Investigating the buckling behaviour of single layer dome form of space structures

2009 ◽  
Author(s):  
H Abdolpour ◽  
Z Zamanzadeh ◽  
A Behravesh
Keyword(s):  
Single Layer ◽  
Space Structures

Imperfection Sensitivity Analysis of Double Domes Free Form Space Structures

2015 ◽  
Vol 15 (04) ◽  
pp. 1450067 ◽  
Author(s):  
Mehdi Abbasi Mousavi ◽  
Karim Abedi ◽  
Mohamadreza Chenaghlou
Keyword(s):  
Finite Element ◽  
Limit Equilibrium ◽  
Single Layer ◽  
Initial Imperfection ◽  
Free Form ◽  
Space Structures ◽  
Equilibrium Path ◽  
Imperfection Sensitivity ◽  
Step Method ◽  
Buckling Modes

This paper investigates the effects of applying different buckling modes obtained by linearized eigenvalue buckling analysis as the initial imperfection for double domes free form space structures. Nonlinear elastic–plastic analysis of rigidly jointed single layer double domes are carried out using the finite element method. Having verified the finite element modeling, several different collapse analyses have been undertaken in order to examine the stability behavior of these structures. By using the approximate-perturbed method, the results of the analyses show that in free form double domes, the lowest buckling modes could not be considered as the effective modes to change the bifurcation equilibrium path into the limit equilibrium one. Therefore, the generalized conformable imperfection mode method has been suggested in the present study in order to apply geometric imperfections in free form double domes. Also, one step method has been suggested in order to eliminate 60% of buckling modes, which are nonsensitive, before applying the approximate-perturbed method.

Parameter Analysis on Stability of a Suspendome

2005 ◽  
Vol 20 (2) ◽  
pp. 115-124 ◽  
Author(s):  
Zhi-Hua Chen ◽  
Yang Li
Keyword(s):  
Structural Parameters ◽  
Engineering Application ◽  
Single Layer ◽  
Parameter Analysis ◽  
Space Structures ◽  
Buckling Mode ◽  
Geometric Imperfection ◽  
Stability Performance ◽  
Initial Geometric Imperfection ◽  
The Stability

As a kind of hybrid space structures, the suspendome system increases the stiffness and improves the stability of the original dome system by the appropriate use of prestressing cables. Based on the engineering application of suspendome in Tianbao Center (completed in China, 2002), the present paper concentrates on the stability performance of the suspendome with a span of 35.4m using different structural parameters, including the rise-span ratio, magnitude and level settings of initial prestressing in cables, connection rigidity and boundary support condition. Stability performances including buckling mode, critical loads and sensitivity to initial geometric imperfection are studied in detail, and contrast analyses with the corresponding singly-layer shells are carried out to study the superiorities of the suspendome over the single-layer shell. Some valuable conclusions are drawn for practical design.

scholarly journals Size Effect and Material Property Effect of the Impactor on the Damage Modes of the Single-Layer Kiewitt-8 Reticulated Dome

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Li Lin ◽  
Feng Fan ◽  
XuDong Zhi ◽  
HongFeng Yin
Keyword(s):  
Size Effect ◽  
Material Property ◽  
Single Layer ◽  
Space Structures ◽  
Large Space ◽  
Large Space Structures ◽  
The Subject ◽  
Global Collapse ◽  
The Difference ◽  
The Impact

The dynamic response of large space structures under accidental impact has been the subject of intense research since the occurrence of the 9/11 incident. In the present paper, using the 3D ANSYS/LS-DYNA, size effect and material property effect of the impactor on the damage modes of the single-layer Kiewitt-8 reticulated dome were investigated, respectively, where the impactor was the cylinder and the impact direction was vertical. Firstly, analytical results with the rigid impactor indicated that the impactor size can change the damage mode of the reticulated dome. It was found that the probability happening to the global collapse has an obvious rise with the size increase of the impactor. Furthermore, the deformable impactor was considered to figure out the difference with the rigid impactor; the comparisons indicated that the deformable impactor, which has the same mass and the same striking velocity with the rigid impactor, can contribute to the occurrence of the global collapse at a certain initial striking condition.

Stability Analysis of Single-Layer Barrel Vault Space Structures

2012 ◽  
Vol 27 (4) ◽  
pp. 203-218 ◽  
Author(s):  
M. Mohammadi ◽  
K. Abedi ◽  
N. Taghizadieh
Keyword(s):  
Stability Analysis ◽  
Single Layer ◽  
Space Structures

scholarly journals Damage localization using shape change in uniform load surface for civil large-span space structures

2018 ◽  
Vol 30 (9) ◽  
pp. 1339-1354
Author(s):  
Guirong Yan ◽  
Tiantian Li ◽  
Jianxin Yu ◽  
Ruoqiang Feng ◽  
Xiaoyun Shao
Keyword(s):  
Shape Change ◽  
Single Layer ◽  
Mode Shapes ◽  
Space Structures ◽  
Damage Localization ◽  
Regular Pattern ◽  
Uniform Load ◽  
Structural Shape ◽  
Large Span ◽  
Load Surface

