张根辈, 臧朝平, 王晓伟, 张璋. 螺栓连接框架结构的有限元模型修正[J]. 工程力学, 2014, 31(4): 26-33. DOI: 10.6052/j.issn.1000-4750.2012.11.0858
引用本文: 张根辈, 臧朝平, 王晓伟, 张璋. 螺栓连接框架结构的有限元模型修正[J]. 工程力学, 2014, 31(4): 26-33. DOI: 10.6052/j.issn.1000-4750.2012.11.0858
ZHANG Gen-bei, ZANG Chao-ping, WANG Xiao-wei, ZHANG Zhang. FINITE ELEMENT MODEL UPDATING OF A FRAMED STRUCTURE WITH BOLTED JOINTS[J]. Engineering Mechanics, 2014, 31(4): 26-33. DOI: 10.6052/j.issn.1000-4750.2012.11.0858
Citation: ZHANG Gen-bei, ZANG Chao-ping, WANG Xiao-wei, ZHANG Zhang. FINITE ELEMENT MODEL UPDATING OF A FRAMED STRUCTURE WITH BOLTED JOINTS[J]. Engineering Mechanics, 2014, 31(4): 26-33. DOI: 10.6052/j.issn.1000-4750.2012.11.0858

螺栓连接框架结构的有限元模型修正

FINITE ELEMENT MODEL UPDATING OF A FRAMED STRUCTURE WITH BOLTED JOINTS

  • 摘要: 综合运用有限元仿真、试验模态测试和模型修正技术,对一个由螺栓连接的三层框架结构进行了动力学特性分析和响应预测,并对其中涉及到的相关问题进行了讨论。首先,采用不同类型单元分别建立结构的实体有限元模型、板-梁有限元模型以及三自由度集中参数模型,并进行模态计算。然后,对实际结构进行模态测试,并将三类模型的计算结果与测试数据进行对比,分析不同类型单元所建立模型的异同以及由螺栓连接的复杂性、加工装配的误差和材料参数的不准确等不确定因素对建模及计算误差所造成的影响,从而确定合理的修正参数。接着,用模态测试数据对模型参数进行修正,使得修正后的模型能够准确反映实际结构的固有频率和振型。最后,将测试获取的阻尼参数加到修正后的模型上,进行冲击激励下的响应预测,并与实际结构的测试结果进行对比,取得了满意的结果。

     

    Abstract: The dynamic characteristic analysis and response prediction of a three-layer framed structure with bolted joints are performed through combined techniques of structural finite element modeling and simulation, as well as modal test and model updating. The related corresponding problems during the process are also discussed. First, three types of models such as a solid finite element model, a plate-beam finite element model and a 3-DOF lumped mass model are constructed respectively and the corresponding normal modes are calculated. Then, modal test is conducted on a practical structure. Afterwards, the models are updated using the tested modal data so that the updated models can represent the dynamic behavior of the practical structure accurately. Finally, a series of shock/free-decay tests are carried out on the structure to validate the model. Results show that the updated models are satisfactory to predict the actual acceleration responses.

     

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