DAMAGE IDENTIFICATION OF BEAM STRUCTURE USING DYNAMIC MODAL DATA ANALYSIS

• Main Author: (NIM : 25005028), Musbar
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/8756
• Institution: Institut Teknologi Bandung

Abstract: <br /> <br /> <br /> <br /> <br /> This study aims to identify damage of a beam structure using various analytical methods based on dynamic modal data (mode shape and frequency), and to evaluate the effectiveness of the proposed methodologies. Several methods explored in this study are: methods based on changes in mode shapes, frequency, and curvature; flexibility method; methods based on changes in curvature mode shapes; and FRF curvature method. The methods were used to identify damage of a beam structure with damage scenarios as follows: single damage, double damage, and multiple damage. The beam structure was modeled as a Hermitian beam with discretization of 15 elements. Damage simulation was obtained by applying crack or reduced stiffness on a few beam elements. Two types of beam structure models were used in the analysis with different materials and section properties, (a) simply supported concrete beam, and (b) steel beam with fixed end restraints. Finite element method was used for structural analysis and for obtaining mode shapes and frequencies. Methods based on changes in mode shapes, frequency, and curvature; flexibility method; and methods based on changes in curvature mode shapes, were able to identify the location of damage on the beam structure with damage scenarios of up to double damage on beam (a), and single damage on beam (b). however, a specific FRF curvature method, i.e. receptance-energy method, was able to identify damage on multiple locations as well as estimate the damage severity index for both beam structural models.