Investigations of initial imperfections of steel scaffold structures

ce/papers ◽  
2021 ◽  
Vol 4 (2-4) ◽  
pp. 351-357
Author(s):  
Charlotte Mercier ◽  
Abdelouahab Khelil ◽  
Firas Al Mahmoud ◽  
Jean‐Luc Blin‐Lacroix ◽  
Alain Pamies
Keyword(s):  
Initial Imperfections

scholarly journals Postbuckling Analysis Of A Rectangular Plate Loaded In Compression

2015 ◽  
Vol 15 (2) ◽  
Author(s):  
Jozef Havran ◽  
Martin Psotný
Keyword(s):  
Rectangular Plate ◽  
User Program ◽  
Nonlinear Fem ◽  
Buckling Mode ◽  
Energy Principle ◽  
Initial Imperfections ◽  
Potential Energy Principle ◽  
Total Potential ◽  
The Stability ◽  
Minimum Total Potential Energy

Abstract The stability analysis of a thin rectangular plate loaded in compression is presented. The nonlinear FEM equations are derived from the minimum total potential energy principle. The peculiarities of the effects of the initial imperfections are investigated using the user program. Special attention is paid to the influence of imperfections on the post-critical buckling mode. The FEM computer program using a 48 DOF element has been used for analysis. Full Newton-Raphson procedure has been applied.

The Influence of Stochastic Imperfection Field on the Bearing Capacity of Hyperbolic Cooling Towers

2011 ◽  
Vol 374-377 ◽  
pp. 2297-2300
Author(s):  
Hai Zhao ◽  
Ya Zhou Xu ◽  
Guo Liang Bai
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Initial Imperfection ◽  
Orthogonal Basis ◽  
Imperfection Sensitivity ◽  
Stochastic Field ◽  
Buckling Mode ◽  
Material Inhomogeneity ◽  
Initial Imperfections ◽  
Distribution Form

The uncontrollable factors such as construction errors, material inhomogeneity, etc. will inevitably lead to a certain initial imperfections. It is generally known that the stochastic initial imperfection of the structure is an important factor for affecting structural stability and bearing capacity. Since these imperfections are random in nature, this paper proposes the method mainly based on the standard orthogonal basis to expand the stochastic field, taking into account the decomposition of the stochastic initial imperfections related to structures, which is projected in the buckling mode orthogonal basis. In the end, the article by the stability analysis example shows that this method can use less random variables effectively describing the original stochastic imperfection field, and efficiently search for the most unfavorable initial imperfection distribution form in order to ensure the imperfection sensitivity structures have a higher reliability, so it can be applied to large-scale engineering structure stochastic imperfection analysis.

Collapse Reasons Analysis of a Large Steel Silo

2011 ◽  
Vol 368-373 ◽  
pp. 647-650
Author(s):  
Yue Dong Sun ◽  
Yan Pu Wang
Keyword(s):  
Temperature Stress ◽  
Critical Stability ◽  
Initial Imperfections ◽  
Stress Calculation ◽  
Large Steel ◽  
Pressure Calculation ◽  
Horizontal Pressure ◽  
Steel Silos ◽  
Design Factors ◽  
Discharge Method

Through the analysis of the collapse reasons of a large steel silo, results show that the main reasons for causing this accident are the design factors, containing horizontal pressure calculation, loads combination, critical stability stress calculation and so on. Temperature stress, storage mode and discharge method, initial imperfections of steel silos are the subordinate reasons and can not be ignored.

Influence of Transverse Cracks on Ultimate Strength of a Steel Plate Under Compression

2011 ◽  
Author(s):  
Abbas Bayatfar ◽  
Jerome Matagne ◽  
Philippe Rigo
Keyword(s):  
Finite Element ◽  
Ultimate Strength ◽  
Steel Plate ◽  
Transverse Cracks ◽  
Longitudinal Compression ◽  
Initial Imperfections ◽  
Crack Location ◽  
Linear Finite Element ◽  
Newton Raphson ◽  
Raphson Method

This study has been carried out on ultimate compressive strength of a cracked steel plate component, considering the effects of initial imperfections (transverse and longitudinal residual stresses and initial deflection, as well). The main objective of this paper is to numerically investigate the influence of crack location and crack length on ultimate strength of a steel plate under monotonic longitudinal compression. This investigation is performed through non-linear finite element (FE) analysis using ANSYS commercial finite element code in which is employed Newton-Raphson method. The FE results indicate that the length of transverse crack and especially its location can significantly affect the magnitude of ultimate strength where the steel plate is subjected to longitudinal compressive action.

Effect of initial imperfections of struts on the mechanical behavior of tensegrity structures

2019 ◽  
Vol 207 ◽  
pp. 871-876 ◽  
Author(s):  
Jianguo Cai ◽  
Ruiguo Yang ◽  
Xinyu Wang ◽  
Jian Feng
Keyword(s):  
Mechanical Behavior ◽  
Tensegrity Structures ◽  
Initial Imperfections
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