STRUCTURAL HEALTH MONITORING OF TRUSS BRIDGES BASED ON DAMPING CHANGE IN DIAGONAL MEMBER-COUPLED MODE

Abstract

  This article examined an effectiveness of the Structural Health Monitoring methods based on vibration characteristic changes for steel truss bridges where damage accidents occurred successively. At first, vibration characteristics of the truss bridge are investigated by both theoretical and experimental modal analyses, for paying attention to the coupling of diagonal members in global vibration modes of truss bridges. By using the vibration data of car running test on the truss bridge with the damage in the diagonal member, the possibility of damage detection is next examined based on the change in the damping of diagonal member-coupled mode.