超高韧性水泥基材料新型框架节点性能研究
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摘要
进行了9个超高韧性水泥基复合材料(UHTCC)新型框架节点的抗震试验。研究了轴压比和核心区箍筋间距对新型节点承载能力、滞回特性和耗能能力的影响。结果表明,UHTCC节点出现了大量裂缝间距仅为1mm左右的微细斜向裂缝,节点的开裂荷载和抗剪承载力都有明显的提高。UHTCC材料可降低甚至消除节点核芯区箍筋的用量。在试验基础上,对UHTCC新型框架节点的开裂荷载和极限承载力进行了理论计算,计算值和试验结果总体吻合较好。
The seismic experiments of 9 ultra-hightoughness cementitious composites(UHTCC) frame joints were conducted.The load-carrying capacity,hysteretic behavior,energy dissipation and ductility of new joints were studied under different axial compressive ratio and the stirrups space.The results show that a lot of fine diagonal crack appear in the UHTCC joints and the average crack space is about 1mm.The UHTCC joints had higher anti-cracking capacity and shear ductility.It can reduce or even eliminate the amount of shear stirrups of the core of the joints.Based on the test results,a theoretical calculating formula of crack load and shearing capacity was presented,whose results agree well with the experimental results.
The seismic experiments of 9 ultra-hightoughness cementitious composites(UHTCC) frame joints were conducted.The load-carrying capacity,hysteretic behavior,energy dissipation and ductility of new joints were studied under different axial compressive ratio and the stirrups space.The results show that a lot of fine diagonal crack appear in the UHTCC joints and the average crack space is about 1mm.The UHTCC joints had higher anti-cracking capacity and shear ductility.It can reduce or even eliminate the amount of shear stirrups of the core of the joints.Based on the test results,a theoretical calculating formula of crack load and shearing capacity was presented,whose results agree well with the experimental results.
引文
[1]徐世烺,李贺东.超高韧性水泥基复合材料直接拉伸试验研究[J].土木工程学报,2009,42(9):32-41.XU Shilang,Li Hedong.Uniaxial tensile experiments on ultra-high toughness cementitious composite[J].China Civil Engineering Journal,2009,42(9):32-41.
[2]徐世烺,蔡向荣.超高韧性纤维增强水泥基复合材料基本力学性能[J].水利学报,2009,40(9):1055-1063.XU Shilang,CAI Xiangrong.Experimental study on mechanical properties of ultra-high toughness fiber reinforced cementitious composite[J].Journal of Hydraulic Engineering,2009,40(9):1055-1063.
[3]Li Victor C,高延性纤维增强水泥基复合材料的研究进展及应用[J].硅酸盐学报,2007,35(4):531-536Li Victor C,Progress and application of engineered cementitious composites[J].Journal of the Chinese Ceramic Society,2007,35(4):531-536.
[4]徐世烺,张秀芳.钢筋增强超高韧性水泥基复合材料RUHTCC受弯梁的理论计算与试验研究[J],中国科学E辑:技术科学,2009,39(5):878-896.XU Shilang,zhang Xiufang.Theoretical analysis and experimental investigation on flexural performance of steel reinforced ultra-high toughness ce-mentitious composite RUHTCC beams[J].Science in China Series E;Technological science,2009,39(5):878-896.
[5]GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.GB50011-2001,Code for seismic design of buildings[S].Beijing:China Architecture&Building Press,2001.
[6]苏骏,徐世烺.高轴压比下UHTCC梁柱节点抗震性能试验[J].华中科技大学学报,2010,38(7):53-56.SU Jun,XU Shilang.Experimental study on seismic behaviors of UHTCC new beam-column joints with high axial compression[J].journal ofHuazhong University of Science and Technology,2010,38(7):53-56.
[7]苏骏,徐世烺,毕辉.UHTCC新型梁柱节点抗震性能试验研究[J].地震工程与工程振动,2010,30(2):59-63.SU Jun,XU Shilang,BI Hui.Experimental research on seismic behaviors of new beam-column joints by using cementitious composites with ultra-high toughness[J].journal of Earthquake Engineering and Engineering Vibration,2010,30(2):59-63.
