不同轴压比再生混凝土框架节点抗震性能试验研究
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摘要
通过对再生粗骨料取代率为0,50%,100%的再生混凝土框架节点进行不同轴压比低周反复荷载下的抗震性能试验研究,对普通混凝土与再生混凝土节点、再生混凝土节点不同取代率之间、不同轴压比情况下的破坏形态、滞回特性、延性性能、耗能特性等问题进行对比分析。试验结果表明:再生混凝土节点破坏过程均经历了初裂、通裂、极限、破坏四个特征阶段;在滞回曲线形态、节点区变形、构件耗能特性方面,再生混凝土节点与普通混凝土节点表现相似,并没有随着取代率变化而发生规律性变化,但从定量对比分析发现再生混凝土构件劣于后者;轴压比的提高可以在一定程度上提高再生混凝土框架节点的抗剪承载力,但同时也增加了节点的脆性,使得延性降低,变形性能差;再生混凝土节点可以应用于有抗震设防要求地区的结构中,但为避免发生节点核心区剪切破坏,建议采用适当轴压比以及增加核心区的配箍,以提高节点核心区的承载力。
The low-cycle repeated loading tests were carried out for recycled aggregate concrete joints with recycled replace rate 0,50%,100% and different axial compression ratios.The tests were designed to investigate the joint failure modes,hysteretic characteristics,ductility and energy dissipation behavior between the normal concrete joint and recycled aggregate concrete joints with different recycled replace rate.Results show that the mechanical and failure process of recycled concrete frame joints may be composed of four stages: the initial cracking,the thorough cracking,the ultimate stage and the failure stage.It is found that the recycled concrete frame joints are similar to the normal concrete joint in the hysteretic characteristics,joint deformation and energy dissipation behavior,but the recycled concrete joints are inferior to the latter according to the quantitative comparative analysis.The shear capacity of recycled concrete joints may increase with the axial compression ratio,leading to the increased brittle response,decreased ductility,and poor deformation performance.The recycled concrete joints can be applied to the seismic fortification concrete structures,but it is recommended that the appropriate axial compression ratio and the increased stirrup ratio for core area should be adopted to enhance the shear capacity.
The low-cycle repeated loading tests were carried out for recycled aggregate concrete joints with recycled replace rate 0,50%,100% and different axial compression ratios.The tests were designed to investigate the joint failure modes,hysteretic characteristics,ductility and energy dissipation behavior between the normal concrete joint and recycled aggregate concrete joints with different recycled replace rate.Results show that the mechanical and failure process of recycled concrete frame joints may be composed of four stages: the initial cracking,the thorough cracking,the ultimate stage and the failure stage.It is found that the recycled concrete frame joints are similar to the normal concrete joint in the hysteretic characteristics,joint deformation and energy dissipation behavior,but the recycled concrete joints are inferior to the latter according to the quantitative comparative analysis.The shear capacity of recycled concrete joints may increase with the axial compression ratio,leading to the increased brittle response,decreased ductility,and poor deformation performance.The recycled concrete joints can be applied to the seismic fortification concrete structures,but it is recommended that the appropriate axial compression ratio and the increased stirrup ratio for core area should be adopted to enhance the shear capacity.
引文
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[8]郑山锁,曾磊,吕营,等.型钢高强高性能混凝土框架节点抗震性能试验研究[J].建筑结构学报,2008,29(3):128-136(Zheng Shansuo,Zeng Lei,Lu Ying,et al.Experimental research on seismic behavior of steelreinforced high strength and high performance concreteframe joints[J].Journal of Building Structures,2008,29(3):128-136(in Chinese))
[9]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社,1989:23-66
[10]赵国藩.高等钢筋混凝土结构学[M].北京:机械工业出版社,2005:380-413
[2]白国良,刘超,张锋剑.再生混凝土结构基本受力行为研究[R].西安:西安建筑科技大学,2009:7-8
[3]孙跃东,肖建庄,周德源,等.再生混凝土框架抗震性能的试验研究[J].土木工程学报,2006,39(5):9-15(SunYuedong,Xiao Jianzhuang,Zhou Deyuan,et al.Anexperimental study on the seismic behavior of recycledconcrete frames[J].China Civil Engineering Journal,2006,39(5):9-15(in Chinese))
[4]张建伟,曹万林,董宏英,等.再生骨料掺量对中高剪力墙抗震性能影响试验研究[J].土木工程学报,2010,43(增2):55-61(Zhang Jianwei,Cao Wanlin,DongHongying,et al.Experimental study on seismic behavior ofmid-rise recycled concrete shear walls with differentpercentage of aggregate replacement[J].China CivilEngineering Journal,2010,43(S2):55-61(in Chinese))
[5]白国良,刘超,赵洪金,等.再生混凝土框架柱抗震性能试验研究[J].地震工程与工程振动,2011,31(1):61-66(Bai Guoliang,Liu Chao,Zhao Hongjin,et al.Experimental research on seismic behavior of recycledconcrete frame columns[J].Earthquake Engineering andEngineering Vibration,2011,31(1):61-66(in Chinese))
[6]Corinaldesi V,Moriconi G.Behavior of beam-column jointsmade of sustainable concrete under cyclic loading[J].Journal of Materials in Civil Engineering,2006,18(5):650-658
[7]肖建庄,朱晓晖.再生混凝土框架节点抗震性能研究[J].同济大学学报:自然科学版,2005,33(4):47-50(Xiao Jianzhuang,Zhu Xiaohui.Study on seismic behaviorof recycled concrete frame joints[J].Journal of TongjiUniversity:Natural Science Edition,2005,33(4):47-50(in Chinese))
[8]郑山锁,曾磊,吕营,等.型钢高强高性能混凝土框架节点抗震性能试验研究[J].建筑结构学报,2008,29(3):128-136(Zheng Shansuo,Zeng Lei,Lu Ying,et al.Experimental research on seismic behavior of steelreinforced high strength and high performance concreteframe joints[J].Journal of Building Structures,2008,29(3):128-136(in Chinese))
[9]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社,1989:23-66
[10]赵国藩.高等钢筋混凝土结构学[M].北京:机械工业出版社,2005:380-413
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