基于优化理论的某钢框架模型修正研究
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摘要
提出一种基于振动测试和优化理论的两阶段模型修正方法。首先对一个3层钢框架进行振动台试验,通过对试验数据的分析,识别出该框架的动力特性(前3阶频率和振型)。随后基于优化理论进行有限元模型修正,先采用零阶方法进行初步修正,缩小搜索范围后采用一阶方法进行精确修正。结果表明,该两阶段模型修正方法简单、有效,可广泛应用于土木工程结构的损伤识别及健康监测。
A two-phase model updating method is introduced,which is based on vibration test and optimization theory. First a shaking table test of a 3-layer steel frame was carried out,dynmaic characteristics(the first three natural frequencies and vibration mode) were identified by analysis of test data. Then finite element model updating was performed based on optimization theory,preliminary updating was performed with zero-order optimization method,after search area was reduced accurate updating was performed with first-order optimization method. The results of updating show that the two-phase updating method is simple and effective,it can be used in the practice of civil engineering structures for damage identification and health monitoring,and the application is significant theoretically and practically.
A two-phase model updating method is introduced,which is based on vibration test and optimization theory. First a shaking table test of a 3-layer steel frame was carried out,dynmaic characteristics(the first three natural frequencies and vibration mode) were identified by analysis of test data. Then finite element model updating was performed based on optimization theory,preliminary updating was performed with zero-order optimization method,after search area was reduced accurate updating was performed with first-order optimization method. The results of updating show that the two-phase updating method is simple and effective,it can be used in the practice of civil engineering structures for damage identification and health monitoring,and the application is significant theoretically and practically.
引文
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[4]朱宏平,徐斌,黄玉盈.结构动力模型修正方法的比较研究及评估[J].力学进展,2002,32(4):513-525.
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[7]宗周红,赖苍林,林友勤,等.大跨度预应力混凝土连续钢构桥的动力特性分析[J].地震工程与工程振动,2004,28(3):98-104.
[8]Chang C C,Chang T Y P,Zhang Q W.Ambient Vibration of Long-Span Cable-Stayed Bridge[J].Journal of Bridge Engi-neering,2001,6(1):46-53.
[2]于阿涛,赵鸣.基于振动的土木工程结构健康监测研究进展[J].福州大学学报:自然科学版,2005,33(增刊):233-239.
[3]李辉,丁桦.结构动力模型修正方法研究进展[J].力学进展,2005,35(2):170-180.
[4]朱宏平,徐斌,黄玉盈.结构动力模型修正方法的比较研究及评估[J].力学进展,2002,32(4):513-525.
[5]Mottershead J E,Friswell ML.Model Updatingin Structural Dynamics[J].Journal of Sound and Vibration,1993,167(2):347-375.
[6]Topole K G,Stubbs N.Nondestructive Damage Evaluation of a Structure from Li mited Modal Parameters[J].Earthquake Engineering and Structural Dynamics,1995,24(11):1427-1436.
[7]宗周红,赖苍林,林友勤,等.大跨度预应力混凝土连续钢构桥的动力特性分析[J].地震工程与工程振动,2004,28(3):98-104.
[8]Chang C C,Chang T Y P,Zhang Q W.Ambient Vibration of Long-Span Cable-Stayed Bridge[J].Journal of Bridge Engi-neering,2001,6(1):46-53.
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