RC梁-CCFST柱加强环式节点抗剪承载力计算分析
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摘要
对钢筋混凝土(RC)梁-圆形钢管混凝土(CCFST)柱节点核心区的抗剪机理进行了分析;基于商用软件ABAQUS,建立了综合考虑材料非线性、几何非线性以及接触非线性的有限元模型,在此基础上,对影响节点抗剪承载力的主要因素进行了参数分析,研究了轴压比、材料强度、核心区钢管壁厚、加劲肋及加强环等对节点抗剪承载力的影响;提出了RC梁-CCFST柱节点抗剪承载力的计算公式。研究结果表明:节点抗剪承载力主要由核心区混凝土、钢管及加劲肋承担,其中混凝土及钢管的相对贡献在95%左右;当轴压比从0增至0.26时,节点抗剪承载力提高近10%;节点抗剪承载力公式计算值与有限元分析结果吻合较好。
The shear mechanism of panel zone of connection between reinforced concrete(RC) beam and circular concrete-filled steel tubular(CCFST) column was analyzed.The nonlinear finite element analysis models considering factors,such as material,geometrical and contact non-linearities were established by using the business software of ABAQUS.Then,parametric analyses were carried out to investigate the main influences of axial compression ratio,material strength of steel tube and concrete in the panel zone,thickness of steel tube,rib stiffeners and stiffening rings and so forth on shear capacity of the connection.The calculation formula of shear capacity of connection between RC beam and CCFST column was put forward.The study results show that the shear capacity of the connection is mainly contributed by the concrete,the steel tube and the rib stiffeners in the panel zone,and the relative contribution of the concrete and the steel tube is about 95%.The shear capacity of the connection approximately increases by 10% when axial compression ratio increases from 0 to 0.26.The calculation results by the formulae are in good agreement with the results by the finite element analysis.
The shear mechanism of panel zone of connection between reinforced concrete(RC) beam and circular concrete-filled steel tubular(CCFST) column was analyzed.The nonlinear finite element analysis models considering factors,such as material,geometrical and contact non-linearities were established by using the business software of ABAQUS.Then,parametric analyses were carried out to investigate the main influences of axial compression ratio,material strength of steel tube and concrete in the panel zone,thickness of steel tube,rib stiffeners and stiffening rings and so forth on shear capacity of the connection.The calculation formula of shear capacity of connection between RC beam and CCFST column was put forward.The study results show that the shear capacity of the connection is mainly contributed by the concrete,the steel tube and the rib stiffeners in the panel zone,and the relative contribution of the concrete and the steel tube is about 95%.The shear capacity of the connection approximately increases by 10% when axial compression ratio increases from 0 to 0.26.The calculation results by the formulae are in good agreement with the results by the finite element analysis.
引文
[1]DBJ 13-51—2003,钢管混凝土结构技术规程[S].DBJ 13-51—2003,Technical Specification for Con-crete-filled Steel Tubular Structures[S].
[2]DL/T 5085—1999,钢-混凝土组合结构设计规程[S].DL/T 5085—1999,Code for Design of Steel-concreteComposite Structure[S].
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[7]李松柏,李桢章,梁继忠.钢管混凝土柱与钢筋混凝土梁不穿心节点抗震性能试验研究[J].建筑结构,2009,39(8):27-31.LI Song-bai,LI Zhen-zhang,LIANG Ji-zhong.Experi-mental Research on Seismic Behavior of Non-through-core Joints of Concrete Beams and Concrete FilledCHS Columns[J].Building Structure,2009,39(8):27-31.
[8]金怀印,薛伟辰,杨晓,等.预应力SRC梁-CFST柱节点受力性能研究[J].哈尔滨工业大学学报,2009,41(增2):160-164.JIN Huai-yin,XUE Wei-chen,YANG Xiao,et al.Re-search on Mechanical Behavior of Connections Be-tween Prestressed Steel Reinforced Concrete Beamsand Concrete-filled Steel Tubular Columns[J].Jour-nal of Harbin Institute of Technology,2009,41(S2):160-164.
[9]尧国皇.钢管混凝土构件在复杂受力状态下的工作机理研究[D].福州:福州大学,2006.YAO Guo-huang.Research on Behaviour of Concrete-filled Steel Tubes Subjected to Complicated LoadingStates[D].Fuzhou:Fuzhou University,2006.
[10]LI W,HAN L H.Seismic Performance of CFST Col-umn to Steel Beam Joints with RC Slab:Analysis[J].Journal of Constructional Steel Research,2011,67(1):127-139.
