当前位置: X-MOL 学术Remote Sens. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Identifying Spatial and Temporal Variations in Concrete Bridges with Ground Penetrating Radar Attributes
Remote Sensing ( IF 5 ) Pub Date : 2021-05-09 , DOI: 10.3390/rs13091846
Vivek Kumar , Isabel M. Morris , Santiago A. Lopez , Branko Glisic

Estimating variations in material properties over space and time is essential for the purposes of structural health monitoring (SHM), mandated inspection, and insurance of civil infrastructure. Properties such as compressive strength evolve over time and are reflective of the overall condition of the aging infrastructure. Concrete structures pose an additional challenge due to the inherent spatial variability of material properties over large length scales. In recent years, nondestructive approaches such as rebound hammer and ultrasonic velocity have been used to determine the in situ material properties of concrete with a focus on the compressive strength. However, these methods require personnel expertise, careful data collection, and high investment. This paper presents a novel approach using ground penetrating radar (GPR) to estimate the variability of in situ material properties over time and space for assessment of concrete bridges. The results show that attributes (or features) of the GPR data such as raw average amplitudes can be used to identify differences in compressive strength across the deck of a concrete bridge. Attributes such as instantaneous amplitudes and intensity of reflected waves are useful in predicting the material properties such as compressive strength, porosity, and density. For compressive strength, one alternative approach of the Maturity Index (MI) was used to estimate the present values and compare with GPR estimated values. The results show that GPR attributes could be successfully used for identifying spatial and temporal variation of concrete properties. Finally, discussions are presented regarding their suitability and limitations for field applications.

中文翻译:

利用探地雷达属性识别混凝土桥梁的时空变化

对于结构健康监测(SHM),强制检查和民用基础设施保险,估算随时间和空间变化的材料特性至关重要。诸如抗压强度之类的特性会随着时间的推移而发展,并反映出老化基础设施的整体状况。由于材料特性在大尺度上的固有空间变化性,混凝土结构提出了另一项挑战。近年来,已经采用诸如回弹锤和超声速度之类的无损方法来确定混凝土的原位材料性能,重点是抗压强度。但是,这些方法需要人员专业知识,仔细的数据收集和较高的投资。本文提出了一种新颖的方法,使用探地雷达(GPR)来估计随时间和空间变化的原位材料特性,以评估混凝土桥梁。结果表明,GPR数据的属性(或特征)(例如原始平均振幅)可用于识别混凝土桥梁桥面的抗压强度差异。诸如反射波的瞬时振幅和强度之类的属性可用于预测诸如抗压强度,孔隙率和密度之类的材料特性。对于抗压强度,成熟度指数(MI)的一种替代方法用于估算当前值,并与GPR估算值进行比较。结果表明,GPR属性可以成功地用于识别混凝土性能的时空变化。
更新日期:2021-05-09
down
wechat
bug