scholarly journals Analysis of Brace Stiffness Influence on Stability of the Truss

2015 ◽  
Vol 20 (1) ◽  
pp. 97-108 ◽  
Author(s):  
M. Krajewski ◽  
P. Iwicki
Keyword(s):  
Numerical Analysis ◽  
Normal Force ◽  
Limit Load ◽  
Load Bearing Capacity ◽  
Elastic Supports ◽  
Roof Truss ◽  
Eurocode 3 ◽  
Linear Buckling ◽  
Buckling Length ◽  
Linear Buckling Analysis

Abstract The paper is devoted to the numerical and experimental research of stability of a truss with side elastic supports at the top chord. The structure is a model of a real roof truss scaled by factor ¼. The linear buckling analysis and non-linear static analysis were carried out. The buckling length factor for the compressed top chord was calculated and the limit load for the imperfect truss shell model with respect to brace stiffness was obtained. The relation between brace normal force and loading of the truss is presented. The threshold stiffness of braces necessary to obtain the maximum buckling load was found. The truss load bearing capacity obtained from numerical analysis was compared with Eurocode 3 requirements.

scholarly journals Stability and Load Bearing Capacity of a Bars with Built up Cross Section and Elastic Supports / Badania Stateczności I Nosności Prętów Złożonych Z Podporami Sprężystymi

2015 ◽  
Vol 16 (1) ◽  
pp. 95-104
Author(s):  
Marcin Krajewski
Keyword(s):  
Cross Section ◽  
Geometrical Nonlinearity ◽  
Experimental Tests ◽  
Limit Load ◽  
Nonlinear Static Analysis ◽  
Elastic Supports ◽  
Out Of Plane ◽  
Nonlinear Static ◽  
Linear Buckling Analysis ◽  
Made In

Abstract The present paper is devoted to the numerical analysis and experimental tests of compressed bars with built-up cross section which are commonly used as a top chord of the roof trusses. The significant impact on carrying capacity for that kind of elements in case of out-of-plane buckling is appropriate choice of battens which are used to provide interaction between separate members. Linear buckling analysis results and nonlinear static analysis results, with material and geometrical nonlinearity, are presented for the bar with built-up cross section which was used as the top chord of the truss made in reality. Diagonals and verticals which are supports for the top chord between marginal joints were replaced by the elastic supports. The threshold stiffness (minimum stiffness) for the intermediate elastic supports which ensures maximum buckling load was appointed for the beam and shell model of the structure. The magnitude of limit load depended on length of the battens was calculated for models with initial geometric imperfections. The experimental tests results for the axially compressed bars with builtup cross section and elastic support are presented.

Linear Stability Analysis of Space Compressive Structure of the Inverted-V Combinatorial Jib

2012 ◽  
Vol 510 ◽  
pp. 182-190
Author(s):  
Wen Jun Li ◽  
Xiao Lei Xiong ◽  
Xi Wei Dai ◽  
Qi Cai Zhou
Keyword(s):  
Finite Element ◽  
Limit Load ◽  
Shear Angle ◽  
Combinatorial Structure ◽  
Shear Load ◽  
Element Calculation ◽  
Shearing Force ◽  
Linear Buckling ◽  
The Stability ◽  
Linear Buckling Analysis

In order to study the problem of stability-losing load of the super-big crane jib with the inverted-V shape, this paper completed theoretical analysis, simulation and verification. Based on the stability-losing load formula considering shearing-force influence of compressed solid column, the limit load formula of the inverted-V combinatorial jib was obtained. Then, the method of force was applied to getting the shear angle formula of the inverted-V combinatorial jib under unit shear load. After using the proved formulas and software SAP2000 in linear buckling analysis of 28 combinatorial jibs consisting of two kinds of typical-section rods, the results demonstrated that: As for combinatorial structure consisting of cross-shaped web members, the error between results of the proved limit load formula and finite element calculation was within-5% when the aspect ratio of the inverted-V combinatorial jib was above 3.

scholarly journals Non-linear buckling analysis of functionally graded shallow spherical shells

2009 ◽  
Vol 31 (1) ◽  
pp. 17-30 ◽  
Author(s):  
Dao Huy Bich
Keyword(s):  
External Pressure ◽  
Buckling Analysis ◽  
Functionally Graded ◽  
Power Law Distribution ◽  
Governing Equations ◽  
Spherical Shells ◽  
Buckling Loads ◽  
Linear Buckling ◽  
Non Linear ◽  
Linear Buckling Analysis

In the present paper the non-linear buckling analysis of functionally graded spherical shells subjected to external pressure is investigated. The material properties are graded in the thickness direction according to the power-law distribution in terms of volume fractions of the constituents of the material. In the formulation of governing equations geometric non-linearity in all strain-displacement relations of the shell is considered. Using Bubnov-Galerkin's method to solve the problem an approximated analytical expression of non-linear buckling loads of functionally graded spherical shells is obtained, that allows easily to investigate stability behaviors of the shell.

scholarly journals Non-Line Analysis of Stiffness in Compression Conditions

2018 ◽  
Vol 25 (2) ◽  
pp. 100-107
Author(s):  
Maciej Kahsin ◽  
Dawid Stecki
Keyword(s):  
Critical Force ◽  
Experimental Planning ◽  
Surface Method ◽  
Linear Buckling ◽  
Geometric Deviations ◽  
The Difference ◽  
The Impact ◽  
Linear Buckling Analysis ◽  
Simultaneous Influence ◽  
Line Analysis

Abstract The analyzes were aimed at demonstrating the influence of parameters describing the deformation of the structure on the uncertainty of critical force, and the impact of technological imperfections on stress uncertainty in compression conditions. In a linear buckling analysis, the problem is considered only for the initial, permanent state of the stiffness matrix. In the case of demonstrating the influence of initial deformations on the behavior of the structure under load, it is necessary to visualize changes in stiffness over time. To this end, a non-linear MES analysis was carried out, which will take into account local changes in the stiffness of the model through a gradual increase in the load. Thus, the difference in stiffness is taken into account, which in the linear problem is infinite. The analysis was used to examine the local and global sensitivity of the parameters describing: plating thickness as well as deformation caused by the technological process on the stress value reduced by Huber hypothesis, and the value of normal stress. To take into account the influence of non-specified values of the magnitude of geometric deviations, and their simultaneous influence on the range of obtained results, the Experimental Planning Method and the Surface Method of Answers were used.

Linear Buckling Analysis Considering No-compression Property of Metal Grid Shells Stiffened by Tension Braces

2021 ◽  
Vol 62 (3) ◽  
pp. 195-205
Author(s):  
Kenji Yamamoto ◽  
Hayato Utebi
Keyword(s):  
Geometrical Nonlinearity ◽  
Buckling Analysis ◽  
Nonlinear Buckling ◽  
Compression Property ◽  
Buckling Behavior ◽  
Metal Grid ◽  
Linear Buckling ◽  
Nonlinear Buckling Analysis ◽  
Linear Buckling Analysis ◽  
Lattice Shells

In order to analyze the buckling behavior of lattice shells stiffened by cables or slender braces without pre-tension, it is necessary to consider the no-compression property of braces. This paper proposes an innovative method of linear buckling analysis that considers the no-compression property of braces. Moreover, in order to examine the proposed method's validity, its results are compared with the results from a nonlinear buckling analysis with geometrical nonlinearity and material nonlinearity to express the no-compression property of braces. The results show that the proposed method can well-predict the buckling behaviors of lattice shells stiffened by tension braces.

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