Abstract
Abstract This paper presents results of modal testing of a unique full-scale 15×15 m floor structure made of in situ cast high-strength concrete (HSC) having strength of at least 115 MPa. In addition, finite element (FE) modelling of this floor, model correlation with experimental results and subsequent ‘manual’ model updating to match correlated pairs of natural frequencies and mode shapes are described. As the concrete floor was tested and updated for both uncracked and uncracked states, the FE model updating provided a valuable insight in the change of floor stiffness between the uncracked and cracked states. It was found that even a heavily cracked HSC floor remains linear and does not have significantly increased damping under low-level excitation. Also, bending of in situ cast HSC columns provided considerable stiffness to the floor even when heavily and visibly cracked. Finally, FE model updating confirmed that dynamic modulus of elasticity of the as-built HSC was about 47 GPa and, therefore, considerably increased compared with normal strength concrete.
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