基于轴向模态应变能比法的三维桁架结构损伤定位方法  

Damage detection method of a three-dimensional truss structure based on axial modal strain energy ratio

作　　者：冯坤 杨永春[2] 郑轶[3] 

机构地区：[1]中冶东方工程技术有限公司建工所,山东青岛266555 [2]中国海洋大学工程学院,山东青岛266100 [3]山东省科学院海洋仪器仪表研究所,山东青岛266071

出　　处：《振动与冲击》2013年第12期169-173,190,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(40806044);海洋仪器虚拟试验平台关键技术研究

摘　　要：提出了可用于诊断三维桁架结构的损伤指标-轴向模态应变能比法。该指标仅利用结构的前两阶模态参数,无需转动自由度信息。通过四腿导管架海洋平台结构有限元模型,数值模拟不同构件的多种损伤工况对该指标进行验证,最后通过海洋平台物理模型实验对该方法进行了实验验证。验证结果表明该法可有效地诊断三维桁架结构的损伤。An improved damage inspection method based on axial modal strain energy ratio was presented for identifying a crack in a three-dimensional truss structure. The improved method was used to predict the existence and the approximate location of a crack by using only the first two order modal parameters without any rotational DOF degree information. With the finite element model of a jacket platform, several damage cases of its different members were simulated numerically to verify the index of axial modal strain energy ratio. This method was also verified with a physical model test for a jacket platform. The final results showed that the proposed axial modal strain energy ratio method can effectively diagnose three-dimensional truss structure＇s damage.

关 键 词：损伤检测 桁架 轴向模态应变能比 海洋平台结构 

分 类 号：TU378.6[建筑科学—结构工程]