The hanger tension is crucial in arch bridges and the fundamental frequencies of short hangers are significantly affected by the flexural rigidity. In order to measure the hanger tension considering the flexural rigidity, the Additional Mass Method (AMM) is proposed in this paper. The tension and flexural rigidity can be calculated by the measured frequencies without and with the additional mass. The difficult inverse calculation among the frequency, tension and stiffness is solved by the genetic algorithm (GA). The proposed method is verified against a numerical example and an experimental bridge, and meanwhile its feasibility in simultaneously identifying hanger tension and flexural rigidity is proved.
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