钢筋混凝土柱锈蚀及加固后的地震响应
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摘要
在加固锈蚀钢筋混凝土柱低周反复荷载试验的基础上,根据提出的加固锈蚀构件的恢复力模型,对锈蚀钢筋混凝土加固后的结构进行了动力时程分析,研究了地震波、钢筋锈蚀及加固方式、加固材料和加固材料用量对结构抗震性能的影响。研究表明,钢筋混凝土柱锈蚀后,由于钢筋截面面积减小及钢筋与混凝土粘结性能的降低,抗震性能降低,但进行加固后,抗震性能有所恢复,恢复程度不仅与加固形式和加固材料用量有关,还与地面运动的频谱特性有关。
The inelastic seismic response of corroded and strengthened RC structural column,whose restoring force model is established based on experiment,is studied utilizing dynamic time-history procedure,and the influences of the ground motion wave,corrosion amount of reinforcement,materials and patterns used for strengthening on the seismic behavior of the corroded and strengthened column is analyzed.The result shows that the seismic behavior of the corroded column is decayed due to the reduction of cross section areas of reinforcement and the mechanical properties of bond between reinforcement and concrete,and the seismic performance of the column may restore after the corroded column being strengthened,but the increased content depends on pattern and amount of material used for strengthening as well as the spectrum of the ground motion.
The inelastic seismic response of corroded and strengthened RC structural column,whose restoring force model is established based on experiment,is studied utilizing dynamic time-history procedure,and the influences of the ground motion wave,corrosion amount of reinforcement,materials and patterns used for strengthening on the seismic behavior of the corroded and strengthened column is analyzed.The result shows that the seismic behavior of the corroded column is decayed due to the reduction of cross section areas of reinforcement and the mechanical properties of bond between reinforcement and concrete,and the seismic performance of the column may restore after the corroded column being strengthened,but the increased content depends on pattern and amount of material used for strengthening as well as the spectrum of the ground motion.
引文
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[2]贡金鑫,李金波,赵国藩.受腐蚀钢筋混凝土构件的恢复力模型[J].土木工程学报,2005,38(11)Gong Jin-xin,Li Jin-bo,Zhao Guo-fan.Restoring ForceModel of Corroded Reinforced Concrete Elements[J].China Civil Engineering Journal,2005,38(11):38～44(in Chinese)
[3]贡金鑫,仲伟秋,赵国藩.受腐蚀钢筋混凝土偏心受压构件低周反复性能的试验研究[J].建筑结构学报,2004,25(5):92～104Gong Jin-xin,Zhong Wei-qiu,Zhao Guo-fan.Experimental Study on Low-cycle Behavior of CorrodedReinforced Concrete Member under EccentricCompression[J].Journal of Building Structures,2004,25(5):92～104(in Chinese)
[4]李金波,贡金鑫.碳纤维布包裹改善锈蚀钢筋混凝土柱延性试验研究[J].大连理工大学学报,2010,50(2):220～227Li Jin-bo,Gong Jin-xin.Experimental Research onDuctile Behavior of Corroded Reinforced ConcreteColumn Confined with CFRP.Journal of DalianUniversity of Technology.2010,50(2):220～227(inChinese)
[5]Li Jin-bo,Gong Jin-xin,Wang Li-cheng.SeismicBehavior of Corrosion-damaged Reinforced ConcreteColumns Strengthened using Combined Carbon Fiber-Reinforced Polymer and Steel Jacket[J].Constructionand Building Materials,2009,23(7):2653～2663
[6]李金波,贡金鑫,王利欢.增大截面和碳纤维布包裹复合加固锈蚀钢筋混凝土柱的抗震性能研究[J].土木工程学报,2009,42(4):17～26Li Jin-bo,Gong Jin-xin,Wang Li-huan.ExperimentalStudy on Seismic Behavior of Corroded ReinforcedConcrete Columns Strengthened with Concrete Jacket andCFRP.China Civil Engineering Journal,2009,42(4):17～26(in Chinese)
[7]GB50011-2001.建筑抗震设计规范[S]GB 50011-2001,Code for Seismic Design of Building[S](in Chinese)
[8]CECS160:2004.建筑工程抗震性态设计通则[S]CECS 160:2004.General Rule for Performance-BasedSeismic Design of Buildings[S](in Chinese)
[9]张新培.钢筋混凝土抗震结构非线性分析[M].北京:科学出版社,2003Zhang Xin-pei.Nonlinear Seismic Analysis ofReinforced Concrete Structural[M].Beijing:SciencePublishing House,2003(in Chinese)
[10]方自虎,孙璨.钢筋混凝土结构的三维有限元非线性分析[J].计算力学学报,2006,38(11):38～44Fang Zi-hu,Sun Can.Nonlinear Analysis of ReinforcedConcrete Structures with Three-dimension FiniteElements[J].Chinese Journal of ComputationalMechanics,2006,38(11):38～44(in Chinese)
[11]Ganainy H El,El Naggar M H.Seismic Performance ofThree-dimensional Frame Structures with UndergroundStories[J].Soil Dynamics and Earthquake Engineering,2009,29(9):1249～1261
[12]吴云芳.Newmark法在负刚度条件下的收敛性和稳定性[J].重庆建筑大学学报,2001,23(1):21～24Wu Yun-fang.Convergence and Stability of NewmarkMethod in Case of Negative Stiffness[J].Journal ofChongqing Jianzhu University,2001,23(1):21～24(inChinese)
[13]程民宪.负屈服刚度条件下数值积分的收敛性和稳定性[J].力学学报,1988,20(1):31～40Cheng Min-xian.Convergence and Stability of DirectNumerical Integration in Case of Negative-yield-stiffness[J].Chinese Journal of Theoretical and AppliedMechanics,1988,20(1):31～40(in Chinese)
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