Method for non-destructive evaluation of load bearing capacity of floor slabs in historical and novel buildings subject to refurbishment using dynamic measurements
If a refurbishment of a building is planned the problem arises, in particular for historical buildings, that structural analysis and constructional drawings are missing. Thus, information about the load bearing capacity and serviceability of the floor slabs is not available. But, if a building is converted whereas the building fabric is maintained the load bearing capacity as well as the serviceability have to be verified.
The objective is to develop an innovative approach applicable in practice which allows to determine the load bearing capacity of floor slabs using dynamic characteristics. Therefore experimental and mathematical methods will be combined.
Basic dynamic properties of the floor slabs, e.g. natural frequencies, eigenforms, damping and magnification factor, are identified. Data thus obtained is used to determine the stiffness and the boundary conditions of the floor slabs. Hence, the residual load bearing capacity can be evaluated using complementary analytical and numerical methods.
The approach will be validated regarding novel floor slabs because structural analysis and constructional drawings are available. Subsequently the method can be applied to determine the load bearing capacity of floor slabs of historical buildings even though detailed information about the construction is missing.
The research project will be realised in cooperation with the engineering company H. Sellmann. It is funded by Deutsche Bundesstiftung Umwelt (DBU).