Buckling of an imperfect spherical shell subjected to external pressure

Ismail, Mohd Shahrom; Mahmud, Jamaluddin; Jailani, Azrol

doi:10.1016/j.oceaneng.2023.114118

Cited by 13 publications

(6 citation statements)

References 36 publications

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“…The present study deals with the evaluation of the buckling capacity of steel spherical shells subjected to external pressure using design codes. Previous studies clearly show that there are discrepancies in the estimation of the buckling strength of steel spherical shells between the industrial design specifications/standards and the experimental results that ranging from 30% to 46% on average, as reported by (Wang, 1967;Ismail, 2023;Cho et al, 2020;Błażejewski and Marcinowski, 2017). Therefore, the purpose of this paper is to discuss and evaluate the uncertainty factors that contribute to the discrepancy in the estimated buckling load of spherical shells in the various design codes.…”

Section: Introductionmentioning

confidence: 90%

Comparative evaluation of design codes for buckling assessment of a steel spherical shell

Ismail¹,

Mahmud

2023

Lat. Am. j. solids struct.

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This work focuses on the comparative evaluation of the buckling capacity of steel spherical shells subjected to external pressure with existing design codes. The recorded experimental data of buckled spherical shells are compared with the calculated buckling pressure using design codes such as (i) European Convention for Constructional Steelwork (ECCS), (ii) Det Norske Veritas (DnV), (iii) British Standard (PD 5500) and (iv) American Bureau of Shipping (ABS). The selected experimental data are widely used in industrial applications. The experimental data are categorised as 'thin-shell', 'moderate-shell' and 'thick-shell' and reviewed against selected design codes. The comparative analysis clearly shows that the DnV design code with a deviation of 3.6% is well suited to estimate the buckling capacity of 'thick shells", while PD 5500 with a deviation of 9% to 50% is better suited for "medium and thin' shells. On the other hand, statistical analysis shows that PD 5500 is close to 1.0 with the value of COV (i.e., 1.281 and 9.383%). Further analysis of 28 steel spherical shell test data is performed and compared with the plotted curves in the format of PD 5500 and ECCS. The result shows that 3 test data are below the lower limit curve specified in the design guideline for ECCS, indicating that PD 5500 is the more conservative design guideline.

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Section: Introductionmentioning

confidence: 90%

Comparative evaluation of design codes for buckling assessment of a steel spherical shell

Ismail¹,

Mahmud

2023

Lat. Am. j. solids struct.

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“…The submarine pressure structures commonly adopt a stiffened cylindrical shell composed of a pressure shell and reinforcement [19]. In addition, the pressure spherical shells have been widely used in underwater vehicles and civil engineering fields [20][21][22]. Therefore, considering the complexity and cost of underwater construction, research on the dynamic response of semi-cylindrical and semi-spherical bottom-sitting RC shell structures subjected to underwater shock waves was conducted.…”

Section: Introductionmentioning

confidence: 99%

Damage Characteristics and Dynamic Response of RC Shells Subjected to Underwater Shock Wave

Lin,

Zhou,

Zhao

et al. 2024

Applied Sciences

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Underwater bottom-sitting shell structures face threats from underwater explosion shock waves. To investigate the damage characteristics and dynamic response of bottom-sitting shell structures under underwater explosion shock waves, three-dimensional numerical models of semi-spherical and semi-cylindrical bottom-sitting reinforced concrete (RC) shells under underwater shock waves were established based on the Arbitrary Lagrangian–Eulerian (ALE) algorithm using LS-DYNA software. The influences of the shock wave transmission medium, explosive equivalent, explosive distance, hydrostatic pressure, and reinforcement on the damage characteristics and dynamic response of semi-spherical and semi-cylindrical bottom-sitting RC shell structures were studied. The results indicated that the damage and center vertical deformation of RC shells under underwater shock waves are significantly greater than those under air shock waves. With an increase in explosive equivalent or decrease in explosive distance, the damage and center vertical deformation of RC shells are increased. The damage to the inner surface of RC shells is more severe than the outer surface. The damage and center vertical deformation of RC shells can be reduced by bottom reinforcement and an increase in the diameter of the steel bar. The ‘hoop effect’ caused by hydrostatic pressure restrains the horizontal convex deformation and slightly decreases the macroscopic damage and vertical center deformation of the semi-spherical RC shell with an increase in hydrostatic pressure within the range of 0–2.0092 MPa. The hydrostatic pressure restrains the horizontal convex deformation of the semi-cylindrical RC shell. However, inward concave deformation of the shell center is increased by hydrostatic pressure, inducing an increase in the damage to and center vertical deformation of the semi-cylindrical RC shell. These findings may offer a reference for the construction and design of protective measures for underwater bottom-sitting shell structures.

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“…Li [10] introduced a finite element calculation method for foundation pit dewatering, resulting in improved accuracy in predicting total water inflow. Ye and Li [11] conducted numerical simulations using Plass3D finite element software, using the Lanzhou deep foundation pit and a large foundation pit as their case studies. Meanwhile, Zhang [12] utilized FLAC3D to perform numerical simulations based on the Jinan Lixia Medical Care Center project, providing valuable theoretical insights into the relationship between foundation pits and subways.…”

Section: Introductionmentioning

confidence: 99%

Displacement analysis and numerical simulation of pile-anchor retaining structure in deep foundation pit

Yin,

2024

J. meas. eng.

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Foundation pit excavation can cause settlement and displacement of surrounding existing buildings and roads. In order to study the influence of soil unloading on the surrounding buildings during pit foundation excavation, the application of a pile-anchor retaining structure in a deep foundation pit was studied, with the deep foundation pit project of Anhui Bright Pearl Mall as the research subject. Through theoretical analysis, field measurements, and FLAC3D numerical simulations, the supporting structure was comprehensively analyzed. A comparison was made between the measured displacement data and the numerical simulation results of the supporting structure and the surrounding environment during the excavation process of the foundation pit. The results indicate that the model results, obtained through the use of the FLAC3D software for numerical simulations, generally align with the field data. This approach can more accurately reflect the evolutionary laws of soil pressure and deformation during the excavation of the foundation pit. The maximum displacement of the horizontal displacement monitoring point in this project's foundation pit is 25.96 mm, which is less than the monitoring alarm value of 30 mm. The horizontal displacement monitoring of the sidewall of the foundation pit is crucial among them. An analysis of the three major causes of numerical deviation provides valuable insights for the design of deep foundation pit supporting structures.

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Buckling of an imperfect spherical shell subjected to external pressure

Cited by 13 publications

References 36 publications

Comparative evaluation of design codes for buckling assessment of a steel spherical shell

Comparative evaluation of design codes for buckling assessment of a steel spherical shell

Damage Characteristics and Dynamic Response of RC Shells Subjected to Underwater Shock Wave

Displacement analysis and numerical simulation of pile-anchor retaining structure in deep foundation pit

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