A three-stage criterion method for extracting local vibration modes of tensioned cables in beam string structures

As light and efficient large-span space structures, beam string structures have been widely used since the 1980s. Within them, cables are main force-bearing component; their level of tension determines overall stiffness, performance structural safety structures. Real-time monitoring cable force during construction service periods is an important effective measure to ensure structure. At present, vibration method in nearly all common engineering practices for identification/monitoring because its simplicity efficiency. However, segment will be affected by whole structure, so force-frequency relationship based on simple single model cannot meet accuracy requirement identification Therefore, this paper, through finite element simulation theoretical analysis, a three-stage criterion proposed develop new obtaining local modal information tensioned where influence structure considered. The method’s was compared with results obtained according single-cable assumption, design values forces. magnitude error studied provide correction method, that assumption can improve measuring efficiency solution accuracy. numerical show effectiveness method. work paper provides approach improving complex system such as useful discussion systems.