Identifying damage on a bridge using rotation-based Bridge Weigh-In-Motion
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ORIGINAL PAPER
Identifying damage on a bridge using rotation‑based Bridge Weigh‑In‑Motion E. J. OBrien1 · J. M. W. Brownjohn2,3 · D. Hester4 · F. Huseynov5 · M. Casero1 Received: 6 April 2020 / Revised: 2 September 2020 / Accepted: 9 October 2020 © The Author(s) 2020
Abstract Bridge Weigh-in-Motion (B-WIM) systems use the bridge response under a traversing vehicle to estimate its axle weights. The information obtained from B-WIM systems has been used for a wide range of applications such as pre-selection for weight enforcement, traffic management/planning and for bridge and pavement design. However, it is less often used for bridge condition assessment purposes which is the main focus of this study. This paper presents a bridge damage detection concept using information provided by B-WIM systems. However, conventional B-WIM systems use strain measurements which are not sensitive to local damage. In this paper the authors present a B-WIM formulation that uses rotation measurements obtained at the bridge supports. There is a linear relationship between support rotation and axle weight and, unlike strain, rotation is sensitive to damage anywhere in the bridge. Initially, the sensitivity of rotation to damage is investigated using a hypothetical simply supported bridge model. Having seen that rotation is damage-sensitive, the influence of bridge damage on weight predictions is analysed. It is shown that if damage occurs, a rotation-based B-WIM system will continuously overestimate the weight of traversing vehicles. Finally, the statistical repeatability of ambient traffic is studied using real traffic data obtained from a Weigh-in-Motion site in the U.S. under the Federal Highway Administration’s Long-Term Pavement Performance programme and a damage indicator is proposed as the change in the mean weights of ambient traffic data. To test the robustness of the proposed damage detection methodology numerical analysis are carried out on a simply supported bridge model and results are presented within the scope of this study. Keywords Bridge · Damage detection · Rotation · Bridge weigh-in-motion · B-WIM · WIM · Ambient traffic
1 Introduction
* F. Huseynov [email protected] 1
School of Civil Engineering, University College Dublin, Newstead, Belfield, Dublin D04 V1W8, Ireland
2
Vibration Engineering Section, College of Engineering, Mathematics and Physical Sciences, University of Exeter, North Park Road, Exeter EX4 4QF, UK
3
Full Scale Dynamics LTD, Kay Building North Park Road, Exeter EX4 4QF, UK
4
School of Natural and Built Environment, Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, Northern Ireland, UK
5
Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK
While the bridge stock around the world is ageing, freight transport is growing and the demand on transport infrastructure is therefore increasing. Bridges are typically designed to maintain their functionality for 75–100 years of service life. A recent survey of European’s highway infra
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