Knowledge of the loads on long-span bridges are important for assessing the dynamic behavior. To reduce the uncertainties in the adopted load models, full-scale studies of existing structures can be performed. Recently developed methods for inverse identification can estimate the unknown forces on a structure from a limited set of dynamic response measurements. In this contribution, a pilot study of full-scale force identification is performed in a practical case study of the Bergsoysund bridge, a floating pontoon bridge with a span of 840 m, that is also instrumented with accelerometers. A state of the art filtering technique is applied to identify the wave forces on the bridge. This article also presents a method for frequency-domain reconstruction of the wave forces, based on a parametric wave field model from measured wave elevation data. The obtained force estimates from the two approaches shows a reasonable agreement. The practical results are reviewed from the viewpoint of this case study and sources of uncertainties are discussed.
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