The Effect of the Continuous-Discrete Soil Base Model on the Stress-Strain State of the Large-Sized Pile-Raft Foundation of a High-Rise Building
DOI:
https://doi.org/10.32347/2410-2547.2025.115.360-374Keywords:
soil base, pile-raft foundation, large-sized, high-rise building, model, elastic, continuous, discrete, combined, stress-strain state, geodetic observationsAbstract
The paper firstly reviews existing approaches to simulating soil bases for large-sized pile-raft foundations of multistory buildings and structures using up-to-date calculation software packages such as SOFiSTiK, ABAQUS, Plaxis, SCAD, LIRA and others when calculating the base-foundation-building system, and points out their shortcomings.Additionally, the paper considers the methodology for improving the soil base model for pile-raft foundations asa method for simulating the soil base of pile foundations, which is patentpending in Ukraine. The main part of the paper is concerned with investigating the effect of the improved linearly deformed (elastic) combined (continuous-discrete) “Layer-Winkler” subsoil model to calculate a large-sized pile-raft foundation of a high-rise building.The combined “Layer-Winkler” model combines the parameters and properties of the two most well-known and widely used models in design calculation such as the model of the continuous layer of finite distribution capability (the “Layer” model) and the discrete model of no distribution capability with vertical braces of finite stiffness under the raft foundation structure (known as the “Winkler” model). The obtained numerical results, their analysis and comparison indicate that the use of the combined “Layer-Winkler” model reduces the reaction forces in the corner and peripheral piles of the foundation compared to the “Layer” model, while the reaction forces in the middle piles appear to be greater than those resulting from the use of the “Winkler” model of no distribution capability.As a result, when using the combined “Layer-Winkler” model, the raft foundation structure takes up the smallest total bending moment in accordance with the proposed method for assessing the stress state of the foundation.Therefore, unlike the conventional “Layer” model, the use of the combined “Layer-Winkler” model in the calculation of large-sized pile-raft foundations may be of practical importance in the rational design of this type of foundation, as reinforcement can be significantly reduced with an appropriate field-based experimental justification.At the current stage of theoretical and experimental research, the improved combined “Layer-Winkler” model(with the corresponding simulation method) is recommended to be used as an alternative soil base model in the calculation of large-sized pile-raft foundations for buildings and structures, which allows for its implementation in the domestic calculation software packages such as SCAD and LIRA.
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