ECC/RC空心楼盖板柱节点抗冲切性能
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摘要
针对工程水泥基复合材料(ECC)用于板柱结构柱周围局部实心区域形成的ECC/RC空心楼盖板柱节点,可减少结构本身自重,充分发挥ECC材料高强度、高延性和抗剪性能好等特点,以ECC强度、ECC面积、暗梁为参数,对ECC/RC空心楼盖板柱节点进行抗冲切性能数值分析研究。结果表明:ECC材料可显著提高空心楼盖板柱节点的抗冲切承载力和刚度,改善节点的变形能力和耗能能力,但未改变节点的破坏形态,节点仍发生冲切破坏;节点的抗冲切承载力随着ECC强度和ECC面积的提高而增大;当节点仅使用一种增强方式时,暗梁和ECC材料的抗冲切承载力分别为普通混凝土的1.26倍和1.15倍;与暗梁相比,ECC材料对节点抗冲切承载力的提高效果更明显;与同时使用ECC材料和暗梁的节点相比,当节点仅使用ECC材料时,增大ECC面积对节点抗冲切承载力的提高效果更为明显;在进行空心楼盖板柱结构设计时,建议同时使用暗梁和ECC材料,保证节点有较高极限承载力的同时,兼顾良好的变形能力和耗能能力。
Engineered cementitious composite(ECC)is used in local solid area around the column of slab-column structure to form ECC/RC hollow floor slab-column connection(HSEC),which not only has light weight structure,but also makes full use of the characteristic of high strength,high ductility and high shear strength of ECC.The punching shear behavior of HSEC was evaluated through numerical simulation analysis of ECC strength,ECC area and hidden beam.The results show that ECC can increase punching shear capacity and stiffness,improve plastic deformation capacity and energy dissipation capability,but cannot change the failure mode of HSEC,and the connection still has a punching shear failure.The punching shear capacity can be increased as ECC strength and ECC area increase.The punching shear capacities of specimens with ECC and hidden beam are 1.26 and 1.15 times of the punching shear capacity of normal concrete when the unique enhanced method is used.ECC has a better effect in improving theconnections'punching shear capacity in comparison with hidden beam.Comparing with the connections with ECC and hidden beam both,the connection with ECC only has a better effect on improving the punching shear capacity when increasing ECC area.In the hollow floor slab-column design,it is proposed that hidden beam and ECC are used to resist shear force and improve plastic deformation capacity and energy dissipation capability.
Engineered cementitious composite(ECC)is used in local solid area around the column of slab-column structure to form ECC/RC hollow floor slab-column connection(HSEC),which not only has light weight structure,but also makes full use of the characteristic of high strength,high ductility and high shear strength of ECC.The punching shear behavior of HSEC was evaluated through numerical simulation analysis of ECC strength,ECC area and hidden beam.The results show that ECC can increase punching shear capacity and stiffness,improve plastic deformation capacity and energy dissipation capability,but cannot change the failure mode of HSEC,and the connection still has a punching shear failure.The punching shear capacity can be increased as ECC strength and ECC area increase.The punching shear capacities of specimens with ECC and hidden beam are 1.26 and 1.15 times of the punching shear capacity of normal concrete when the unique enhanced method is used.ECC has a better effect in improving theconnections'punching shear capacity in comparison with hidden beam.Comparing with the connections with ECC and hidden beam both,the connection with ECC only has a better effect on improving the punching shear capacity when increasing ECC area.In the hollow floor slab-column design,it is proposed that hidden beam and ECC are used to resist shear force and improve plastic deformation capacity and energy dissipation capability.
引文
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[16] ZHOU J J,PAN J L,LEUNG C K Y.Mechanical Behavior of Fiber-reinforced Engineered Cementitious Composites in Uniaxial Compression[J].Journal of Materials in Civil Engineering,2015,27(1):040141111.
[17] MENG D,HUANG T,ZHANG Y X,et al.Mechanical Behaviour of a Polyvinyl Alcohol Fibre Reinforced Engineered Cementitious Composite(PVA-ECC)Using Local Ingredients[J].Construction and Building Materials,2017,141:259-270.
[18] YU K Q,WANG Y C,YU J T,et al.A Strain-hardening Cementitious Composites with the Tensile Capacity up to 8%[J].Construction and Building Materials,2017,137:410-419.
[19] AMRANE M N,SIDOROFF F.Residual Modal Energy Evaluating of Fatigue Damaged Composite Structure[J].Mechanics,2011,17(1):45-49.
[20]顾雯.ECC增强装配式混凝土剪力墙结构设计参数分析[D].南京:东南大学,2017.GU Wen.Design Parameter Analysis of ECC Reinforced Concrete Shear Wall Structure[D].Nanjing:Southeast University,2017.
