Influence Analysis of Joint's Stiffness on Spatial Reticulated Shell

2010 ◽  
Vol 163-167 ◽  
pp. 439-442
Author(s):  
Xing Wang ◽  
Fan Wang
Keyword(s):  
Theoretical Foundation ◽  
Single Layer ◽  
Analysis Model ◽  
Nonlinear Beam ◽  
Stability Behavior ◽  
Large Span ◽  
Whole Process ◽  
Practical Design ◽  
The Stability ◽  
Column Element

Joint’s stiffness has important influence on the stability behavior of large-span spatial reticulated shell. In this paper, the nonlinear beam-column element with end springs is taken as the analysis model of members of single-layer reticulated shell, the whole process of nonlinear stability for single-layer reticulated shell is analyzed with the software ANSYS, the influence of joint’s stiffness on the stability of single-layer reticulated shell is studied. Some important conclusions were obtained, which can provide theoretical foundation for the stability ultimate bearing capacity analysis of large-span spatial reticulated shell considering joint’s stiffness and can be applied on practical design.

Stiffness Analysis of Welded Spherical Joints with Rib Stiffeners

2011 ◽  
Vol 71-78 ◽  
pp. 3756-3759
Author(s):  
Xing Wang ◽  
Fan Wang
Keyword(s):  
Bearing Capacity ◽  
Theoretical Foundation ◽  
Flexural Stiffness ◽  
Spherical Joint ◽  
Stiffness Analysis ◽  
Large Span ◽  
Stability Bearing Capacity ◽  
Practical Design ◽  
The Stability ◽  
Welded Hollow Spherical Joint

Joint’s stiffness has important influence on stability bearing capacity of large-span spatial reticulated shell. The welded hollow spherical joint with rib stiffeners is a type of joint applied widely on large-span spatial reticulated shell. In this paper, the axial flexibility and flexural stiffness of welded hollow spherical joint with different rib stiffeners are analyzed with the FEM software ANSYS, compared with the non-rib hollow spherical joint’s stiffness, then the calculation formulas of the axial flexibility and flexural stiffness under different rib stiffeners are given through regression analysis. Some important conclusions were obtained, which can provide theoretical foundation for the stability bearing capacity analysis considering joint’s stiffness and can be applied on practical design..

Experimental Research on the Stability of Spatial Lattice Shell

2012 ◽  
Vol 204-208 ◽  
pp. 3048-3051
Author(s):  
Gan Tang ◽  
Wei Wei Li ◽  
Lin Feng Yin ◽  
Xiao Ming Guo
Keyword(s):  
Control System ◽  
Data Acquisition ◽  
Experimental Research ◽  
Single Layer ◽  
Data Acquisition System ◽  
Stability Behavior ◽  
Initial Imperfections ◽  
Spatial Lattice ◽  
The Stability ◽  
Lattice Shell

In the interest of an understanding to the imperfection stability behavior, a model of single layer spherical lattice shell was designed. The size and the pattern of initial imperfections were entirely measured. Automatic harmony loading control system and data acquisition system was used. The experiment plan, method and results have provided reference significance for the study on the stability of spatial lattice shell. The experimental results and the results of measured imperfections method were compared and analysed in detail. It is verified that measured imperfections method can accurately take into account of the effect of initial imperfections and it can be used for the supplementary checking computations of some important finished structures.

