A FEM analysis of the settlement of a tall building situated on loess subsoil

Nepelski, Krzysztof

doi:10.1515/eng-2020-0060

Cited by 6 publications

(10 citation statements)

References 7 publications

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“…The author conducted a similar analysis for a tall building in Lublin situated on a foundation slab. With similar calculation assumptions, the obtained calculation results were consistent with the real building settlement measurements [18]. The analysis is difficult to compare with the results of other researchers, because for the loess of the Nałęczów Plateau, such a detailed FEM analysis of the cooperation of the subsoil with the building was not performed.…”

Section: Discussionsupporting

confidence: 73%

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3D FEM Analysis of the Subsoil-Building Interaction

Nepelski

2022

Applied Sciences

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This paper presents the process of advanced numerical analysis of interaction between a building and the subsoil. The analysis covered a wide range of work for both computing and research. As part of the research work, field and laboratory subsoil tests were carried out, as well as geodetic measurements of building settlement and measurements of natural vibrations of an object. The computational work included the analysis of a total of 47 FEM models. The subsoil was described using the Modified Cam-Clay model, with parameters determined using field CPT and SDMT tests, as well as triaxial and edometric laboratory tests. Parts with geodetic benchmarks were separated from the building model, and then multi-variant calculations were made on smaller, partial models with parameters obtained from various methods. Calibration of the main models was performed using 8 partial models for which calculations were carried out in 4–5 variants of parameters. This gave a total of 38 partial models. Then, calculations were carried out on the full model of the building with subsoil. At each stage, the results of vertical displacements were compared to the geodetic values. The measured settlement of the real building in the time from the construction of the underground story to its use for the period of 1 year, was from 2.3 mm to 7.8 mm. The settlement from FEM calculations of small calibration models for the same benchmarks was from 2.0 mm to 9.8 mm with parameters derived from CPT tests and from 1.8 to 7.3 mm for parameters derived from SDMT. For the full building model, settlement from FEM calculations ranged from 2.2 to 8.8 for the variant with a simplified subsoil model, and from 3.7 to 10.5 for the model taking into account the inhomogeneity of the subsoil. As a result, it was found that the displacements from the numerical analysis were convergent with the geodetic values. Detailed numerical analyses also allowed to detect the deviations of the segments from the vertical and to indicate potential damage to the structure. It was also indicated how the work of the subsoil influences the stress distribution in selected structural elements. Behaviour of the subsoil has an impact on the behaviour of the building and its deformations, as well as on the distribution of stresses in the structural elements, and, as a result, on the change in the distribution of internal forces in the structure.

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Section: Discussionsupporting

confidence: 73%

“…apart from the author's publication [18], there are no publications at all about FEM ysis in the loess of the Nałęczów Plateau. Despite a similar genesis (aeolian), so behave in different ways in different parts of the world.…”

Section: Introductionmentioning

confidence: 99%

3D FEM Analysis of the Subsoil-Building Interaction

Nepelski

2022

Applied Sciences

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“…The results presented in the article add new data to the documented knowledge. The results of field studies and guidelines for conducting them on the loess of the Lublin region have been described in publications [23][24][25][26][27], and the data from soundings are the basis for determining soil parameters [17,[28][29][30][31] and engineering calculations [12,32,33]. In the light of the above, linking the numerical results of CPT static sounding to the genesis of loess will bring significant benefits to geotechnicians and engineering geologists in terms of data interpretation.…”

Section: Granular Type Of the Loessmentioning

confidence: 99%

CPT Parameters of Loess Subsoil in Lublin Area

Nepelski

Lal

2021

Applied Sciences

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Loess soils were created by the wind transporting particles with later or in parallel occurred protogenetic, syngenetic and epigenetic processes. As a result, various genetic processes affected loesses strength and deformability characteristics. The aim of the study is to estimate the main CPT parameters of loess subsoil in Lublin area according to divided facies. The subsoil in the area of the Nałęczowski Plateau, where Lublin is located, consists mainly of loess from aeolian and aeolian–diluvial facies, and in the deeper parts—from aeolian–alluvial facies. Most of the results obtained for the aeolian facies at the level of qc in the range from 4.5 to 8.0 MPa indicate that these soils are a good load-bearing substrate for building structures. Cone resistances mostly at the level of 1.5–4.0 MPa for the diluvial and alluvial facies confirm that these facies constitute less favorable foundation conditions. The reduced resistance results mainly from the increased water content in ground pores. It is especially the soils of the diluvial facies that provide unfavorable foundation conditions, as they occur near the surface. Genetic processes are a very important element that should be taken into account in engineering research.

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“…Cooling towers are high-rise and thin reinforced concrete buildings designed in many fields including power plants for their high ability to cool water in closed circuit. Their major function is to remove heat from wastewater and transfer it to the atmosphere via evaporation [3,4]. As a result, these structures are exposed to significant temperature changes.…”

Section: Introductionmentioning

confidence: 99%

Deformation of High Rise Cooling Tower through Projection of Coordinates Resulted from Terrestrial Laser Scanner Observations onto a Vertical Plane

Beshr,

Basha,

El-Madany

et al. 2023

IJGI

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The appearance and development of new construction materials, technology and accurate geodetic instruments have led to the necessity of their inevitable use in the health monitoring, maintenance, and restoration of civil structures and special structures such as high-rise cooling towers. This paper presents an accurate practical and analytical method for determining the structural deformation and axis inclination of high rise cooling towers using terrestrial laser scanner (TLS) observations through the projection of tower surface points coordinates on a vertical plane. Four cooling towers in El-Mahla El-Kubra city, Egypt are observed and studied. Two of them with height 56 m, and the others were 36 m height. The studied four towers have different cross-section diameters along the tower height. Each tower has a cone shape with a curved wall. The equation of the tower wall is determined using TLS observations and least squares adjustment techniques. The equations of cone projection with a curved wall are derived and presented in this paper. From TLS observations, the radii and accuracy of each 2 m tower height are determined with center coordinates, and then the inclination of the tower axis is calculated and drawn. From the results of TLS observations, data processing, and analysis using the suggested techniques, it is deduced that there is a deformation in tower walls with small values. The specified technique for observations collection and TLS data analysis through projection on a vertical plane is significant and valuable for determining the structural deformation of circular high rise buildings and towers. From the results, there are obvious deformation values in some cooling towers, so maintenance work must be included. The towers also must be checked and monitored several times at brief intervals.

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A FEM analysis of the settlement of a tall building situated on loess subsoil

Cited by 6 publications

References 7 publications

3D FEM Analysis of the Subsoil-Building Interaction

3D FEM Analysis of the Subsoil-Building Interaction

CPT Parameters of Loess Subsoil in Lublin Area

Deformation of High Rise Cooling Tower through Projection of Coordinates Resulted from Terrestrial Laser Scanner Observations onto a Vertical Plane

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