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The ambient temperature e ect may result in limitations of vibrationbased structural health monitoring (SHM) approaches for civil engineering structures. This paper addresses the issue of discriminating changes in modal parameters due to damages and changes in modal parameters due to temperature e ects. A n o n parametric damage detection algorithm is proposed, which only assumes that several datasets are recorded on the safe structure at di erent and unknown temperatures, and smoothes out the temperature e ect using an averaging operation. Key