Dynamische Zustandsbewertung einer Verbundbrücke: Beobachtung äußerer und nichtlinearer Einflüsse auf die modalen Eigenschaften

Dynamic Condition Assessment of a Composite Bridge: Investigation of External and Nonlinear Influences on the Modal Properties

Using dynamic investigation methods to assess the state of civil constructions like reinforced and prestressed concrete structures as well as composite structures, changes in boundary conditions and environmental influences play a decisive role. Under laboratory conditions it is possible to control respectively to exclude these influences but it is not always possible to control and to exclude them when testing in-situ. By means of dynamic measurements which are conducted on a composite bridge, possible changes in dynamic properties resulting from changes in the amplitude of the excitation force and resulting from changes in the temperature conditions are demonstrated. The dimension of these changes is compared with changes in modal properties resulting from real structural defects and structural damages.