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原文传递 Nondestructive Assessment of Elastomeric Bridge Bearings Using 3D Digital Image Correlation

题名：	Nondestructive Assessment of Elastomeric Bridge Bearings Using 3D Digital Image Correlation
正文语种：	eng
作者：	Soleimani, Saleh Ahmadi;Konstantinidis, Dimitrios;Balomenos, Georgios P.
作者单位：	McMaster Univ Dept Civil Engn 1280 Main St West Hamilton ON L8S 4L8 Canada;Univ Calif Berkeley Dept Civil & Environm Engn Berkeley CA 94720 USA;McMaster Univ Dept Civil Engn 1280 Main St West Hamilton ON L8S 4L8 Canada
关键词：	Elastomeric bridge bearings;Vision-based assessment;Three-dimensional (3D) digital image correlation;Quality control;Experimental testing;Finite-element analysis
摘要：	Elastomeric bridge bearings are installed between the bridge superstructure and substructure to accommodate translational and rotational deformations. The manufacturing quality of elastomeric bridge bearings is of high significance because manufacturing defects (such as variations in rubber layer thickness and nonparallel steel laminates) may jeopardize their short- and long-term structural behavior and integrity. Current quality control procedures involve destructive testing of samples of bearings from a lot. This type of testing is time consuming and costly, and thus limited to a relatively small sample size, which may undermine confidence in the quality of remaining bearings in the lot. This paper presents an alternative, vision-based assessment methodology for the nondestructive identification of the internal structure of elastomeric bridge bearings. The methodology capitalizes on the high deformability of rubber and the near inextensibility of the steel laminates, which together result in a unique deformation pattern on the vertical surfaces of a bearing when it is subjected to axial load. This deformation pattern features local extrema in in-plane strain and horizontal displacement fields on the vertical surfaces. These local extrema are analyzed to deduce the thicknesses of the rubber layers and rubber side covers. The methodology is developed based on three-dimensional finite-element analyses (3D-FEA). Then, three-dimensional digital image correlation (3D-DIC) is used in experimental tests to evaluate its capability to identify manufacturing defects in elastomeric bridge bearings. Finally, the methodology is validated against destructive tests. The nondestructive method presented in this study is conducted in conjunction with compressive tests that departments of transportation carry out routinely and is therefore expected to facilitate rapid and cost-effective qualification of elastomeric bridge bearings.
出版年：	2022
期刊名称：	Journal of structural engineering
卷：	148
期：	1
页码：	04021233.1-04021233.15