多模型结构识别方法及在混凝土连续梁的应用  

Multi-model structural identification method and its application in concrete continuous beam

作　　者：周云[1] 谢利民[1] 蒋运忠[1] 贾凡丁 易伟建[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《地震工程与工程振动》2015年第4期130-138,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51208190);湖南省自然科学基金青年基金项目(12JJ4053);高校博士点基金新教师基金项目(20120161120029);湖南大学青年教师成长计划;湖南省青年骨干教师培养计划

摘　　要：本文介绍了结构识别的基本概念,针对传统的单模型识别忽视模型正确性而片面强调参数识别的精度问题,阐述了多模型结构识别的概念,即利用多个有限元模型来预测结构的测试结果,其研究重点在于如何从众多待选的模型群中,挑选出最符合实际并反映结构特性的模型簇。对一根实验室中的钢筋混凝土连续梁进行了分级静力加载试验,获得各级载荷下结构的位移和应变。对每一级加载后结构进行多参考点脉冲锤击法试验,获得各级损伤工况下的结构模态参数。利用Strand7-Matlab的交互访问技术,针对4个模型碎片进行了灵敏度分析,基于最大熵原理对连续梁进行了参数敏感位置的排序。最后分别运用模态数据进行基于误差界限阈值的多模型甄选研究,通过筛选得到11个候选模型,结果表明候选模型能够进一步用来预测连续梁结构在静载下的性能。In this paper,the concept of structural identification is introduced. Due to traditional single-model structural identification method often neglects building the right model while emphasizing the accuracy of parameter identification,the multi-model structural identification method is introduced. This method is to utilize multiple models to anticipate the measured results,while the key is to select the correct models from the model cluster. A reinforced concrete continuous beam in the lab is loaded gradually,and the displacement and the strain are obtained in each damage case. Multiple reference impact test is conducted to obtain the structural modal parameters in each damage case. Strand7 software is used for finite element（ FE） modeling,and Strand7-Matlab Application Programming Interface（ API） strategy is used for sensitivity analysis of four model fragments. The maximum entropy theory is used for identification of the sequence of the instrumentation location. At last,modal parameter is used for multiple model selection on the basis of error threshold method to generate 11 FE models,and the models in further are verified to anticipate the static performance of the continuous beam.

关 键 词：结构识别 多模型方法 连续梁 最大熵原理 误差阈值 

分 类 号：TU317.1[建筑科学—结构工程] P315.92[天文地球—地震学]