[21]庞瑞,党隆基,倪红梅,等.空心楼盖板柱增强节点抗冲切性能数值分析[J].工业建筑,2017,47(2):76-81.PANG Rui,DANG Long-ji,NI Hong-mei,et al.Numerical Study of Punching Shear Behavior of the Hollow Floor Slab-column Reinforced Connection[J].Industrial Construction,2017,47(2):76-81.
[2]党隆基.现浇空心楼盖板柱增强节点抗冲切性能试验研究[D].郑州:河南工业大学,2016.DANG Long-ji.Experimental Study on Punching Shear Behavior of the Cast-in-situ Hollow Floor Slabcolumn Reinforced Connection[D].Zhengzhou:Henan University of Technology,2016.
[3] DAM T X,WIGHT J K,PARRA-MONTESINOS G J.Behavior of Monotonically Loaded Slab-column Connections Reinforced with Shear Studs[J].ACI Structural Journal,2017,114(1):221-232.
[4] El-ENEINA H A,AZIMI H,SENNAH K,et al.Flexural Strengthening of Reinforced Concrete Slabcolumn Connection Using CFRP Sheets[J].Construction and Building Materials,2014,57:126-137.
[5] NGUYEN-MINH L,ROVNAK M.Punching Shear Resistance of Interior GFRP Reinforced Slab-column Connections[J].Journal of Composites for Construction,2013,17(1):2-13.
[6] ZHANG J,LEUNG C K Y,CHEUNG Y N.Flexural Performance of Layered ECC-concrete Composite Beam[J].Composites Science and Technology,2006,66(11):1501-1512.
[7] LI V C,LEUNG C K Y.Steady State and Multiple Cracking of Short Random Fiber Composites[J].Journal of Engineering Mechanics,1992,188(11):2246-2264.
[8] ALYOUSIF A,ANIL O,SAHMARAN M,et al.Comparison of Shear Behaviour of Engineered Cementitious Composite and Normal Concrete Beams with Different Shear Span Lengths[J].Magazine of Concrete Research,2016,68(5):217-228.
[9] YANG J,LIANG S T,ZHU X J,et al.Seismic Behavior of Precast Concrete Coupled Shear Walls with Engineered Cementitious Composite(ECC)in the Critical Cast-in-place Regions[J].Science China Technological Sciences,2017,60(8):1244-1254.
[10] KANG S B,TAN K H,YANG E H.Progressive Collapse Resistance of Precast Beam-column Sub-assemblages with Engineered Cementitious Composites[J].Engineering Structures,2015,98:186-200.
[11]马涛.装配整体式ECC/RC组合框架抗震性能研究[D].南京:东南大学,2013.MA Tao.Study on Seismic Performance of the Precast ECC/RC Composite Frame[D].Nanjing:Southeast University,2013.
[12]袁方.钢筋增强ECC/混凝土组合框架结构抗震性能研究[D].南京:东南大学,2014.YUAN Fang.Seismic Behaviors of Steel Reinforced ECC/Reinforced Concrete Composite Frame Structures[D].Nanjing:Southeast University,2014.
[13] GB 50010—2010,混凝土结构设计规范[S].GB 50010—2010,Code for Design of Concrete Structures[S].
[14] LI V C.A Simplified Micromechanical Model of Compressive Strength of Fiber Reinforced Cementitious Composites[J].Cement and Concrete Composites,1992,14(2):131-141.
[15] LI V C.On Engineering Cementitious Composites(ECC)[J].Journal of Advanced Concrete Technology,2003,1(3):215-229.
[16] ZHOU J J,PAN J L,LEUNG C K Y.Mechanical Behavior of Fiber-reinforced Engineered Cementitious Composites in Uniaxial Compression[J].Journal of Materials in Civil Engineering,2015,27(1):040141111.
[17] MENG D,HUANG T,ZHANG Y X,et al.Mechanical Behaviour of a Polyvinyl Alcohol Fibre Reinforced Engineered Cementitious Composite(PVA-ECC)Using Local Ingredients[J].Construction and Building Materials,2017,141:259-270.
[18] YU K Q,WANG Y C,YU J T,et al.A Strain-hardening Cementitious Composites with the Tensile Capacity up to 8%[J].Construction and Building Materials,2017,137:410-419.
[19] AMRANE M N,SIDOROFF F.Residual Modal Energy Evaluating of Fatigue Damaged Composite Structure[J].Mechanics,2011,17(1):45-49.
[20]顾雯.ECC增强装配式混凝土剪力墙结构设计参数分析[D].南京:东南大学,2017.GU Wen.Design Parameter Analysis of ECC Reinforced Concrete Shear Wall Structure[D].Nanjing:Southeast University,2017.
[21]庞瑞,党隆基,倪红梅,等.空心楼盖板柱增强节点抗冲切性能数值分析[J].工业建筑,2017,47(2):76-81.PANG Rui,DANG Long-ji,NI Hong-mei,et al.Numerical Study of Punching Shear Behavior of the Hollow Floor Slab-column Reinforced Connection[J].Industrial Construction,2017,47(2):76-81.