@article {bnh-6044, title = {Health Assessment of a Pedestrian Bridge Deck using Ground Penetrating Radar}, journal = {Electronic Journal of Structural Engineering}, volume = {18}, year = {2018}, month = {2018}, pages = {30-37}, abstract = {

Scanning concrete structures using ground penetrating radars (GPR) continues to be one of the most efficient methods for defect (i.e. crack, void and delamination) detection within concrete structures as well as detection of reinforcing bars damage due to corrosion. The aim of this study was to assess the structural health of a 45-year old pedestrian bridge deck. To achieve this, a number of experiments using a GPR system were conducted on a strong concrete floor with known construction drawings to detect cover depth and rebar orientations. After validating the GPR results through the experiments, the GPR system was used for nondestructive assessment of the pedestrian bridge deck. From the scanned results, the location and orientation of the reinforcing bar were established. In addition, the diameters of the bars was estimated by measuring the thickness of the hyperbola curves in the B-scans. The scanned output shows no signs of corrosion of reinforcement or damage of concrete in the form of delamination or cracking.

}, keywords = {Bridge, Ground Penetrating Radars, Non-Destructive Techniques, Structural Heath Assessment}, url = {https://www.researchgate.net/profile/Colin_Duffield/publication/326734315_Health_Assessment_of_a_Pedestrian_Bridge_Deck_using_Ground_Penetrating_Radar/links/5b61464baca272a2d678d7d9/Health-Assessment-of-a-Pedestrian-Bridge-Deck-using-Ground-Penetrating-Ra}, author = {Saeed Miramini and Massoud Sofi and Ahmed Aseem and Ali Baluwala and Lihai Zhang and Priyan Mendis and Colin Duffield} } @article {bnh-5164, title = {Detecting structural damage to bridge girders using radar interferometry and computational modelling}, journal = {Structural Control and Health Monitoring}, volume = {24}, year = {2017}, month = {02/2017}, abstract = {

The process for assessing the condition of a bridge involves continuously monitoring changes to the material properties, support conditions, and system connectivity throughout its life cycle. It is known that the structural integrity of bridges can be monitored by measuring their vibration responses. However, the relationship between frequency changes and structural damage is still not fully understood. This study presents a bridge condition assessment framework which integrates computational modelling and noncontact radar sensor techniques (i.e., IBIS-S) to predict changes in the natural frequencies of a bridge girder as a result of a range of parameters that govern its structural performance (e.g., elastomeric bearing stiffness, concrete compressive stiffness, and crack propagation). Using a prestressed concrete bridge in Australia as a case study, the research outcomes suggest that vibration monitoring using IBIS-S is an efficient way for detecting the degradation of elastomeric bearing stiffness and shear crack propagation in the support areas that can significantly affect the overall structural integrity of a bridge structure. However, frequency measurements have limited capability for detecting the decrease in the material properties of a bridge girder.

}, doi = {https://doi.org/10.1002/stc.1985}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/stc.1985}, author = {Maizuar Maizuar and Lihai Zhang and Saeed Miramini and Priyan Mendis and Russell G Thompson} }