Laser scan point cloud processing for displacement measurements of damaged steel I-girders

Bridge strikes are events where a bridge superstructure is struck from beneath by an over-height vehicle, causing damage to the bridge. When a bridge strike event occurs, bridge owners must assess the damage and decide what, if any, action is required to maintain bridge functionality and safety. There is a growing body of literature exploring terrestrial laser scanning applications for bridge construction, operation, and maintenance. However, only one instance has been found where laser scanning was applied to investigate impact damage for steel I-girder bridges. A new procedure is presented for processing laser scan point cloud data of I-shaped steel bridge girders damaged by impact. The procedure extracts the bottom flange displacements over the length of the damaged girder span by combining existing point cloud processing techniques, including statistical outlier removal, voxelization, cross-sectional slicing, and RANSAC regression. Laser scan data from a damaged steel-girder highway bridge in Mt. Vernon, IL is used as a case study. The measurement procedure is designed to be implemented in real-world practice.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Civil Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2024

Author dc:creator

• Schissler, Lauren Regina

Contributors dc:contributor

• Elbanna, Ahmed E
• Fahnestock, Larry A
• LaFave, James M

• Terrestrial Laser Scan
• Point Cloud
• Steel-girder Bridge
• Over-height Vehicle
• Impact Damage
• Displacement Measurement

Statement dc:rights

• Copyright 2024 Lauren Regina Schissler

Language dc:language

en, eng

Handle dc:identifier

https://hdl.handle.net/2142/124440

OAI record oai:identifier

https://www.ideals.illinois.edu/oai-pmh?verb=GetRecord&metadataPrefix=etdms&identifier=oai%3Awww.ideals.illinois.edu%3A2142%2F124440