纤维增强混凝土剪力墙恢复力模型试验与理论研究
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摘要
以4个纤维增强混凝土剪力墙试件在低周往复水平荷载作用下的抗震性能试验为基础,考虑纤维增强混凝土的延性和应变硬化特性,分析纤维增强混凝土剪力墙的受力性能,推导整个受力过程不同阶段剪力墙顶点位移公式,建立剪力墙截面弯矩-曲率关系。通过与试验结果的比较,验证公式的合理性。在理论分析的基础上,以开裂点、屈服点、峰值点和极限点为特征点,并考虑刚度退化得出四线型荷载-位移恢复力模型,给出各特征点理论计算公式。利用此恢复力模型通过有限元软件ABAQUS建立纤维增强混凝土剪力墙非线性模型,模拟曲线与试验恢复力曲线较为吻合,表明提出的纤维增强混凝土剪力墙恢复力模型可为非线性分析提供依据。
Based on the seismic experiments of 4 Fiber Reinforced Concrete(FRC) shear walls under cyclic loading,the mechanical behaviors of FRC shear walls were investigated with the ductility and strain-hardening of FRC considered,the analytical formulae of top displacement at different stages of the entire loading process were derived,and the crosssection moment-curvature relationships of shear walls were established.Comparison between the calculated and the experimental results verifies the feasibility of the formulae.The restoring force model of FRC shear walls was established based on the theoretical analysis and experimental results,and a four-linear skeleton curve model considering stiffness degradation was proposed,by taking cracking point,yield point,peak point and ultimate point as feature points.The formulae of calculating these points are recommended through theoretical analysis.The nonlinear analysis,in which the four-linear skeleton curve model was taken into account,was performed to simulate the complete loading and mechanical behavior by using the finite element software ABAQUS.Consequently,the reliability of the finite element model was validated by the good agreement between analysis results and experimental results,providing the theoretical basis for nonlinear analysis.
Based on the seismic experiments of 4 Fiber Reinforced Concrete(FRC) shear walls under cyclic loading,the mechanical behaviors of FRC shear walls were investigated with the ductility and strain-hardening of FRC considered,the analytical formulae of top displacement at different stages of the entire loading process were derived,and the crosssection moment-curvature relationships of shear walls were established.Comparison between the calculated and the experimental results verifies the feasibility of the formulae.The restoring force model of FRC shear walls was established based on the theoretical analysis and experimental results,and a four-linear skeleton curve model considering stiffness degradation was proposed,by taking cracking point,yield point,peak point and ultimate point as feature points.The formulae of calculating these points are recommended through theoretical analysis.The nonlinear analysis,in which the four-linear skeleton curve model was taken into account,was performed to simulate the complete loading and mechanical behavior by using the finite element software ABAQUS.Consequently,the reliability of the finite element model was validated by the good agreement between analysis results and experimental results,providing the theoretical basis for nonlinear analysis.
引文
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[11]李国强,崔大光.钢骨混凝土梁柱框支剪力墙试验与恢复力模型研究[J].建筑结构学报,2008,29(4):73-80(Li Guoqiang,Cui Daguang.Experimental study on the restoring force model of shear wall supported on the frame with steel reinforcing[J].Journal of Building Structures,2008,29(4):73-80(in Chinese))
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[14]钱稼茹,程丽荣,周栋梁.普通箍筋约束混凝土柱的中心受压性能[J].清华大学学报:自然科学版,2002,42(10):1369-1373(Qian Jiaru,Cheng Lirong,Zhou Dongliang.Behavior of axially loaded concrete columns confined with ordinary hoops[J].Journal of Tsinghua University:Science and Technology,2002,42(10):1369-1373(in Chinese))
[15]李艳,梁兴文,刘泽军.HPFRCC常规三轴受压强度和变形特性[J].建筑材料学报,2004,15(2):168-183(Li Yan,Liang Xingwen,Liu Zejun.Strength and deformation properties of HPFRCC under conventional triaxial compression[J].Journal of Building Materials,2004,15(2):168-183(in Chinese))
[16]寇佳亮,邓明科,梁兴文.延性纤维增强混凝土单轴拉伸性能试验研究[J].建筑结构,2013,43(1):59-64(Kou Jialiang,Deng Mingke,Liang Xingwen.Experimental study of uniaxial tensile properties of ductile fiber reinforced concrete[J].Building Structure,2013,43(1):59-64(in Chinese))
[17]徐世烺,李庆华.超高韧性水泥基复合材料在高性能建筑结构中的基本应用[M].北京:科学出版社,2010(Xu Shilang,Li Qinghua.Basic application of ultra high toughness cementitious composites in advanced engineering structures[M].Beijing:Science Press,2010(in Chinese))
