RC桥墩残余位移模拟的参数敏感性分析

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摘要为讨论RC桥墩震后残余位移模拟的建模方法，采用OpenSees非线性纤维梁柱单元和零长度转动弹簧单元，建立了桥墩抗震分析模型。以1个足尺RC桥墩振动台试验结果为依据，对桥墩进行动力时程分析和静力滞回性能模拟。结果表明，纤维梁柱单元数量、转动弹簧单元极限滑移量Su、刚度折减系数b、调整纵筋失效循环次数的延性系数Cf和强度降低系数Cd对残余位移模拟的影响不明显。纵筋滞回关系调整参数R0和转动弹簧单元捏缩系数R对残余位移模拟结果影响较大，初步识别结果为15和1.0。考虑混凝土抗拉的Concrete02模型模拟残余位移精度高于Concrete01模型，考虑纵筋的屈曲GA模型模拟的桥墩残余位移明显偏小。

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	赵泰儀1
	孙治国1
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	王东升1
	周英武3

关键词 ：桥梁抗震, 桥墩残余位移, 数值模拟, OpenSees, 参数敏感性分析

Abstract：To investigate the modeling method for post-earthquake residual displacements of reinforced concrete (RC) bridge piers, Piers’ aseismic analysis models were built using nonlinear fiber beam column elements and zero length rotating spring elements of the software OpenSees. A pier’s dynamic time history analysis and static hysteretic performance simulation were done based on shaking table test results of a full-scale RC bridge pier. Results showed that effects of the number of fiber beam column elements, the ultimate slip displacement Su and stiffness reduction coefficient b of rotating spring elements, the ductility constant Cf and strength reduction constant Cd for adjusting longitudinal reinforcements’ cycle number until their failure on the simulated results of pier’s residual displacements are not obvious; effects of the adjusting parameter R0 for the longitudinal reinforcements’ hysteretic performance and the dodecation coefficient R of rotating spring elements on the simulated results of residual displacements are larger, the preliminary identified values for R0 and R are 15 and 1.0, respectively; the concrete02 model considering concrete tension has a higher simulation accuracy for residual displacements than the concrete01 model does, while the pier’s residual displacements simulated with the GA model considering buckling of longitudinal reinforcement are obviously smaller than test data.

Key words： aseismic design of bridges residual displacements of bridge piers numerical simulation OpenSees parametric sensitivity analysis

收稿日期: 2017-04-21 出版日期: 2018-07-28

引用本文:

赵泰儀1，孙治国1,2，王东升1，周英武3. RC桥墩残余位移模拟的参数敏感性分析[J]. 振动与冲击, 2018, 37(15): 251-260.
ZHAO Taiyi1,SUN Zhiguo1,2,WANG Dongsheng1,ZHOU Yingwu3. Parametric sensitivity analysis in simulation of residual displacements for RC bridge piers. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(15): 251-260.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I15/251

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