There are numerous studies in the c

There are numerous studies in the construction domain that utilized
sensors for various purposes, such as damage detection and material
tracking. For example, structural health monitoring studies used sensors
(e.g., accelerometers, strain gages) to monitor the structural components of buildings [4-7j. The main objective of these studies was to
estimate the behavior of a structural component or a system rather
than to estimate possible blockage in a facility, and in most cases, a single type of sensor was utilized. Other studies that focused on damage
evaluation approaches were mainly targeting regional damage or loss
estimation for building stocks [8,9], Usually satellite images and aerial
photos were utilized in these studies [10,11], Another way of gathering
structural damage information was by monitoring the changes in
the dynamic properties of buildings [12,13], In those studies, accelerometers that were placed at several locations in a building measure the accelerations, which were analyzed to determine the change in building's
natural frequency. This method can detect the change in the overall
stiffness of the building, and thus the damage in structural components.
Neither of these studies, however, focused on determining the amount
of blockage at a certain region or estimating local damages in both structural and non-structura! components. Moreover, data from multiple
types of sensors were not fused in any of these studies