摘要
由于土木工程结构的复杂性、传感器测点的有限性以及局部损伤的不敏感性等问题,大型结构的模型修正存在一定困难。针对空间桁架结构,为克服上述问题,对其进行整体和局部的动力测试试验,然后联合实测的结构整体和局部动态信息进行模型修正:首先进行空间桁架整体的动力测试试验,获得反应整体特性的低阶模态;然后为了提高局部杆件的动态特性,在杆件上附加一定质量,获得附加质量后杆件的局部主频率,并在各类杆件中选取一定数目进行动态测试;最后联合所有实测结构整体的低阶模态和杆件的局部主频率,对空间桁架结构进行模型修正。修正后的模态参数与实测模态吻合良好,验证了方法的有效性。
For large structures in civil engineering,due to their complexity,the limitation of the sensors and the insensitivity to the local damage,the model updating is hard to be performed accurately.Aiming at overcoming the above problems,in the model updating of a space truss structure,global and local dynamic tests were carried out,and the measured global and local dynamic information were summed up for the truss model updating.The global test was made to obtain the lower order modes which reflect the global information of the structure;then certain mass was added on the truss element to modify the local dynamic characteristics of truss element.The local primary frequency of the mass added truss was measured and all the experiment data,including lower modes characteristics and local primary frequencies were combined and used for modal updating.The effectiveness and accuracy of the proposed method was verified by examples.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第16期100-105,共6页
Journal of Vibration and Shock
基金
国家重点基础研究发展计划(973计划)(2013CB036305)
国家自然科学基金项目(51108057
51108066
51108060)
中国博士后基金特别资助(2012T50255)
"十二五"国家科技支撑项目(2011BAK02B01
2011BAK02B03)
中央高校基本科研业务费专项基金资助(DUT13LK13)
关键词
结构健康监测
模型修正
桁架
频率
振型
structure health monitoring
model updating
truss
natural frequency
mode shape
