型钢再生混凝土柱-钢梁组合框架节点抗剪承载力研究
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摘要
为研究型钢再生混凝土柱-钢梁(SRRC柱-S梁)组合框架节点的抗剪承载力,该文对8个组合框架节点试件进行低周反复荷载试验,观察试件破坏过程及破坏形态,获得各加载阶段试件中型钢和钢筋的应变,分析再生粗骨料取代率和轴压比对节点抗剪承载力的影响规律。结果表明:节点抗剪承载力随取代率的增大而降低,但降低幅度不大;适当增大轴压比可以提高节点的抗剪承载力;试件屈服前,节点剪力主要由核心区再生混凝土承担;屈服后型钢腹板和箍筋起主要抗剪作用。在此基础上,分析节点区受力机理,推导型钢腹板、箍筋和再生混凝土各部分抗剪计算方法,最后通过叠加法建立该节点的抗剪承载力公式,计算结果与试验结果吻合较好,研究结果可为型钢再生混凝土柱-钢梁组合框架节点的工程应用提供参考。
In order to study the shear bearing capacity of SRRC column-Steel beam composite frame joints, eight joint specimens were subjected to low cyclic loading tests. The failure process and failure modes of the specimens were observed and the strain of steel and rebars at each loading stage were obtained. The influences of the axial compression ratio and recycled coarse aggregate replacement percentage on the shear bearing capacity of joints were analyzed in detail. The results show that the shear bearing capacity of the joints decreases with the increase of replacement percentage, but the reduced magnitude of shear bearing capacity is relatively small. Appropriate increase of the axial compression ratio can improve the shear bearing capacity of the joints. Before the specimens became yielded, the shearing bearing force was mainly undertaken by the recycled concrete in the core of joints. After being yielded, the shearing bearing force was mainly undertaken by the steel webs and stirrups. Based on the test findings, the failure mechanism of composite frame joints was analyzed, and the expressions of shearing force of steel webs, stirrups and recycled concrete were proposed. Finally, the formula of shear bearing capacity for SRRC columns-Steel beams composite frame joints was established by in term of the superposition method. The calculated results agree well with the test results. The work could be used as a reference for the construction practice of the SRRC columns-Steel beams composite frame joints.
In order to study the shear bearing capacity of SRRC column-Steel beam composite frame joints, eight joint specimens were subjected to low cyclic loading tests. The failure process and failure modes of the specimens were observed and the strain of steel and rebars at each loading stage were obtained. The influences of the axial compression ratio and recycled coarse aggregate replacement percentage on the shear bearing capacity of joints were analyzed in detail. The results show that the shear bearing capacity of the joints decreases with the increase of replacement percentage, but the reduced magnitude of shear bearing capacity is relatively small. Appropriate increase of the axial compression ratio can improve the shear bearing capacity of the joints. Before the specimens became yielded, the shearing bearing force was mainly undertaken by the recycled concrete in the core of joints. After being yielded, the shearing bearing force was mainly undertaken by the steel webs and stirrups. Based on the test findings, the failure mechanism of composite frame joints was analyzed, and the expressions of shearing force of steel webs, stirrups and recycled concrete were proposed. Finally, the formula of shear bearing capacity for SRRC columns-Steel beams composite frame joints was established by in term of the superposition method. The calculated results agree well with the test results. The work could be used as a reference for the construction practice of the SRRC columns-Steel beams composite frame joints.
引文
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[9]Marthong C,Sangma A S,Choudhury S A,et al.Structural behavior of recycled aggregate concrete beam-column connection in presence of micro concrete at joint region[J].Engineering Structures,2017,11(8):243―251.
[10]陈宗平,何天瑀,占东辉.钢筋再生混凝土柱的承压性能及强度计算[J].工程力学,2016,33(10):129―137.Chen Zongping,He Tianyu,Zhan Donghui.Research on bearing capacity and strength calculation of reinforced recycled coarse aggregate concrete columns[J].Engineering Mechanics,2016,33(10):129―137.(in Chinese)
[11]Hui Ma,Jianyang Xue,Yunhe Liu,et al.Cyclic loading tests and shear strength of steel reinforced recycled concrete short columns[J].Engineering Structures,2015,92(6):55―68.
[12]Elnshai A S,Elghazouli A Y.Performance of compositesteel/concrete members under earthquake loading.Part I:analytical model[J].Earthquake Engineering&Structural Dynamics,1993 22(4):315―345.
[13]Vecchio F J,Collins M P.The modified compressionfield theory for reinforced concrete elements subjected to shear[J].ACI Journal,1986,83(2):219―231.
[14]Parra M G,Wight J K.Modeling shears behavior of hybrid RCS beam-column connections[J].Journal of Structural Engineering,2001,127(1):3―11.
