Mapping the Structural Frame of a Damaged Reinforced Concrete Building using As-Damaged Scans and As-Built BIM

After an earthquake, Terrestrial Laser Scanning (TLS) can capture point clouds of the damaged state of building facades rapidly, remotely and accurately. A long-term research effort aims to develop applications that can reconstruct ‘as-damaged’ BIM models of reinforced concrete (RC) framed buildings based on ‘as-built’ BIMs and scans of ‘asdamaged’ states. This paper focuses on a crucial step: generating an initial ‘best-guess’ for the new locations of the façade structural elements. The result serves as the seed for a recursive process in which the location and damage to each object is refined in turn. Mapping the ‘as-built’ BIM frame into the ‘as-damaged’ scan is challenging because each element may have different displacement and damage. The algorithm exploits the topology of RC frames to perform initial mapping of the structural grid onto the damaged facade. The approach was tested on a synthetic dataset prepared from a real earthquake-damaged building. Although successful, it has yet to be tested on other damaged buildings.