Civil large-span space structures have been widely built for public assembly venues. The failure of this type of structure may endanger the lives of many people. Considering that the member configuration of this type of structure may follow a regular pattern and damage in a local region may destroy the regular pattern, a damage detection approach based on the change in structural shape has been proposed by the present authors. In that approach, to obtain the change in structural shape due to damage, the displacements at joints between members are required to be measured. Since it is difficult to measure displacements on this type of structure in practice, in this study, the authors proposed to use the shape change of the uniform load surface for damage localization. Uniform load surface physically represents the deflection profile of the structure under the assumed uniformly distributed loading and can be calculated from the flexibility matrix constructed from the identified natural frequencies and mode shapes. This approach can locate damage to exact structural members. It will avoid costly and tedious work in measuring displacements. This approach has been numerically validated on single-layer space structures with two different member configurations.

Nonlinear Analysis of Single-Layer Reticulated Spherical Shells Under Static and Dynamic Loads

2004 ◽  
Vol 10 (5) ◽  
pp. 731-754 ◽  
Author(s):  
Q. S. Li ◽  
J. M. Chen
Keyword(s):  
Geometrical Nonlinearity ◽  
Three Dimensional ◽  
Single Layer ◽  
Dynamic Responses ◽  
Space Structures ◽  
Equilibrium Equations ◽  
Tangent Stiffness Matrix ◽  
Nonlinear Equilibrium ◽  
Element Technique ◽  
Updated Lagrangian

A nonlinear finite element technique is developed for analyzing the nonlinear static and dynamic responses as well as the nonlinear stability of single-layer reticulated shells under external loads, in which the nonlinear three-dimensional beam elements are employed. Using the updated Lagrangian formulation, we derive a tangent stiffness matrix of three-dimensional beam element, considering the geometric nonlinearity of the element. Moreover, the modified Newton-Raphson method is employed for the solution of the nonlinear equilibrium equations, and the Newmark-β method is adopted for determining the seismic response of single-layer reticulated shells. An improved arc-length method, in which the current stiffness parameter is used to reflect the nonlinear degree of such space structures, is presented for determining the load increment for the structural stability analysis. In addition, an accurate incremental method is developed for computing the large rotations of the space structures. The developed approach is presented in matrix form, which is particularly convenient for developing a computer program. Numerical examples are presented to illustrate the application of the present method and to investigate the effects of the geometrical nonlinearity of the space structures.

Dynamic Stability Analysis of Single-Layer Lattice Dome Considering Member Imperfections

2014 ◽  
Vol 1044-1045 ◽  
pp. 629-632 ◽  
Author(s):  
Shang Qi Wang ◽  
Jun Lin Wang ◽  
Shu Li Zhao ◽  
Jian Heng Sun
Keyword(s):  
Stability Analysis ◽  
Dynamic Stability ◽  
Three Dimensional ◽  
Single Layer ◽  
Space Structures ◽  
Important Research ◽  
Research Project ◽  
Stability Behavior ◽  
Beam Method ◽  
Geometrical Imperfections

Dynamic stability analysis is a very important research project in the space structures. Up to now, in most researches, the imperfections of members are not included in the dynamic stability analysis for the single-layer lattice domes. In this paper, using multiple-beam method to simulate the initial bending deformation of the members, the dynamic stability behavior of a Kiewitt-8 single-layer lattice dome under three dimensional earthquake actions is analyzed by considering the member imperfections and the initial geometrical imperfections. The influence of member imperfections to the dynamic stability behavior of the structure is investigated.

Crystalline order to a resolution of 4.7 A in the sheath of Methanospirilium hungatii: A cross-beta structure

1984 ◽  
Vol 42 ◽  
pp. 214-215
Author(s):  
Murray Stewart ◽  
T.J. Beveridge ◽  
D. Sprott
Keyword(s):  
Cell Wall ◽  
Single Layer ◽  
Uranyl Acetate ◽  
Optical Diffraction ◽  
Tube Axis ◽  
Basic Subunit ◽  
Beta Structure ◽  
Diffraction Patterns ◽  
Protein Treatment ◽  
General Appearance

The archaebacterium Methanospirillum hungatii has a sheath as part of its cell wall which is composed mainly of protein. Treatment with dithiothreitol or NaOH released the intact sheaths and electron micrographs of this material negatively stained with uranyl acetate showed flattened hollow tubes, about 0.5 μm diameter and several microns long, in which the patterns from the top and bottom were superimposed. Single layers, derived from broken tubes, were also seen and were more simply analysed. Figure 1 shows the general appearance of a single layer. There was a faint axial periodicity at 28.5 A, which was stronger at irregular multiples of 28.5 A (3 and 4 times were most common), and fine striations were also seen at about 3° to the tube axis. Low angle electron diffraction patterns (not shown) and optical diffraction patterns (Fig. 2) from these layers showed a complex meridian (as a result of the irregular nature of the repeat along the tube axis) which showed a clear maximum at 28.5 A, consistent with the basic subunit spacing.

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