摘要
目的 提出一种基于二维离散小波变换的混凝土板单点冲击损伤、裂缝损伤识别方法,用于混凝土板单点冲击损伤和裂缝损伤识定位。方法 采用有限元软件ABAQUS建立四边固定约束条件的混凝土板的三维实体有限元模型,考虑单点冲击损伤、水平带状裂缝和垂直带状裂缝的组合损伤模式,并基于刚度损失建立损伤因子,获取不同损伤模式的混凝土板的振动模态;分别考虑四种工况下混凝土板的位移模态,采用二维离散小波变换分析方法将位移模态进行变换。结果 二维离散小波变换能够识别出单点冲击损伤位置;当带状裂缝损伤处的损伤因子为0.1时,二维离散小波变换能够识别出健康板与损伤板交接位置;对于损伤中心处,则损伤识别能力有所降低,而对于带状裂缝损伤的损伤因子较大时就不会出现这种情况。结论 二维离散小波变换能对混凝土板进行单点冲击损伤、裂缝损伤识别与定位,且损伤识别敏感性较高。
In this paper, a method based on two-dimensional discrete wavelet transform for single and multi-point damage identification of concrete slab is proposed.The finite element software ABAQUS is used to establish the three-dimensional solid finite element model of the concrete slab with four fixed constraints.The combined damage modes of single point, horizontal strip and vertical strip are considered.The damage factor is established based on the stiffness loss, and the vibration modes of concrete slab with different damage modes are obtained.Considering the displacement modes of concrete slab under four working conditions, the displacement modes are transformed by two-dimensional discrete wavelet transform.The two-dimensional discrete wavelet transform is easy to identify single point damage;when the damage factor is small, the two-dimensional discrete wavelet transform has good identification ability for the joint of healthy concrete slab and damaged.when the damage factor is large, this situation will not appear.The two-dimensional discrete wavelet transform can identify and locate the damage of concrete slab with high sensitivity.
作者
齐宝欣
贾家科
孙彤
QI Baoxin;JIA Jiake;SUN Tong(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,China,116024)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第6期1080-1087,共8页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51808355)
辽宁省自然科学基金项目(20181023)
海岸和近海工程国家重点实验室开放基金项目(LP1817)。
关键词
混凝土板
二维离散小波变换
损伤识别
振动模态
数值模拟
concrete slab
2D discrete wavelet transform
damage identification
vibration mode
numerical simulation
