Abstract
Just as other structural elements, ground slabs are an important unit of a building. It is especially true in the case of buildings, such as logistic centres, for which the primary purpose is storage of various goods. In this kind of buildings, floor slabs usually have high loads. For buildings where truck lifts are used, there are special requirements for flatness tolerance across and along the driving track of truck lifts. Therefore, the floor settlement differences in selected distances are limited. In localities where the soils under the floor slab are weak, they should be replaced or compacted. If these solutions are not possible or economically inappropriate, the slabs have to be supported on piles that must be based on strong deep soils. During the design process, it is very important to assign a proper value of rigidity of the piles. Pile stiffness has an enormous influence on the settlement of the slab as well as on the reinforcement intensity of the slab or even on the slab thickness. This paper presents the methodology for the evaluation of pile stiffness. In addition, it provides recommendations for the calculation of the floor slab on the piles. Calculations and obtained results confirmed the importance of certain design stages.
Highlights
When designing a monolithic reinforced concrete plate on the ground, its behaviour is determined by the characteristics of the soil under the plate
The upper base layer is compacted. If these solutions are impossible and economically unfeasible, floor plates can be installed on piles, which transmit the load to deeper soil layers by side friction and base
It is important to conduct a proper assessment of the pile stiffness during the plate design
Summary
When designing a monolithic reinforced concrete plate on the ground, its behaviour is determined by the characteristics of the soil under the plate. If these solutions are impossible and economically unfeasible, floor plates can be installed on piles, which transmit the load to deeper soil layers by side friction and base. It is important to conduct a proper assessment of the pile stiffness during the plate design. In such a task, the accuracy of calculations depends on the accuracy of soil characteristics and the evaluation of the interaction of the piles and pile installation technologies. The objective of the study was to suggest an algorithm to evaluate the stiffness of the pile by calculating deformations and reinforcements of the panels in accordance with regulatory requirements
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