基于动力检测数据的重力坝有限元模型修正
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摘要
为建立准确的有限元模型以反映实际结构的力学特性,该文采用ANSYS软件建立了乐昌峡水利枢纽工程的三维有限元分析模型,采用随机子空间法对现场测试的结构响应进行识别,依据识别的频率结果,利用最优化理论对模型的材料参数进行了修正。计算结果表明,修正后结构自振频率相对误差最大为5.06%,修正后的模型动力特性与实测值比较吻合,从而说明修正后的有限元模型的精确性,可以此作为大坝抗震性能分析与评价的基准有限元模型,为工程有效评估安全状况、长期健康监测提供依据。
In order to establish a finite element model to reflect the mechanics properties of practical structural, the 3 D finite element analysis model of Lechang Gorges dam was set up on the ANSYS, SSI method is used to identify the field test results, and the optimization theory was applied to update the material parameters of the initial analysis model based on dynamic testing data. The results show that: The relative error of natural frequency of updataed model is 5.06%. Dynamic characteristics of updated model is accord with the measured values. That means the updated model is closer to practical dam, that can be the baseline finite element model to analyze seismic behavior of the dam, and also provides the basis to evaluate the structures safety and the structures long-term health monitoring.
In order to establish a finite element model to reflect the mechanics properties of practical structural, the 3 D finite element analysis model of Lechang Gorges dam was set up on the ANSYS, SSI method is used to identify the field test results, and the optimization theory was applied to update the material parameters of the initial analysis model based on dynamic testing data. The results show that: The relative error of natural frequency of updataed model is 5.06%. Dynamic characteristics of updated model is accord with the measured values. That means the updated model is closer to practical dam, that can be the baseline finite element model to analyze seismic behavior of the dam, and also provides the basis to evaluate the structures safety and the structures long-term health monitoring.
引文
[1] 张国民,张培震. 我国大陆强震机理与预测研究的主要进展上[J]. 城市防震减灾,1999(6):14-16.
[2] 朱宏平,余璟,张俊兵. 结构损伤动力检测与健康监测研究现状与展望[J]. 工程力学,2011,28(2):1-11,17.
[3] 王博,吕正勋,何伟. 结构动力模型修正方法研究与进展[J]. 水利与建筑工程学报,2009,7(1):16-19.
[4] Baruch M, Itzhack I Y B. Optimal weighted orthogonalization of measured modes[J]. Aiaa Journal, 1978, 17(8): 927-928.
[5] Niordson, Frithiof. On the optimal design of a vibrating beam[J]. Quart.appl.math, 1965, 23(1): 47-53.
[6] 李延强,杜彦良,符强. 基于实测索力的模型斜拉桥有限元模型修正研究[J]. 铁道学报,2013,35(6):91-95.
[7] 何旭辉,余志武,陈政清. 既有铁路钢桁梁桥基准有限元模型建立与验证[J]. 振动与冲击,2007(12):117-121,175.
[8] 秦玉灵,孔宪仁,罗文波. 基于响应面方法的碳纤维蜂窝板有限元模型修正[J]. 振动与冲击,2011,30(7):71-76,86.
[9] 李守巨,刘迎曦,王登刚,等. 岩石和混凝土材料参数识别的修正高斯-牛顿算法[J]. 岩石力学与工程学报,2000(1):93-96.
[10] 冯新,周晶,范颖芳. 基于模态观察的混凝土坝反演分析[J]. 水利学报,2004(2):101-105.
[11] 程琳,王冬冬,杨杰,等. 基于强震观测和多输出支持向量机的混凝土坝材料动参数反演[J]. 振动工程学报,2017,30(3):466-474.
[12] Westergaard H M. Water pressure on dams during earthquakes[J]. Trans Asce, 1933(95):418-433.
[13] 李董辉,童小娇,万中. 数值最优化算法与理论[M]. 北京:科学出版社,2010.
[14] Ren W X,Chen H B. Finite element model updating in structural dynamics by using the response surface method[J]. Engineering Structures,2010,32(8):2 455-2 465.
[15] 宋智,孙强. 基于模型修正的桥梁极限承载力分析[J]. 水利与建筑工程学报,2015,13(5):228-232.
[16] 李国强,李杰. 工程结构动力检测理论与应用[M]. 北京:科学出版社,2002.
[17] Peeters B, Roeck G D, Pollet T, et al. Stochastic subspace techniques applied to parameter identification of civil engineering structures[C]//Proceedings of “New Advances in modal synthesis of large structures: non-linear, damped and non-deterministic cases”, 1995.
[18] 刘数华,方坤河. 碾压混凝土静力抗压弹性模量研究[J].水力发电,2003(9):35-36.
[19] 石妍,方坤河. 碾压混凝土变形特性的研究[J]. 水力发电,2006(7):71-73,82.
[2] 朱宏平,余璟,张俊兵. 结构损伤动力检测与健康监测研究现状与展望[J]. 工程力学,2011,28(2):1-11,17.
[3] 王博,吕正勋,何伟. 结构动力模型修正方法研究与进展[J]. 水利与建筑工程学报,2009,7(1):16-19.
[4] Baruch M, Itzhack I Y B. Optimal weighted orthogonalization of measured modes[J]. Aiaa Journal, 1978, 17(8): 927-928.
[5] Niordson, Frithiof. On the optimal design of a vibrating beam[J]. Quart.appl.math, 1965, 23(1): 47-53.
[6] 李延强,杜彦良,符强. 基于实测索力的模型斜拉桥有限元模型修正研究[J]. 铁道学报,2013,35(6):91-95.
[7] 何旭辉,余志武,陈政清. 既有铁路钢桁梁桥基准有限元模型建立与验证[J]. 振动与冲击,2007(12):117-121,175.
[8] 秦玉灵,孔宪仁,罗文波. 基于响应面方法的碳纤维蜂窝板有限元模型修正[J]. 振动与冲击,2011,30(7):71-76,86.
[9] 李守巨,刘迎曦,王登刚,等. 岩石和混凝土材料参数识别的修正高斯-牛顿算法[J]. 岩石力学与工程学报,2000(1):93-96.
[10] 冯新,周晶,范颖芳. 基于模态观察的混凝土坝反演分析[J]. 水利学报,2004(2):101-105.
[11] 程琳,王冬冬,杨杰,等. 基于强震观测和多输出支持向量机的混凝土坝材料动参数反演[J]. 振动工程学报,2017,30(3):466-474.
[12] Westergaard H M. Water pressure on dams during earthquakes[J]. Trans Asce, 1933(95):418-433.
[13] 李董辉,童小娇,万中. 数值最优化算法与理论[M]. 北京:科学出版社,2010.
[14] Ren W X,Chen H B. Finite element model updating in structural dynamics by using the response surface method[J]. Engineering Structures,2010,32(8):2 455-2 465.
[15] 宋智,孙强. 基于模型修正的桥梁极限承载力分析[J]. 水利与建筑工程学报,2015,13(5):228-232.
[16] 李国强,李杰. 工程结构动力检测理论与应用[M]. 北京:科学出版社,2002.
[17] Peeters B, Roeck G D, Pollet T, et al. Stochastic subspace techniques applied to parameter identification of civil engineering structures[C]//Proceedings of “New Advances in modal synthesis of large structures: non-linear, damped and non-deterministic cases”, 1995.
[18] 刘数华,方坤河. 碾压混凝土静力抗压弹性模量研究[J].水力发电,2003(9):35-36.
[19] 石妍,方坤河. 碾压混凝土变形特性的研究[J]. 水力发电,2006(7):71-73,82.