梁高不等的混凝土中柱节点抗震性能
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摘要
通过4个1/3比例变梁中节点试件的拟静力试验,分析了轴压比、配箍率等参数对该类异型节点抗震性能的影响;在试验研究的基础上,结合异型中节点左右梁高不等的特性,提出了等效斜压杆破坏机理。结果表明:异型节点通裂荷载与极限荷载接近,初裂出现在小梁上柱组成的小核心区,最终破坏区域主要发生在大梁下柱组成的大核心区;轴压比变化对异型节点抗震性能的影响不显著,增加核心区配箍率则可以增大节点组合体剪力,减小核心区裂缝间距和宽度,从而改善异型节点的抗震性能。
Four specimens of abnormal interior joints were tested under reversed cyclic loading.The experimental study was conducted that focused on the effect of hoop percentage and axial compression ratio on seismic behavior of abnormal joints.The test results indicated that the first cracks appeare in the minor core(determined by the low beam and the top column),and the final failure appeare in the large core(determined by the high beam and the bottom column).The critical crack load is quite nearly with the ultimate load of abnormal joints,and the seismic behavior of the specimens are not influenced by the axial compression ratio but influenced by the joint hoop percentage.With the increasing of joint hoop percentage,the shear strength of the beam-column joint subassemblage increases,the width and space of diagonal cracks become smaller than that of the control specimens.Based on the experimental study,an equivalent strut mechanism for abnormal joint is put forward,and it can be served as a basis for further study on mechanical properties of abnormal beam-column joint.2 tabs,8 figs,10 refs.
Four specimens of abnormal interior joints were tested under reversed cyclic loading.The experimental study was conducted that focused on the effect of hoop percentage and axial compression ratio on seismic behavior of abnormal joints.The test results indicated that the first cracks appeare in the minor core(determined by the low beam and the top column),and the final failure appeare in the large core(determined by the high beam and the bottom column).The critical crack load is quite nearly with the ultimate load of abnormal joints,and the seismic behavior of the specimens are not influenced by the axial compression ratio but influenced by the joint hoop percentage.With the increasing of joint hoop percentage,the shear strength of the beam-column joint subassemblage increases,the width and space of diagonal cracks become smaller than that of the control specimens.Based on the experimental study,an equivalent strut mechanism for abnormal joint is put forward,and it can be served as a basis for further study on mechanical properties of abnormal beam-column joint.2 tabs,8 figs,10 refs.
引文
[1]GB 50010—2002,混凝土结构设计规范[S].
[2]JGJ 101—96,建筑抗震试验方法规程[S].
[3]框架节点专题研究组.低周反复荷载作用下钢筋混凝土框架梁柱节点核心区抗剪强度的试验研究[J].建筑结构学报,1983,4(6):1-17.Research Group on Frame Joints.Shear strength ofreinforced concrete beam-column joints under low re-versed cyclic loading[J].Journal of Building Struc-tures,1983,4(6):1-17.
[4]余琼,吕西林,陆洲导.框架节点反复荷载下的受力性能研究[J].同济大学学报:自然科学版,2004,32(10):1376-1381.YU Qiong,LU Xi-lin,LU Zhou-dao.Research onframe s joint property under low frequency reversedload[J].Journal of Tongji University:Natural Sci-ence,2004,32(10):1376-1381.
[5]叶列平,王宇航.中、美规范钢筋混凝土梁斜截面受剪承载力的计算对比[J].建筑科学与工程学报,2008,25(1):88-95.YE Lie-ping,WANG Yu-hang.Calculation and com-parison of shear strength of RC beams between Chi-nese and American codes[J].Journal of Architectureand Civil Engineering,2008,25(1):88-95.
[6]Paulay T.Equilibrium criteria for reinforced concretebeam column joints[J].ACI Structural Journal,1989,86(6):635-643.
[7]Kim J,LaFave J M.Key influence parameters for thejoint shear behavior of reinforced concrete beam-col-umn connections[J].Engineering Structures,2007,29(10):2523-2539.
[8]Pantazopoulou S J,Bonacci J.Consideration of ques-tions about beam-column joints[J].ACI StructuralJournal,1992,89(1):27-36.
[9]吴涛,刘伯权,邢国华,等.RC框架变梁变柱中节点抗裂性能试验[J].长安大学学报:自然科学版,2009,29(4):77-81.WU Tao,LIU Bo-quan,XING Guo-hua,et al.Crackresistance test of interior joints with abrupt reductionin beam and column section in reinforced concreteframe[J].Journal of Chang an University:NaturalScience Edition,2009,29(4):77-81.
[10]陈招平,董平,黄丽婷.高层建筑地震反应的TLD振动控制[J].建筑科学与工程学报,2008,25(1):122-126.CHEN Zhao-ping,DONG Ping,HUANG Li-ting.TLD vibrational controlling for seismic response ofhigh-rise building[J].Journal of Architecture andCivil Engineering,2008,25(1):122-126.
[2]JGJ 101—96,建筑抗震试验方法规程[S].
[3]框架节点专题研究组.低周反复荷载作用下钢筋混凝土框架梁柱节点核心区抗剪强度的试验研究[J].建筑结构学报,1983,4(6):1-17.Research Group on Frame Joints.Shear strength ofreinforced concrete beam-column joints under low re-versed cyclic loading[J].Journal of Building Struc-tures,1983,4(6):1-17.
[4]余琼,吕西林,陆洲导.框架节点反复荷载下的受力性能研究[J].同济大学学报:自然科学版,2004,32(10):1376-1381.YU Qiong,LU Xi-lin,LU Zhou-dao.Research onframe s joint property under low frequency reversedload[J].Journal of Tongji University:Natural Sci-ence,2004,32(10):1376-1381.
[5]叶列平,王宇航.中、美规范钢筋混凝土梁斜截面受剪承载力的计算对比[J].建筑科学与工程学报,2008,25(1):88-95.YE Lie-ping,WANG Yu-hang.Calculation and com-parison of shear strength of RC beams between Chi-nese and American codes[J].Journal of Architectureand Civil Engineering,2008,25(1):88-95.
[6]Paulay T.Equilibrium criteria for reinforced concretebeam column joints[J].ACI Structural Journal,1989,86(6):635-643.
[7]Kim J,LaFave J M.Key influence parameters for thejoint shear behavior of reinforced concrete beam-col-umn connections[J].Engineering Structures,2007,29(10):2523-2539.
[8]Pantazopoulou S J,Bonacci J.Consideration of ques-tions about beam-column joints[J].ACI StructuralJournal,1992,89(1):27-36.
[9]吴涛,刘伯权,邢国华,等.RC框架变梁变柱中节点抗裂性能试验[J].长安大学学报:自然科学版,2009,29(4):77-81.WU Tao,LIU Bo-quan,XING Guo-hua,et al.Crackresistance test of interior joints with abrupt reductionin beam and column section in reinforced concreteframe[J].Journal of Chang an University:NaturalScience Edition,2009,29(4):77-81.
[10]陈招平,董平,黄丽婷.高层建筑地震反应的TLD振动控制[J].建筑科学与工程学报,2008,25(1):122-126.CHEN Zhao-ping,DONG Ping,HUANG Li-ting.TLD vibrational controlling for seismic response ofhigh-rise building[J].Journal of Architecture andCivil Engineering,2008,25(1):122-126.
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