Nonlinear stability analysis of steel cooling towers considering imperfection sensitivity

Wu, Jie; Zhu, Jianyue; Dong, You; Zhang, Qilin

doi:10.1016/j.tws.2019.106448

Cited by 20 publications

(3 citation statements)

References 60 publications

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“…The elasto-plastic buckling behavior under earthquake, dead and wind loads was studied [8][9][10] , and the study found that the forces in members and construction cost are decreased be using the buckling-restrained members. The influence of initial imperfections on the nonlinear stability of SCTs with five structural systems was studied [11,12] , and an imperfection value of H/300 was suggested as the reasonable limit for SCT design.…”

Section: Introductionmentioning

confidence: 99%

Stability Performance and Wind Tunnel Test of Steel Hyperbolic Cooling Tower Considering Skinned Effect

2023

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With the development of industry, cooling towers play a very important role in thermal power generation, and steel cooling towers are being used more widely. The surface of cooling towers is covered with profiled panels, and the skinned effect on the mechanical performance and stability of the structure should be considered. At present, most studies on steel cooling towers have not considered the skinned effect. In steel cooling towers, the skin panels are usually connected to members by self-tapping screws., the shearing test of self-tapping screw connection is carried out considering different screw diameters and plate thicknesses to obtain the shear stiffness of the screws. Then, three FE models of steel hyperbolic cooling towers are established and compared: in Mode–1, the skin panel is not considered; in Model–2, the panel and the member node are rigidly connected; in Model–3, the spring elements are established to simulate the shearing and tension stiffness of self-tapping screws connecting skin panel and members. Based on the finest Model–3, a parametric analysis is done to investigate the effect of the skinned effect on the overall structural stability. Considering different landform types and the roughness of the inner and outer surfaces, a total of 18 measurement conditions are tested in the wind tunnel to study the outer and internal wind pressure coefficients. Furthermore, based on the wind tunnel test, the wind-induced response analysis of steel hyperbolic cooling towers is performed.

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Section: Introductionmentioning

confidence: 99%

Stability Performance and Wind Tunnel Test of Steel Hyperbolic Cooling Tower Considering Skinned Effect

2023

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“…When K is negative, the shell surface adopts an inward form, which is not significantly sensitive to initial imperfections on its surface [24]. Wu [25] has studied negative Gaussian curvature in steel and hyperbolic cooling towers. Their studies report that K equal to zero locates the structure in the interval between sensitive spherical and the insensitive inward shell prone to undergo complex sensitive behaviour related to imperfections [9,10,16,26].…”

Section: Introductionmentioning

confidence: 99%

The Curvature – Energy Relations in Buckling Analysis of Tubular Wind Turbine Towers

Martínez-Vázquez

Baniotopoulos

2022

ce papers

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A former study on wind turbine tower collapse incidences throughout the past 40 years revealed that among the various types the buckling failure was the most catastrophic as led to collapse of tubular tower shell structures. As the modern harvesting of wind energy is usually performed by wind turbine towers being cylindrical shells of thin walls, the need of thorough investigation of the buckling behaviour of shell structures operating under extreme environmental actions is obvious. The present paper addresses such knowledge gap through the study of a series of 100 numerical models underpinned by the well‐established Riks Method for buckling analysis. The method enables the scrutiny of tower shell elements under axial load and bending moment. Within the proposed framework of curvature–energy analysis, the energy stored within an imperfect shell structure is expressed and quantified through cross‐section diaphragms and symbolic lines, covering pre‐buckling, transient stage, and post‐buckling performance close to the bifurcation point. The analysis unveils changes of local surface curvature and energy flows with multiple longitudinal and circumferential wavenumbers taking place during the pre‐buckling process. Wavenumbers and curvature changes induce the energy magnitude jumping over to the adjacent buckling eigenmodes. Furthermore, the mode jumping sees a faster and more convergence result with higher bending moments. The diversity of the final buckling mode largely determined by the variance of shell geometry, compression–bending ratio and boundary conditions.

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“…The term "sensitivity analysis" can be understood differently in civil engineering than in basic sciences, where local and global SA types with random inputs are well established. For example, very specific (non-stochastic) SA methods based on advanced non-linear models are sometimes used for structures susceptible to buckling when the subject of interest is the stability (or potential energy) of structures [35,36] or imperfection sensitivity [37,38], whereby the main objective of these methods is to increase the stability limits of the structures through the variation of suitable design variables. In stochastic systems, stability often means insensitivity or low sensitivity of the output characteristics to the shapes of some input distributions [39].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis in Probabilistic Structural Design: A Comparison of Selected Techniques

Kala

2020

Sustainability

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Although more and more reliability-oriented sensitivity analysis (ROSA) techniques are now available, review and comparison articles of ROSA are absent. In civil engineering, many of the latest indices have never been used to analyse structural reliability for very small failure probability. This article aims to analyse and compare different sensitivity analysis (SA) techniques and discusses their strengths and weaknesses. For this purpose, eight selected sensitivity indices are first described and then applied in two different test cases. Four ROSA type indices are directly oriented on the failure probability or reliability index beta, and four other indices (of a different type) are oriented on the output of the limit state function. The case study and results correspond to cases under common engineering assumptions, where only two independent input variables with Gaussian distribution of the load action and the resistance are applied in the ultimate limit state. The last section of the article is dedicated to the analysis of the different results. Large differences between first-order sensitivity indices and very strong interaction effects obtained from ROSA are observed for very low values of failure probability. The obtained numerical results show that ROSA methods lack a common platform that clearly interprets the relationship of indices to their information value. This paper can help orientate in the selection of which sensitivity measure to use.

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Nonlinear stability analysis of steel cooling towers considering imperfection sensitivity

Cited by 20 publications

References 60 publications

Stability Performance and Wind Tunnel Test of Steel Hyperbolic Cooling Tower Considering Skinned Effect

Stability Performance and Wind Tunnel Test of Steel Hyperbolic Cooling Tower Considering Skinned Effect

The Curvature – Energy Relations in Buckling Analysis of Tubular Wind Turbine Towers

Sensitivity Analysis in Probabilistic Structural Design: A Comparison of Selected Techniques

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