冻融损伤低矮钢筋混凝土剪力墙恢复力模型研究
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摘要
为研究严寒地区钢筋混凝土剪力墙的力学性能,对经历冻融循环作用的8片低矮钢筋混凝土剪力墙进行了拟静力试验研究。综合考虑冻融循环次数、混凝土抗压强度和轴压比对剪力墙承载力和延性的影响,以动弹性模量定量表征混凝土冻融损伤程度的冻融损伤变量D,建立剪力墙的骨架线特征点荷载(位移)修正系数计算模型。考虑累积损伤效应造成的承载力和刚度退化,引入循环退化指数βi,提出了适用于遭受冻融循环的低矮钢筋混凝土剪力墙的滞回规则,进而建立了考虑冻融循环损伤作用的低矮钢筋混凝土剪力墙恢复力模型。选取4榀经历不同冻融循环次数的低矮钢筋混凝土剪力墙验证该恢复力模型的准确性,计算其滞回曲线和累积滞回耗能值并与试验值进行对比,吻合情况较好。研究所建立的恢复力模型具有较好的精度,可为严寒地区剪力墙结构的弹塑性分析提供理论依据。
In order to study the mechanical properties of RC shear wall in severe cold area,the results of the quasistatic tests of eight RC shear walls under freezing-thawing cycles were analyzed. Considering the impacts of the number of the freezing-thawing cycles,the concrete compressive strength and axial load ratio on the strength and the ductility of squat RC shear walls,the correction coefficient calculation model of characteristic point load( displacement) of the skeleton curve from the freezing-thawing damage members were established with freezing-thawing damage variable D to characterize the damage degree of freezing-thawing damage of concrete. By taking into account the strength and stiffness degradation caused by the cumulative damage effect,a cyclic degradation index βiwas introduced,and then the hysteretic rules and restoring force model applied to squat RC shear wall specimens after freezing-thawing cycles were proposed. For verifying the accuracy of the model,four low RC shear walls subjected different freezing-thawing cycles were selected to calculate their hysteretic curves and cumulative hysteretic energy dissipation,which were compared with the experimental data. The results are in good agreement,which means the restoring force model shows a good precision and can provide a theoretical basis for elasto-plastic analysis of shear wall structures in cold regions.
In order to study the mechanical properties of RC shear wall in severe cold area,the results of the quasistatic tests of eight RC shear walls under freezing-thawing cycles were analyzed. Considering the impacts of the number of the freezing-thawing cycles,the concrete compressive strength and axial load ratio on the strength and the ductility of squat RC shear walls,the correction coefficient calculation model of characteristic point load( displacement) of the skeleton curve from the freezing-thawing damage members were established with freezing-thawing damage variable D to characterize the damage degree of freezing-thawing damage of concrete. By taking into account the strength and stiffness degradation caused by the cumulative damage effect,a cyclic degradation index βiwas introduced,and then the hysteretic rules and restoring force model applied to squat RC shear wall specimens after freezing-thawing cycles were proposed. For verifying the accuracy of the model,four low RC shear walls subjected different freezing-thawing cycles were selected to calculate their hysteretic curves and cumulative hysteretic energy dissipation,which were compared with the experimental data. The results are in good agreement,which means the restoring force model shows a good precision and can provide a theoretical basis for elasto-plastic analysis of shear wall structures in cold regions.
引文
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[16]GULEC C K.Performance-based assessment and design of squat reinforced concrete shear walls[D].New York:State University of New York at Buffalo,2009:179-180.
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[18]PRIESTLEY M J N,KOWALSKY M J.Aspects of drift and ductility capacity of rectangular structural walls[J].Bulletin of the New Zealand Society for Earthquake Engineering,1998,31(2):73-85.
[19]JOHN H,THOMSEN I V,JOHN W W.Displacementbased design of slender reinforced concrete structural walls experimental verification[J].Journal of Structural Engineering,2004,130(3):618-630.
[20]过镇海.钢筋混凝土原理[M].北京:清华大学出版社,2013:160-170.(GUO Zhenhai.Principle of reinforced concrete[M].Beijing:Tsinghua University Press,2013:160-170.(in Chinese))
[21]PARK R,PAULAY T.Reinforced concrete structural[M].New York:John Wiley&Sons,1975:610-620.
[22]IBARRA L F,MEDINA R A,KRAWINKLER H.Hysteretic models that incorporate strength and stiffness deterioration[J].Earthquake Engineering&Structural Dynamics,2005,34(12):1489-1511.
[2]XU S,LI A,JI Z,et al.Seismic performance of reinforced concrete columns after freeze-thaw cycles[J].Construction&Building Materials,2016,102(1):861-871.
