Evaluation of quasi-static responses using displacement data from a limited number of points on a structure

To maintain structural integrity, an effective method is needed to estimate structural responses using measured displacement data. It is necessary to determine the global displacements of a structure to evaluate its condition. However, fully determining the displacements can be difficult when insufficient measured displacement data are available. In this study, the SRALD 1.0 method is introduced for estimating the internal forces of a structure with limited displacement data. The suggested method involves two stages: deformed shape estimation and structural analysis. In the deformed shape estimation stage, the deformed shape of a structure is estimated using a limited number of displacement data. In the structural analysis stage, internal forces such as bending moments and axial forces are calculated using the estimated deformed shape. To validate SRALD 1.0, numerical analyses of bridges are conducted, and the characteristics of the parameters used in the newly developed method are analyzed. The estimation results are compared with those of conventional interpolation methods. Finally, the validity of SRALD 1.0 is confirmed.