Abstract
This research presents the experimentally measured displacement and strain at specified locations of the concrete of tested annular reinforced concrete slabs subjected to lateral load with three different ratios of inner to outer radii and simply supported at the outer circumference. Performed 3D model of annular RC slabs under the axisymmetric ring load applied, as close as at the inner edge, and investigated their stress-strain state in the elastic stage. This study contains different approaches based on classical thin-plate (CTP) theory and performed a 3D finite-element (FE) model to predict the fields of radial and circumferential stresses and deflection of the slab. Experimentally investigated the crack widths and crack pattern of the two groups of slabs-group A- radially reinforced and group M–orthogonally reinforced. added a correction factor to the CTP equations, which used to determine both radial and circumferential stresses. Also, investigated the appearance of the first cracks, deflection, failure mode, and the maximum value of the failure load for both cases of the reinforcement.
Highlights
The key role of the modern RC buildings is designing the diverse configuration of floor slabs
Results of FE simulation and experimental results have proved that circumferential stresses play the dominant role in the slab's failure under annular loading
The location of these maximum stresses coincided with the ring load location, which is applied 5cm far from the inner edge of the slab
Summary
The key role of the modern RC buildings is designing the diverse configuration of floor slabs. Circular and annular plates are an integral part of many buildings. One of the main tasks of this work is to supply architects to use different configurations of the RC slabs in civil and industrial buildings. If square and rectangular plates have been extensively studied over the past decades, it can be surely asserted that the methods for the analysis of circular and annular slabs are still in the process of improvement Investigation of the out of plane displacement occupied the most extensive aspect of the study of stress-strain state of the annular concrete slab. The other important part of this work was the selection of suitable finite elements, followed by an adequate model, which will be covered all details of the conducted experiment, such as the type of reinforcement, loading, supporting, etc. (Skibeli, 2017; Juárez-Luna & CaballeroGaratachea, 2019; Mohammed, 2019)
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