[3]郑捷,董立国,秦卿,等.冻融循环下钢筋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,2016,37(10):73-81.(ZHENG Jie,DONG Liguo,QIN Qing,et al.Experimental study on seismic behaviors of RC beam-column joints after freeze-thaw cycles[J].Journal of Building Structures,2016,37(10):73-81.(in Chinese))
[4]YANG W,ZHENG S S,ZHANG D Y,et al.Seismic behaviors of squat reinforced concrete shear walls under freeze-thaw cycles:a pilot experimental study[J].Engineering Structures,2016,124(10):49-63.
[5]SENGUPTA P,LI B.Hysteresis behavior of reinforced concrete walls[J].Journal of Structural Engineering,2014,140(7):1-18.
[6]ZHAO J,DUN H.A restoring force model for steel fiber reinforced concrete shear walls[J].Engineering Structures,2014,75:469-476.
[7]KARSAN I D,JIRSA J O.Behavior of concrete under compressive loading[J].Journal of the Structural Division,1969,95(12):2543-2564.
[8]TAKEDA T.Reinforced concrete response to simulated earthquakes[J].Journal of the Structural Division,1970,96(12):2557-2573.
[9]CLOUGH R W,JOHNSTON S B.Effect of stiffness degradation on earthquake ductility requirements[C]//Proceedings of Japan Earthquake Engineering Symposium.Tokyo,Japan:University of Tokoy Press,1966:227-232.
[10]朱伯龙,张琨联.矩形及环形截面压弯构件恢复力特性的研究[J].同济大学学报,1981,26(2):4-13.(ZHU Bolong,ZHANG Kunlian.A study of restoring force characteristic of reinforced concrete flexural members with a constant axial load[J].Journal of Tongji University,1981,26(2):4-13.(in Chinese))
[11]PARK Y J,ANG H S.Mechanistic seismic damage model for reinforced concrete[J].Journal of Structural Engineering,1985,111(4):722-739.
[12]郑山锁,甘传磊,秦卿,等.冻融循环后一字形短肢剪力墙抗震性能试验研究[J].工程力学,2016,33(12):94-103.(ZHENG Shansuo,GAN Chuanlei,QIN Qing,et al,Experimental study on the seismic behaviors of squat reinforced concrete shear walls under freeze-thaw environment[J]Engineering Mechanics,2016,33(12):94-103.(in Chinese))
[13]WALLACE J W.Modelling issues for tall reinforced concrete core wall buildings[J].The Structural Design of Tall and Special Buildings,2007,16(5):615-632.
[14]臧登科.纤维模型中考虑剪切效应的RC结构非线性特征研究[D].重庆:重庆大学,2008:22-25.(ZANG Dengke.A study on the nonlinear characteristic of RC structure with shear effect in fiber model[D].Chongqing:Chongqing University,2008:22-25.(in Chinese))
[15]张松,吕西林,章红梅.钢筋混凝土剪力墙构件恢复力模型[J].沈阳建筑大学学报(自然科学版),2009,25(4):645-649.(ZHANG Song,LU Xilin,ZHANG Hongmei.Restoring force model of reinforced concrete shear wall components[J].Journal of Shenyang Jianzhu University(Natural Science Edition),2009,25(4):645-649.(in Chinese))
[16]GULEC C K.Performance-based assessment and design of squat reinforced concrete shear walls[D].New York:State University of New York at Buffalo,2009:179-180.
[17]张松,吕西林,章红梅.钢筋混凝土剪力墙构件极限位移的计算方法及试验研究[J].土木工程学报,2009,42(4):10-16.(ZHANG Song,LU Xilin,ZHANG Hongmei.Experimental and analytical studies on the ultimates displacement of RC shear walls[J].China Civil Engineering Journal,2009,42(4):10-16.(in Chinese))
[18]PRIESTLEY M J N,KOWALSKY M J.Aspects of drift and ductility capacity of rectangular structural walls[J].Bulletin of the New Zealand Society for Earthquake Engineering,1998,31(2):73-85.
[19]JOHN H,THOMSEN I V,JOHN W W.Displacementbased design of slender reinforced concrete structural walls experimental verification[J].Journal of Structural Engineering,2004,130(3):618-630.
[20]过镇海.钢筋混凝土原理[M].北京:清华大学出版社,2013:160-170.(GUO Zhenhai.Principle of reinforced concrete[M].Beijing:Tsinghua University Press,2013:160-170.(in Chinese))
[21]PARK R,PAULAY T.Reinforced concrete structural[M].New York:John Wiley&Sons,1975:610-620.
[22]IBARRA L F,MEDINA R A,KRAWINKLER H.Hysteretic models that incorporate strength and stiffness deterioration[J].Earthquake Engineering&Structural Dynamics,2005,34(12):1489-1511.