Implementation of digital twin technology for bridge inspection using terrestrial laser scanner

Abstract This research aims to determine the type, dimensions (extent and depth), and level of the damage, as well as assess the remaining capacity of the bridge. The bridge, constructed in 1984, underwent Terrestrial Laser Scanning (TLS) for data acquisition, resulting in a precise 3D model. The model is used for bridge inspection, creating as-built drawings, and providing recommendations for bridge repair and maintenance. The inspection conducted is a detailed inspection following Guideline No.01/P/BM/2022 concerning Bridge Inspection. Additionally, the bridge’s remaining capacity value was determined using the rating factor method based on Guideline No. 024/BM/2011 on Determining the Remaining Capacity Value of the Bridge. The inspection reveals the bridge is moderately damaged, requiring monitoring or maintenance. The rating factor values for moment and shear at the edge section are 0.71 and 6.33. Meanwhile, at the mid-section, they are 0.44 and 3.39, which means that the bridge is unsafe against moment due to the maximum live load. The floor slab, with moment and shear rating factors of 0.37 and 0.84, is unsafe against both dead load and traffic load-induced moments and shear. TLS greatly assists the detailed inspection process of the bridge, facilitating inspectors to see the bridge’s visual condition that cannot be observed manually.