高轴压比下UHTCC梁柱节点抗震性能试验
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摘要
通过4个超高韧性水泥基复合材料(UHTCC)新型梁柱节点的低周反复荷载试验,研究了高轴压比下节点的裂缝特征、承载能力和荷载-变形滞回曲线.结果表明:UHTCC可有效控制裂缝宽度,呈多缝开裂,核心区箍筋间距减少对提高节点的抗剪承载力和剪切延性不明显,在极限荷载下节点核心区剪切变形引起的梁端位移占梁端总位移的比例约45%～70%,高轴压比下UHTCC节点具有较强的耗能能力和抗震性能.
Based on four experiments of new ultra high toughness cementitious composites beam-column joints under reversed cyclic loading,the crack patterns of joints,loading capacity and load-displacement hysteresis loops were studied under high axial compression ratio. The results show that ultra high toughness cementitious composites (UHTCC) could effectively control crack width and exhibit the characteristics of multiple fine cracking capabilities. It is also found that the stirrups space had no little effect on shear capacity and shear ductility of joints. At ultimate load the displacement of the beam end due to the shear deformation in the joint core is about 45%~70% of its global deformation,the energy dissipation and seismic behaviors of UHTCC joints are superior under high axial compression ratio.
Based on four experiments of new ultra high toughness cementitious composites beam-column joints under reversed cyclic loading,the crack patterns of joints,loading capacity and load-displacement hysteresis loops were studied under high axial compression ratio. The results show that ultra high toughness cementitious composites (UHTCC) could effectively control crack width and exhibit the characteristics of multiple fine cracking capabilities. It is also found that the stirrups space had no little effect on shear capacity and shear ductility of joints. At ultimate load the displacement of the beam end due to the shear deformation in the joint core is about 45%~70% of its global deformation,the energy dissipation and seismic behaviors of UHTCC joints are superior under high axial compression ratio.
引文
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[2]Li V C.Engineered cementitious composites(ECC):a reviewof the material andits applications[J].Journal of Advanced Concrete Technology,2003,1(3):215-230.
[3]徐世火良,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.
[4]徐世火良,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.
[5]中华人民共和国建设部.建筑抗震设计规范GB50011—2001[S].北京:中国建筑工业出版社,2001.
[6]Ehsani MR,Alameddine F.Design recommendations for type2high-strength reinforced concrete connec-tions[J].ACI Structural Journal,1991,88(3):277-291.
[7]李振宝,郭二伟,周宏宇,等.RC框架节点核芯区剪切破坏-抗震性能试验[J].世界地震工程,2009,25(3):61-66.
[8]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社,1989.
[9]钱稼茹,江源.钢筋混凝土梁-钢管混凝土组合柱节点抗震性能试验[J].建筑结构,2009,39(9):39-42.
[10]Li V 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):531-536.
[11]徐世火良,李贺东.超高韧性水泥基复合材料研究进展及其工程应用[J].土木工程学报,2008,41(6):45-59.
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