Strain Field Determination Based on Displacement Gradient Model and Unified Least-Squares Technique
Date Issued
2014
Date
2014
Author(s)
Lin, Yi-Chun
Abstract
Deformation analysis is crucial to applications of structural engineering, geodesy and geology, of which the main goal is to detect behaviors of a deformed body. At present most deformation analysis relies on a limited number of high accuracy observations. However, it is insufficient when it comes to describing the strain field on the entire object. Modern techniques, including digital photogrammetry and the Light Detection and Ranging (LiDAR), provide the possibility to obtain a large number of observations in a very efficient manner. These large amount of data can be used to better estimate strain field with appropriate analyzing methods. In this study, a method based on displacement gradient model and unified least-squares is proposed to improve classical deformation analysis; in addition, the corresponding quality assessment and sensitivity analysis are derived accordingly. Furthermore, using a nearest neighboring searching and triangulated irregular network, a strategy for analyzing vast number of observations is established. Numerical experiments based on both simulated and real data suggested that the proposed approach processed large data to detected behaviors of a deformed body in an effective and efficient way.
Subjects
變形分析
應變場
離散點資料
結構物安全監測
Type
thesis
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