[11]朱伯龙.结构抗震试验[M].北京:地震出版社,1989:134-147.ZHU Bo-long.Earthquake-resistance Test of Struc-tures[M].Beijing:Earthquake Publishing House,1989:134-147.
[12]赵鸿铁.钢与混凝土组合结构[M].北京:科学出版社,2001:161-178.ZHAO Hong-tie.Steel-concrete Composite Structure[M].Beijing:Science Press,2001:161-178.
[13]CECS 28:90,钢管混凝土结构设计与施工规程[S].CECS 28:90,Specification for Design and Construc-tion of Concrete-filled Steel Tubular Structures[S].
[2]DL/T 5085—1999,钢-混凝土组合结构设计规程[S].DL/T 5085—1999,Code for Design of Steel-concreteComposite Structure[S].
[3]李至钧,阎善章.钢管混凝土框架梁柱刚性抗震节点的试验研究[J].工业建筑,1994,24(2):8-15.LI Zhi-jun,YAN Shan-zhang.The Experimental Re-search on Rigid Aseismatic Beam-column Joints ofConcrete Filled Steel Tubular Frame[J].IndustrialConstruction,1994,24(2):8-15.
[4]陈洪涛,吴时适,肖永福,等.钢管混凝土框架钢筋贯通式刚性节点的实验研究[J].哈尔滨建筑大学学报,1999,32(2):21-25.CHEN Hong-tao,WU Shi-shi,XIAO Yong-fu,et al.The Experimental Research of Steel Bar PassedThrough Rigid Joint of CFST Frame[J].Journal ofHarbin University of Civil Engineering and Architec-ture,1999,32(2):21-25.
[5]吕西林,李学平.方钢管混凝土柱外置式环梁节点的试验及设计方法研究[J].建筑结构学报,2003,24(1):7-13.LU Xi-lin,LI Xue-ping.Experimental Study on Ring-beam Connections Located Outside the Concrete-filled Rectangular Steel Tubular Columns[J].Journalof Building Structures,2003,24(1):7-13.
[6]曲慧,陶忠,韩林海.CFST柱-RC梁钢筋环绕式节点抗震性能试验[J].工业建筑,2006,36(11):27-31,22.QU Hui,TAO Zhong,HAN Lin-hai.ExperimentalInvestigation on Cyclic Performance of Cast Column-RC Beam Joints Enclosed by Rebars[J].IndustrialConstruction,2006,36(11):27-31,22.
[7]李松柏,李桢章,梁继忠.钢管混凝土柱与钢筋混凝土梁不穿心节点抗震性能试验研究[J].建筑结构,2009,39(8):27-31.LI Song-bai,LI Zhen-zhang,LIANG Ji-zhong.Experi-mental Research on Seismic Behavior of Non-through-core Joints of Concrete Beams and Concrete FilledCHS Columns[J].Building Structure,2009,39(8):27-31.
[8]金怀印,薛伟辰,杨晓,等.预应力SRC梁-CFST柱节点受力性能研究[J].哈尔滨工业大学学报,2009,41(增2):160-164.JIN Huai-yin,XUE Wei-chen,YANG Xiao,et al.Re-search on Mechanical Behavior of Connections Be-tween Prestressed Steel Reinforced Concrete Beamsand Concrete-filled Steel Tubular Columns[J].Jour-nal of Harbin Institute of Technology,2009,41(S2):160-164.
[9]尧国皇.钢管混凝土构件在复杂受力状态下的工作机理研究[D].福州:福州大学,2006.YAO Guo-huang.Research on Behaviour of Concrete-filled Steel Tubes Subjected to Complicated LoadingStates[D].Fuzhou:Fuzhou University,2006.
[10]LI W,HAN L H.Seismic Performance of CFST Col-umn to Steel Beam Joints with RC Slab:Analysis[J].Journal of Constructional Steel Research,2011,67(1):127-139.
[11]朱伯龙.结构抗震试验[M].北京:地震出版社,1989:134-147.ZHU Bo-long.Earthquake-resistance Test of Struc-tures[M].Beijing:Earthquake Publishing House,1989:134-147.
[12]赵鸿铁.钢与混凝土组合结构[M].北京:科学出版社,2001:161-178.ZHAO Hong-tie.Steel-concrete Composite Structure[M].Beijing:Science Press,2001:161-178.
[13]CECS 28:90,钢管混凝土结构设计与施工规程[S].CECS 28:90,Specification for Design and Construc-tion of Concrete-filled Steel Tubular Structures[S].
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