Abstract
Results of examination and analysis of cracks formation in a composite slab floor in an industrial warehouse hall is presented in the paper. During exploitation of the floor, on which lift trucks and presses worked, a lot of deep cracks occurred in the slab. In order to define characteristics of cracks and properties of concrete there were made different NDT examinations. Measurements of vibrations due to work of presses were also realized with aim to evaluate their possible influence on cracks formation. Static, dynamic and strength structural calculations were also made based on the model of continuous, multi-bay plate. They showed that applied slab reinforcement was sufficient and acting loads did not have to cause cracks. After 3D modelling of the building and taking into consideration the flexibility of main steel beams it was gained that in the RC floor slab over supports bending moments could occur nearly three times greater than calculated from the 2D model. Taking into consideration wrong structural model of the building led to over-loading of the floor slab, its cracking and caused a necessity of its strengthening.
Highlights
Multi-storey warehouse industrial buildings of a light structure with floor systems of reinforced concrete slabs or composite steel/concrete slabs supported by high-span steel floor girders have been engineered and constructed more and more often in recent years (Fig. 1)
Results of the non-destructive analysis of the concrete of deck plate are summarized in Table 1, whereas Table 2 provides the evaluation of the real concrete class according to PN-EN 13791:2008
In order to find out the possible causes of cracks formation due to dynamic influence of presses situated on the floor, the vibrations on the facility were measured for various operating modes of the presses (Fig. 8)
Summary
Multi-storey warehouse industrial buildings of a light structure with floor systems of reinforced concrete slabs or composite steel/concrete slabs supported by high-span steel floor girders have been engineered and constructed more and more often in recent years (Fig. 1). A detailed static analysis, often including non-linear effects, the flexibility of components and their interactive cooperation, and a dynamic analysis due to heavy traffic of transport vehicles, all these need to be considered while designing such hall-type buildings. A lack of such analyses or of calculations taking into account the aforementioned effects may lead to damages in building structure requiring repairs and reinforcement
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