Structural health monitoring techniques have been utilized to inspect the current conditions of structures, as well as
their post-earthquake performances. The dynamic characteristics of a building, such as modal periods, shapes and damping
ratios can be obtained by analysing the ambient vibration data. It is well-known that dynamic characteristics generated from the
finite element model (FEM) and vibration data, even for the intact building, show remarkable differences. Assumptions made in
the FEM are one of the main reasons for those differences.
