Experimental validation of numerical static calculations for a monolithic rectangular tank with walls of trapezoidal cross-section

Buczkowski, W.; Szymczak-Graczyk, Anna; Walczak, Zbigniew

doi:10.1515/bpasts-2017-0088

Cited by 16 publications

(21 citation statements)

References 2 publications

(2 reference statements)

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“…Many outstanding and fundamental scientific papers on this subject have been created [24][25][26][27][28][29][30][31][32][33][34]. The method has been used in calculations for plate structures [35], tanks [36,37], or surface girders.…”

Section: Static Calculations For the Platementioning

confidence: 99%

Numerical Analysis of the Impact of Thermal Spray Insulation Solutions on Floor Loading

Szymczak-Graczyk

2020

Applied Sciences

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The paper presents the effect of considering the substrate under the floor—insulation in the form of closed-cell polyurethane spray foam, which is used for insulating surfaces particularly exposed to mechanical impact. The layer of thermal insulation was made by spraying, which prevents the occurrence of thermal bridges due to tight filling of the insulated space. It seems extremely important to adopt the appropriate material characteristics of an insulating layer. The basic thermophysical properties of polyurethane foam justifying its choice as an insulation material were the values of its thermal conductivity coefficient (0.022 W/(mK)) and density (36 kg/m3). However, what was the most important for the calculations provided in the work was to determine the stiffness of the foam subgrade so as to assess its impact on the floor load capacity. The paper includes calculations for a floor slab characterized by a static diagram, with all edges free (unfixed), loaded in strips circumferentially. The reinforced concrete slab was 6 × 6 m long, 0.25 m thick, and made of C20/25 concrete resting on an elastic substrate. Calculations were made for two variants taking into consideration two values of subgrade stiffness. The first variant concerned the subgrade stiffness for sprayed polyurethane foam insulation. On the basis of laboratory tests in situ made according to the standard procedure, its average value was assumed as K = 32,000 kN/m3. The second, comparative, computational variant included the subgrade stiffness equal to K = 50,000 kN/m3. A variation approach to the finite difference method was used for static calculations, adopting the condition for the minimum energy of elastic deformation while undergoing bending that was accumulated in the slab resting on a Winkler elastic substrate. Static calculations resulted in obtaining the values of deflections at each point of the discretization grid adopted for the slab. The obtained results have proved the necessity of calculating the floor as a layer element. For the reference substrate with the subgrade stiffness K = 50,000 kN/m3 that was adopted in the work, the value of the bending moment was 17% lower than when taking into account that there was thermal insulation under the floor slab, causing an increase in the deflection of the slab and an increase in its bending moment. If a design does not include the actual subgrade stiffness of the layer under the floor slab, it results in an understatement of the values of the bending moments on the basis of which the slab reinforcement is designed. Adherence of insufficient concrete slab reinforcement may cause subsequent damage to floor slabs.

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Section: Static Calculations For the Platementioning

confidence: 99%

Numerical Analysis of the Impact of Thermal Spray Insulation Solutions on Floor Loading

Szymczak-Graczyk

2020

Applied Sciences

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“…They lead to destruction of concrete surfaces, a reduction in reinforcement diameters, or a reduction in steel profile cross-sections (gross). Structures particularly exposed to corrosion are, i.e., tanks [18,19], silos [20][21][22], bridges, and viaducts. Every structural element is at risk of corrosion: foundations, columns [23], walls [24], floors [25], slabs [26], or beams.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Impact of Omitted Accidental Actions and the Method of Land Use on the Number of Construction Disasters (a Case Study of Poland)

et al. 2021

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As climate changes progress we are dealing with violent and excessive environmental actions. However, the impacts of loads acting on a building object caused by unlikely phenomena such as: fire, explosion, flood, vehicle impact, plane impact, excessive snowfall, and excess wind gusts are still being ignored when analyzing the structure of building objects in the combinatorics of loads. The paper presents a multi-criteria approach to accidental actions and analyzes design situations and load combinations in relation to accidental actions. The existing legal acts were used to define the concept of a construction disaster. The authors verified, on the basis of applicable legal acts and design guidelines, individual analysis strategies for ensuring the safety of building objects and divided them into consequence classes of structural damage. They collected and analyzed the number of construction disasters which occurred in Poland between 1995–2019 (25 years) based on the data from the General Office of Building Control. The number of disasters was divided by voivodeships and causes and supplemented with the data on the number of people injured. The article presents the direction of research development that could be undertaken in order to eliminate future catastrophes caused by the omission of the analysis of the impact of accidental actions at the design stage. Statistical analyses were carried out to show whether land use, population density, and weather factors (wind) affect the number of recorded disasters. It has been shown that regions that have preserved the sustainable development of their territories are less vulnerable to disasters resulting from extreme weather events.

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“…• numerical analysis -test results -thin walled corrugated elements [18]; • numerical analysis -test results -rectangular tank [19] or, in other words: simulation -load capacity [18,19]; • simulation -wave propagation -numerical analysis -scientific tool -diagnosis [20]; • criteria -optimization -energy-efficient building [21].…”

mentioning

confidence: 99%

“…• risk of performance evaluation -the influence of the uncertainty in the assessment of materials properties tested in laboratories [4] and on site [5]; • the building performance: sustainability [6], fire treatment [7,8] and frost durability [9]; • the analytical [10] and numerical [11] models seeking for the technological [11] and construction [10] solution; • seeking for new materials solutions by better understanding of the nature of materials [12], material composition modification [13] and the use of the relatively new mechanism [16,17], prediction methods of the response of an engineering structure to the given loads throughout its service life [18][19][20], even for very sophisticated structures [18][19], to new diagnostic tools [20]. In almost all cases, the leading idea is computer simulation (in virtual laboratory) of the real performance of the subjects.…”

mentioning

confidence: 99%

“…In almost all cases, the leading idea is computer simulation (in virtual laboratory) of the real performance of the subjects. Frequently the subject of the study is the analysis of relations between numerical calculation and lab test results [18][19][20]. This "ongoing section" once again has proved how deeply science and engineering are entangled in civil engineering.…”

mentioning

confidence: 99%

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Civil Engineering – Ongoing Technical Research. Part 2

Czarnecki¹,

Gemert²

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Experimental validation of numerical static calculations for a monolithic rectangular tank with walls of trapezoidal cross-section

Cited by 16 publications

References 2 publications

Numerical Analysis of the Impact of Thermal Spray Insulation Solutions on Floor Loading

Numerical Analysis of the Impact of Thermal Spray Insulation Solutions on Floor Loading

Analysis of the Impact of Omitted Accidental Actions and the Method of Land Use on the Number of Construction Disasters (a Case Study of Poland)

Civil Engineering – Ongoing Technical Research. Part 2

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