seismic actions[J].ACIJournal,1978,75(11):585-593.
[22]ACI Committee 318.Building code requirements for structural concrete and commentary(ACI 318-2008)[S].Farmington Hills:ACI,2008.
[23]Hwang S J,Lee H J.Analytical model for predicting shear strengths of interior reinforced concrete beam-column joints for seismic resistance[J].ACIStructural Journal,2000,97(1):35-44.
[24]Tsonos A G.Cyclic load behavior of RC beam-column subassemblages of modern structures[J].ACI Structural Journal,2007,104(4):468-478.
[25]Shiohara H.New Model for Shear Failure of RC Interior Beam-Column Connections[J].Journal of Structural Engineering,2001,127(2):152-160.
[26]Kuang J S,Wong H F.Effects of beam-column depth ratio on joint seismic behavior[J].Structures&Buildings,2008,161(2):91-101.
[27]Wang G L,Dai J G,Teng J G.Shear strength model for RC beam-column joints under seismic loading[J].Engineering Structures,2012,40:350-360.
[28]Kupfer H B,Gerstle K H.Behaviour of concrete under biaxial stress[J].ACI Journal,1969,66:853-866.
[29]Vollum R L,Newman J B.The design of external reinforced concrete beam-column joints[J].The Structural Engineer,1999,77(23&24):21-27.
[30]傅剑平,白绍良,王峥,等.考虑轴压比影响的钢筋混凝土框架内节点抗震性能试验研究[J].土木建筑与环境工程,2000,22(z1):64-70.Fu Jianping,Bai Shaoliang,Wang Zheng,et al.Effect of Axial Force Ratio on Seismic Behavior of Interior Joints of RC Frames[J].Journal of Civil,Architectural and Environmental Engineering,2000,22(z1):64-70.(in Chinese)
[31]CSA A23.3-14,CSA Committee A23.3.Design of concrete structures[S].Toronto,Ontario:Canadian Standard Association,2014.
[32]周小真,石启印,姜维山.混凝土内含角钢柱在低周反复荷载作用下的抗震性能研究[J].哈尔滨建筑大学学报,1993(增1):60-67.Zhou Xiaozhen,Shi Qiyin,Jiang Weishan.Research on seismic performance of concrete columns with built-in angle iron under cyclic loading in low cycle[J].Journal of Harbin architecture university,1993(Suppl 1):60-67.(in Chinese)