[8]邢国华,吴涛,刘伯权,等.钢筋混凝土框架异型中节点抗裂度计算[J].工业建筑,2009,39(6):55-58.Xing Guohua,Wu Tao,Liu Boquan,et al.Calculation on crack resistance capacity of abnormal interior joints in reinforced concrete frame struc-tures[J].Industrial Construction,2009,39(6):55-58.
[9]赵鸿铁.钢筋混凝土梁柱节点的抗裂性[J],建筑结构学报,1990,11(6):38-48.Zhao Hongtie.Crack resistance of reinforced concrete beam-column joints[J].Jounal of Building Structures,1990,11(6):38-48.
[10]白国良,朱佳宁,李红星.钢筋混凝土框架异形节点抗裂计算[J].世界地震工程,2003,19(3):12-16.Bai Guoliang,Zhu Jianing,Li Hongxing.The anti-crack calculation on abnormal joint of reinforced concrete frame[J].World Earthquake Engi-neering,2003,19(3):12-16.
[2]徐世烺,蔡向荣.超高韧性纤维增强水泥基复合材料基本力学性能[J].水利学报,2009,40(9):1055-1063.XU Shilang,CAI Xiangrong.Experimental study on mechanical properties of ultra-high toughness fiber reinforced cementitious composite[J].Journal of Hydraulic Engineering,2009,40(9):1055-1063.
[3]Li Victor C,高延性纤维增强水泥基复合材料的研究进展及应用[J].硅酸盐学报,2007,35(4):531-536Li Victor C,Progress and application of engineered cementitious composites[J].Journal of the Chinese Ceramic Society,2007,35(4):531-536.
[4]徐世烺,张秀芳.钢筋增强超高韧性水泥基复合材料RUHTCC受弯梁的理论计算与试验研究[J],中国科学E辑:技术科学,2009,39(5):878-896.XU Shilang,zhang Xiufang.Theoretical analysis and experimental investigation on flexural performance of steel reinforced ultra-high toughness ce-mentitious composite RUHTCC beams[J].Science in China Series E;Technological science,2009,39(5):878-896.
[5]GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.GB50011-2001,Code for seismic design of buildings[S].Beijing:China Architecture&Building Press,2001.
[6]苏骏,徐世烺.高轴压比下UHTCC梁柱节点抗震性能试验[J].华中科技大学学报,2010,38(7):53-56.SU Jun,XU Shilang.Experimental study on seismic behaviors of UHTCC new beam-column joints with high axial compression[J].journal ofHuazhong University of Science and Technology,2010,38(7):53-56.
[7]苏骏,徐世烺,毕辉.UHTCC新型梁柱节点抗震性能试验研究[J].地震工程与工程振动,2010,30(2):59-63.SU Jun,XU Shilang,BI Hui.Experimental research on seismic behaviors of new beam-column joints by using cementitious composites with ultra-high toughness[J].journal of Earthquake Engineering and Engineering Vibration,2010,30(2):59-63.
[8]邢国华,吴涛,刘伯权,等.钢筋混凝土框架异型中节点抗裂度计算[J].工业建筑,2009,39(6):55-58.Xing Guohua,Wu Tao,Liu Boquan,et al.Calculation on crack resistance capacity of abnormal interior joints in reinforced concrete frame struc-tures[J].Industrial Construction,2009,39(6):55-58.
[9]赵鸿铁.钢筋混凝土梁柱节点的抗裂性[J],建筑结构学报,1990,11(6):38-48.Zhao Hongtie.Crack resistance of reinforced concrete beam-column joints[J].Jounal of Building Structures,1990,11(6):38-48.
[10]白国良,朱佳宁,李红星.钢筋混凝土框架异形节点抗裂计算[J].世界地震工程,2003,19(3):12-16.Bai Guoliang,Zhu Jianing,Li Hongxing.The anti-crack calculation on abnormal joint of reinforced concrete frame[J].World Earthquake Engi-neering,2003,19(3):12-16.
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