Measuring Dynamic Response of the Wilford Suspension Bridge with a Vision-Based Measurement System

A Case Study

authored by

Rolands Kromanis, Said Elias

Abstract

In this case study the dynamic response of the Wilford suspension bridge is measure using computer vision-based measurement system. The footbridge is subjected to forced excitations, students walking over it, jumping at certain part of it. A modified GoPro action camera with zoom lens is placed approximately 70 m away from the bridge and focused to record videos of multiple targets (hanger to beam connections). Template matching technique is used for the estimation of pixel motions of the targets. Accurate target displacements are derived. They are then used to obtain vibration frequencies and draw the mode shape of the first vertical vibration mode. It is concluded that, although vibration frequencies corresponding to higher vibration modes can be measured, finding the vibration mode shape is difficult with the measurement resolution of 1/10 pixels used in this study.

External Organisation(s)

University of Twente

Type

Conference contribution

Pages

280-289

No. of pages

10

Publication date

2023

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Civil and Structural Engineering

Electronic version(s)

https://doi.org/10.1007/978-3-031-07254-3_28 (Access: Closed)