SYSTEM IDENTIFICATION OF A TRUSS BEAM

Abstract eng:
The article deals with structural health monitoring (SHM) using non-destructive vibration based method. Modal analysis of a truss beam was prepared in software ANSYS 13.0. The steel truss beam was supported as a cantilever for this experimental measurement. Accelerations of the structure were measured at 22 points (12 points in the horizontal direction, 6 points in the vertical direction and 4 points were situated at the mid-span of diagonal members). We also focused on model similarity. We compared natural frequencies, also mode shapes and their mutual compliance. The conformity was good enough in many cases and so the model similarity was high. The damage was investigated at the diagonals, which were fastened by bolts to the other members. Then, the bolts were loosened and the response of the structure to simulated damage was determined. Global mode-shapes were influenced minimally by structural damage of the joint and therefore the damage should be monitored directly at the specific elements. Such monitoring can be applied to monitor real truss bridges, but it requires more sensors and hence higher input cost.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket