施工缝对框架柱抗震性能影响的试验研究
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摘要
为研究施工缝对钢筋混凝土框架柱抗震性能的影响,对整浇柱和在底部设施工缝的带缝柱两种类型构件进行拟静力试验。通过对比深入分析施工缝对柱端传力机制和破坏机理的影响,并且从耗能、纵筋滑移、应力分布及剪切变形分量所占比重等不同角度分析施工缝对柱子抗震性能的影响。结果表明,同等条件下带缝柱与整浇柱的破坏形态一致,但是裂缝发展过程和破坏机理明显不同;施工缝使破坏区域集中,塑性铰长度减小;施工缝对柱抗震性能的影响程度主要与轴压比和剪跨比有关;混凝土接缝面之间的摩擦力和抗剪能力均与轴向荷载的大小有关;施工缝有割裂力在上下混凝土间的传递和利用缝面摩擦力增大耗能能力两种效应,具体哪种效应起控制作用取决于施工缝面法向应力和切向剪力的相对大小。
In order to study the influence of construction joint on seismic behavior of reinforced concrete(RC) frame columns,a series of cantilever columns were tested under cyclic loading.The damage characteristic,force transfer mechanism,energy dissipation,bar bonding slip,strain distribution and deformation proportion were analyzed based on the experimental study.The results show that the law of crack propagation and damage mechanism are obviously different with or without construction joint.The construction joint may obstruct forces from transferring between abutting sections of members and shorten the length of plastic hinge.Axial compression ratio and shear-span ratio are both main parameters influencing the seismic behavior of columns with construction joint.The shear deformation capacity and friction of joint are related to axial load.Whether construction joint would mitigate or enhance the seismic resistance of the RC frame column via the friction and isolation relies on the specific value of normal stress and shear stress on the joint interfaces in nature.
In order to study the influence of construction joint on seismic behavior of reinforced concrete(RC) frame columns,a series of cantilever columns were tested under cyclic loading.The damage characteristic,force transfer mechanism,energy dissipation,bar bonding slip,strain distribution and deformation proportion were analyzed based on the experimental study.The results show that the law of crack propagation and damage mechanism are obviously different with or without construction joint.The construction joint may obstruct forces from transferring between abutting sections of members and shorten the length of plastic hinge.Axial compression ratio and shear-span ratio are both main parameters influencing the seismic behavior of columns with construction joint.The shear deformation capacity and friction of joint are related to axial load.Whether construction joint would mitigate or enhance the seismic resistance of the RC frame column via the friction and isolation relies on the specific value of normal stress and shear stress on the joint interfaces in nature.
引文
[1]李英民,刘立平.汶川地震建筑震害与思考[M].重庆:重庆大学出版社,2008
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[6]陈远峰,王振波,杨春和.考虑施工缝影响的框架结构抗震性能试验研究[J].工业建筑,2006,36(2):28-30(Chen Yuanfeng,Wang Zhenbo,Yang Chunhe.Experimental study on seismic performance of concreteframe considering the effect of construction joints under lowcycle reversed loading[J].Industrial Construction,2006,36(2):28-30(in Chinese))
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[8]Domingo J C,Chu KH.The moment-curvature relationship ofconcrete members[J].ACI Structural Journal,1986,84(2):191-198
[9]Priestley M J N,Park R.Strength and ductility of concretebridge columns under seismic loading[J].ACI StructuralJournal,1987,84(8):61-76
[10]Esmaeily G A,Xiao Yan.Seismic behavior of bridgecolumns subjected to various loading patterns[R].University of California,Berkeley,PEER Report,2002/15
[11]López-Bátiz.O.Behavior of reinforced concrete framestructures with construction joints under lateral loads[J].Magazine of Concrete Research,1998,50(2):133-145
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[2]李英民,于婧,刘建伟.现浇钢筋混凝土结构中施工缝的模型化研究初探[J].西安建筑科技大学学报:自然科学版,2010,42(2):196-200(Li Yingmin,Yu Jing,Liu Jianwei.Simulative analysis of construction joints onRC structure[J].Journal of Xi′an University ofArchitecture and Technology:Natural Science Edition,2010,42(2):196-200(in Chinese))
[3]Waters T.A study of the tensile strength of concrete acrossconstruction joints[J].Magazine of Concrete Research,1954,6(18):151-153
[4]Monks W L.Treatment of construction joints[J].Concrete,1974,8(2):28-30
[5]魏春明,宋玉普,刘健.现浇钢筋混凝土框架柱施工缝抗震性能试验研究[J].大连理工大学学报,2006,45(4):527-532(Wei Chunming,Song Yupu,Liu Jian.Experimental research on seismic behavior of cast in-siteRC frame columns with construction joint[J].Journal ofDalian University of Technology,2006,45(4):527-532(inChinese))
[6]陈远峰,王振波,杨春和.考虑施工缝影响的框架结构抗震性能试验研究[J].工业建筑,2006,36(2):28-30(Chen Yuanfeng,Wang Zhenbo,Yang Chunhe.Experimental study on seismic performance of concreteframe considering the effect of construction joints under lowcycle reversed loading[J].Industrial Construction,2006,36(2):28-30(in Chinese))
[7]GB 50204—2002混凝土结构工程施工质量验收规范[S].北京:中国建筑工业出版社,2001.(GB 50204—2002 Code for acceptance of constructional quality ofconcrete structures[S].Beijing:China Architecture andBuilding Press,2001(in Chinese))
[8]Domingo J C,Chu KH.The moment-curvature relationship ofconcrete members[J].ACI Structural Journal,1986,84(2):191-198
[9]Priestley M J N,Park R.Strength and ductility of concretebridge columns under seismic loading[J].ACI StructuralJournal,1987,84(8):61-76
[10]Esmaeily G A,Xiao Yan.Seismic behavior of bridgecolumns subjected to various loading patterns[R].University of California,Berkeley,PEER Report,2002/15
[11]López-Bátiz.O.Behavior of reinforced concrete framestructures with construction joints under lateral loads[J].Magazine of Concrete Research,1998,50(2):133-145
[12]Shao-Yeh M M.Experimental and analytical studies onhysteretic behavior of reinforced concrete rectangular andT-beams[R].UCB/EERC-76/2,University of California,1976
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