[18]邓明科.高性能混凝土剪力墙基于性能设计的抗震设计理论与试验研究[D].西安:西安建筑科技大学,2006(Deng Mingke.Theory and experimental research on performance-based seismic design of high performance concrete shear wall[D].Xi’an:Xi’an University of Architecture and Technology,2006(in Chinese))
[19]马恺泽,梁兴文,李响,等.型钢混凝土剪力墙恢复力模型研究[J].工程力学,2011,28(8):119-125(Ma Kaize,Liang Xingwen,Li Xiang,et al.Restoring force model of steel reinforced concrete shear walls[J].Engineering Mechanics,2011,28(8):119-125(in Chinese))
[2]Parra-Montesinos G J,Canbolat B A,Jeyaraman G R.Relaxation of confinement reinforcement requirements in structural walls through the use of fiber reinforced cement composites[C]//Proceedings of the 8th National Conference on Earthquake Engineering.San Francisco,CA,2006
[3]Dazio A,Buzzini D,Trub M.Nonlinear cyclic behaviour of hybrid fibre concrete structural walls[J].Engineering Structures,2008,30(11):3141-3150
[4]Li V C,Leung C K.Steady-state and multiple cracking of short random fiber composites[J].Journal of Engineering Mechanics,1992,118(11):2246-2264
[5]Li V C.ECC-tailored composites through micromechanical modeling[C]//Fiber Reinforced Concrete:Present and the Future.Montreal,1998:64-97
[6]Li V C.On engineered cementitious composites(ECC)—a review of the material and its applications[J].Journal of Advanced Concrete Technology,2003,1(3):215-230
[7]Li V C,Wang S,Wu C.Tensile strain-hardening behavior of polyvinyl alcohol engineered cementitious composite(PVA-ECC)[J].ACI Materials Journal-American Concrete Institute,2001,98(6):483-492
[8]吕西林,董宇光,丁子文.截面中部配置型钢的混凝土剪力墙抗震性能研究[J].地震工程与工程振动,2006,26(6):101-107(Lu Xilin,Dong Yuguang,Ding Ziwen.Study on seismic behavior of steel reinforced concrete wall[J].Earthquake Engineering and Engineering Vibration,2006,26(6):101-107(in Chinese))
[9]郭子雄,杨勇.恢复力模型研究现状及存在问题[J].世界地震工程,2004,20(4):47-51(Guo Zixiong,Yang Yong.State-of-the-art of restoring force models for RC structures[J].World Earthquake Engineering,2004,20(4):47-51(in Chinese))
[10]李宏男,李兵.钢筋混凝土剪力墙抗震恢复力模型及试验研究[J].建筑结构学报,2004,25(5):35-42(Li Hongnan,Li Bing.Experimental study on seismic restoring performance of reinforced concrete shear walls[J].Journal of Building Structures,2004,25(5):35-42(in Chinese))
[11]李国强,崔大光.钢骨混凝土梁柱框支剪力墙试验与恢复力模型研究[J].建筑结构学报,2008,29(4):73-80(Li Guoqiang,Cui Daguang.Experimental study on the restoring force model of shear wall supported on the frame with steel reinforcing[J].Journal of Building Structures,2008,29(4):73-80(in Chinese))
[12]梁兴文.结构抗震性能设计理论与方法[M].北京:科学出版社,2011
[13]Priestley M,Kowalsky M J.Direct displacement-based seismic design of concrete buildings[J].Bulletin of the New Zealand National Society for Earthquake Engineering,2000,33(4):421-444
[14]钱稼茹,程丽荣,周栋梁.普通箍筋约束混凝土柱的中心受压性能[J].清华大学学报:自然科学版,2002,42(10):1369-1373(Qian Jiaru,Cheng Lirong,Zhou Dongliang.Behavior of axially loaded concrete columns confined with ordinary hoops[J].Journal of Tsinghua University:Science and Technology,2002,42(10):1369-1373(in Chinese))
[15]李艳,梁兴文,刘泽军.HPFRCC常规三轴受压强度和变形特性[J].建筑材料学报,2004,15(2):168-183(Li Yan,Liang Xingwen,Liu Zejun.Strength and deformation properties of HPFRCC under conventional triaxial compression[J].Journal of Building Materials,2004,15(2):168-183(in Chinese))
[16]寇佳亮,邓明科,梁兴文.延性纤维增强混凝土单轴拉伸性能试验研究[J].建筑结构,2013,43(1):59-64(Kou Jialiang,Deng Mingke,Liang Xingwen.Experimental study of uniaxial tensile properties of ductile fiber reinforced concrete[J].Building Structure,2013,43(1):59-64(in Chinese))
[17]徐世烺,李庆华.超高韧性水泥基复合材料在高性能建筑结构中的基本应用[M].北京:科学出版社,2010(Xu Shilang,Li Qinghua.Basic application of ultra high toughness cementitious composites in advanced engineering structures[M].Beijing:Science Press,2010(in Chinese))
[18]邓明科.高性能混凝土剪力墙基于性能设计的抗震设计理论与试验研究[D].西安:西安建筑科技大学,2006(Deng Mingke.Theory and experimental research on performance-based seismic design of high performance concrete shear wall[D].Xi’an:Xi’an University of Architecture and Technology,2006(in Chinese))
[19]马恺泽,梁兴文,李响,等.型钢混凝土剪力墙恢复力模型研究[J].工程力学,2011,28(8):119-125(Ma Kaize,Liang Xingwen,Li Xiang,et al.Restoring force model of steel reinforced concrete shear walls[J].Engineering Mechanics,2011,28(8):119-125(in Chinese))
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