How Bearing Plate Shape Affects Concrete Strength Under Load
Engineers have long struggled to predict how concrete fails when pressure concentrates on small areas—a critical problem for building foundations, bridge supports, and anchors. New experimental research shows that the shape and size of the steel plate transferring that load dramatically affects concrete's local strength, providing design guidance that could prevent costly structural failures.
Originaltitel: Impact of Bearing Plate Geometry on Local Compressive Strength of Concrete Under Concentric Loading: An Experimental Work
<p>Sometimes only a portion of the surface of a concrete element is loaded, which causes stressconcentration in that region. To safely transfer concentric loads to concrete componentssuch as column bases, short cantilevers, superstructure piers, post-tensioned elements,and support anchors, it is imperative to investigate the local compressive characteristics ofconcrete. To learn more about this subject, further research is required, as there are currentlyinsufficient studies in this field. Therefore, the local compressive behavior of concrete underconcentric stresses is the main focus of this work. Concrete is represented as block sampleswith dimensions of 200 × 200 × 250 mm. A stiff steel plate is used to apply concentricloading on the surface of the samples. The primary parameters are the bearing platedimensions, shape (square, rectangle, and circular with varying areas), and rectangularity. Additionally, the bearing plate’s movement is examined. The stress-slip curves, ultimatebearing strengths, failures, and related slippages of the tested samples are discussed. The findings revealed that the upper surface of the concrete samples exhibited localizeddeterioration beneath the bearing plate. Additionally, the ultimate bearing strength of thesample loaded with the 6 × 6 cm square plate was 163% greater than that of the sampleloaded with the 10 × 10 cm square plate. Furthermore, the sample loaded with the circularplate with a diameter of 4 cm had an ultimate bearing strength that was 181% greater thanthe sample loaded with the circular plate with a diameter of 11 cm. It is clear that thesamples loaded with a circular plate of varying diameters had an ultimate bearing strengththat was 8.5–11% higher than the samples loaded with a square plate of varying lengths.</p>