Comparative Study of Modal Strain Energy Based Damage Localization Methods For Three-Dimensional Structure

Modal strain energy based methods for damage detection have been received much attention in recent years. The purpose of this paper is to investigate and compare the effectiveness of a traditional modal strain energy method (Stubbs index) and a recently developed modal strain energy decomposition (MSED) method for damage detection for a three-dimensional frame structure. Damage localization for diagonal braces, horizontal beams under partial degree of freedoms (DoFs) is considered. Several damage scenarios including single damage and multiple damages are simulated. The two damage detection methods are applied to detect the damage(s) for each damage case. Useful results are obtained for both single damage scenarios and multiple damage scenarios, which can be used as a guide for damage detection.