Abstract
A novel damage detection and localisation method, the so-called Deformation Area Difference method for localisation of damages in bridge structures is introduced. The method is based on static load-deflection experiments with the prerequisite of high precise deflection measurement. This study presents the first experiences of applying the DAD method on a real bridge structure. The investigated structure is a prestressed concrete slab bridge with a span of about 27 m, which was built in 2013. The loading on the bridge is applied using six heavy trucks, each weighing up to 32 t. A wide range of the modern measurement technologies were used to achieve high precision measurements of the bridge deflection along the longitudinal axis, namely the photogrammetry using a big size drone, laser scanner, total station, levelling and displacement sensors. The performed load-deflection test was non-destructive since the maximum deformation did not exceed the serviceability limit state. The exercise of the novel damage detection and localisation method on a real structure initiated further optimisation opportunities of the DAD method and the study of its limits. Several boundary conditions and methodical influence factors related to the applicability of the proposed method were analysed, such as impacts of measurement precision, damage degree, the position of damage, and the number of measurement repetitions.
Highlights
Background of theDeformation Area Difference (DAD)-methodThe DAD method investigates the difference in the area between the theoretical curves of the deflection line, the inclination angle and mainly the curvature with their corresponding curves from the experimental measurements
The real deflection measurement is affected by measurement noise which influences the detectable degree of the damage
The current study shows the first time the application of the DAD method on a real bridge structure
Summary
The study aims to develop a method to identify stiffness changes influenced by damages. The known parameters of equation (3) are the curvature as the second derivative of the deflection curve and the bending moment resulting from the experimental load. The challenge is to distinguish the discontinuities in the curvature curve between damage, measurement noise effect and stiffness changes inherent in the cross-section configuration. At this point, the DAD method becomes effective as it provides an alternative possibility to identify damages without using multiple derivations. The DAD method becomes effective as it provides an alternative possibility to identify damages without using multiple derivations It takes into account the measurement noise effect and the stiffness changes resulting from the shape of the structure
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