[15]贾金青,朱伟庆,王吉忠.型钢超高强混凝土框架中节点抗剪承载力研究[J].土木工程学报,2013,46(10):1―8.Jia Jinqing,Zhu Weiqing,Wang Jizhong.Shear strength of interior steel reinforced high strength concrete beamcolumn joints[J].China Civil Engineering Journal,2013,46(10):1―8.(in Chinese)
[16]赵鸿铁.钢与混凝土组合结构[M].北京:科学出版社,2001:173―174.Zhao Yongtie.Steel and concrete composite structures[M].Beijing:Science Press,2001:173―174.(in Chinese)
[17]Park R,Milburn JR.Comparison of recent New Zealand and United States seismic design provisions for reinforced concrete beam-column joints and test results from four units designed according to the New Zealand Code[J].Bulletin of the New Zealand National Society for Earthquake Engineering,1983,16(1):3―24.
[2]薛建阳,罗峥,元成方,等.再生混凝土力学性能及耐久性能试验研究[J].工业建筑,2010,2(10):91―96.Xue Jianyang,Luo Zheng,Yuan Chengfang,et al.Study on mechanical properties and durability of recycled concrete[J].Industrial Construction,2010,2(10):91―96.(in Chinese)
[3]Zhou Chunheng,Chen Zongping.Mechanical properties of recycled concrete made with different types of coarse aggregate[J].Construction and Building Materials,2017,134(3):497―506.
[4]陈爱玖,章青,王静,等.再生混凝土冻融循环试验与损伤模型研究[J].工程力学,2009,26(11):102―107.Chen Aijiu,Zhang Qing,Wang Jing,et al.Freez-thaw cycle test and a damage mechanics model for recycled concrete[J].Engineering Mechanics,2009,26(11):102―107.(in Chinese)
[5]肖建庄,张凯建,胡博,等.基于可靠度分析的再生混凝土材料分项系数[J].工程力学,2017,34(6):82―91.Xiao Jianzhuang,Zhang Kaijian,Hu Bo,et al.Reliability-based study on partial coefficient of recycled aggregate concrete[J].Engineering Mechanics,2017,34(6):82―91.(in Chinese)
[6]鲍雨泽.型钢再生混凝土框架中节点抗震性能试验研究[D].西安:西安建筑科技大学,2014.Bao Yuze.Experimental research on seismic performance of steel reinforced recycled concrete middle frame joints[D].Xi’an:Xi’an University of Architecture and Technology,2014.(in Chinese)
[7]吴波,赵新宇,杨勇,等.薄壁圆钢管再生混合柱-钢筋混凝土梁节点的抗震试验与数值模拟[J].土木工程学报,2013,46(3):59―69.Wu Bo,Zhao Xinyu,Yang Yong,et al.Seismic test and numerical simulation of with recycled concrete columns with thin walled circular steel tubes-reinforced concrete beams joints[J].China Civil Engineering Journal,2013,46(3):59―69.(in Chinese)
[8]柳炳康,陈丽华,周安,等.再生混凝土框架梁柱中节点抗震性能试验研究[J].建筑结构学报,2011,32(11):109―115.Liu Bingkang,Chen Lihua,Zhou An,et al.Experimental study on seismic behavior of recycled aggregate concrete Beam-column interior joints[J].Journal of Building Structures,2011,32(11):109―115.(in Chinese)
[9]Marthong C,Sangma A S,Choudhury S A,et al.Structural behavior of recycled aggregate concrete beam-column connection in presence of micro concrete at joint region[J].Engineering Structures,2017,11(8):243―251.
[10]陈宗平,何天瑀,占东辉.钢筋再生混凝土柱的承压性能及强度计算[J].工程力学,2016,33(10):129―137.Chen Zongping,He Tianyu,Zhan Donghui.Research on bearing capacity and strength calculation of reinforced recycled coarse aggregate concrete columns[J].Engineering Mechanics,2016,33(10):129―137.(in Chinese)
[11]Hui Ma,Jianyang Xue,Yunhe Liu,et al.Cyclic loading tests and shear strength of steel reinforced recycled concrete short columns[J].Engineering Structures,2015,92(6):55―68.
[12]Elnshai A S,Elghazouli A Y.Performance of compositesteel/concrete members under earthquake loading.Part I:analytical model[J].Earthquake Engineering&Structural Dynamics,1993 22(4):315―345.
[13]Vecchio F J,Collins M P.The modified compressionfield theory for reinforced concrete elements subjected to shear[J].ACI Journal,1986,83(2):219―231.
[14]Parra M G,Wight J K.Modeling shears behavior of hybrid RCS beam-column connections[J].Journal of Structural Engineering,2001,127(1):3―11.
[15]贾金青,朱伟庆,王吉忠.型钢超高强混凝土框架中节点抗剪承载力研究[J].土木工程学报,2013,46(10):1―8.Jia Jinqing,Zhu Weiqing,Wang Jizhong.Shear strength of interior steel reinforced high strength concrete beamcolumn joints[J].China Civil Engineering Journal,2013,46(10):1―8.(in Chinese)
[16]赵鸿铁.钢与混凝土组合结构[M].北京:科学出版社,2001:173―174.Zhao Yongtie.Steel and concrete composite structures[M].Beijing:Science Press,2001:173―174.(in Chinese)
[17]Park R,Milburn JR.Comparison of recent New Zealand and United States seismic design provisions for reinforced concrete beam-column joints and test results from four units designed according to the New Zealand Code[J].Bulletin of the New Zealand National Society for Earthquake Engineering,1983,16(1):3―24.