Simulation Study of the Whole Process of Collapse and Collision of a Large-Span Steel Single-Layer Lattice Structure

2011 ◽  
Vol 308-310 ◽  
pp. 2368-2373
Author(s):  
Dong Ya An ◽  
Cheng Ming Li
Keyword(s):  
Performance Analysis ◽  
Lattice Structure ◽  
Single Layer ◽  
Large Earthquake ◽  
Structural Safety ◽  
The Sun ◽  
Displacement Effect ◽  
Large Span ◽  
Whole Process ◽  
Earthquake Action

The project Expo Axis is one of the landmark buildings of Expo Shanghai 2010, and its structural safety depends largely on the security of the six Sun Valleys, which are the important components of the Expo Axis. The simulation of the whole process of collapse and collision of the sun valley under earthquake action is conducted in this article. In the calculation multiple nonlinear factors are taken into account, such as material nonlinearity, large displacement effect, self-contact collision among the structure members, contact collision between the structure and the ground, etc. Through analyzing the results, a reasonable assessment of the structure of Sun Valley’s performance under the supper-large earthquake is given out. This method can also offer reference to other similar large-span steel single-layer lattice structure’s performance analysis.

Tangent Stiffness Matrix of Single-Layer Reticulated Shell’s Members with Rigid Ends

2012 ◽  
Vol 479-481 ◽  
pp. 1997-2000 ◽  
Author(s):  
Fan Wang ◽  
Xing Wang
Keyword(s):  
Axial Force ◽  
Stiffness Matrix ◽  
Single Layer ◽  
Displacement Function ◽  
Axial Stiffness ◽  
Analysis Model ◽  
Tangent Stiffness ◽  
Tangent Stiffness Matrix ◽  
Non Linear ◽  
Column Element

In the paper, the axial stiffness and bending stiffness of single-layer reticulated shell’s joint are considering together, non-linear beam-column element with rigid springs and rigid ends is taken as the analysis model of members of single-layer reticulated shell, a tangent stiffness matrix of members of single-layer reticulated shell considering joint’s stiffness is derived on the basis of the beam-column theory. In this matrix, not only coupling effects of bending in two axes but also joint’s stiffness and joint’s size are considered, not only the effect of axial force on bending but also the effect of axial force on torsion are considered. All higher order terms in the displacement function are considered. So this matrix is perfect and more precise than the tangent stiffness matrix from C.Oran, and this model can be suited to the non-linear stablity analysis of single-layer reticulated shell.

Reliablity Analysis of Large-Span Undergroud Cavern Stability in Jinchuan Mine

2011 ◽  
Vol 295-297 ◽  
pp. 2137-2142
Author(s):  
Zeng Hui Liu ◽  
Gian Gao ◽  
Feng Guang Xu
Keyword(s):  
Normal Distribution ◽  
Reliability Index ◽  
Limit Equilibrium ◽  
High Stress ◽  
Index Formula ◽  
Standard Normal Distribution ◽  
Normal Distribution Function ◽  
Analysis Model ◽  
Large Span ◽  
The Stability

According to superposition compression arch structure and the interaction mechanical characteristics of cavern rock, based on limit equilibrium theory, set up reliability analysis model of large-span cavern of a high-stress mine. Using FOSM method determines the reliability index of the large-span and high-stress cavern. By the mean and variance calculations of simplistic variations parameters of construction features, geological investigate and rock mechanics of Jinchuan Mine large-span cavern obtains a suitable jinchuan mine's reliability index formula, and calculates the reliability index()of Jinchuan Ⅲ mine crashing cavern, the minimum value of 1.137. On the assumption that random variables of affecting the stability of the crashing cavern obey normal distribution, and the reliability index()and failure probability()have established relationship. According to the standard normal distribution function can be calculated less than the risk probability()of instability of the structure of 5.87%, that is the stability of the cavern is greater than 94.13% reliability to suffice the stability requirements of the cavern.

Elememt Stiffness Matrix of Members of Reticulated Shell with End Springs

2011 ◽  
Vol 94-96 ◽  
pp. 289-292
Author(s):  
Xing Wang
Keyword(s):  
Axial Force ◽  
Stiffness Matrix ◽  
Single Layer ◽  
Displacement Function ◽  
Axial Stiffness ◽  
Analysis Model ◽  
Tangent Stiffness ◽  
Tangent Stiffness Matrix ◽  
Higher Order Terms ◽  
Column Element

In this paper, a tangent stiffness matrix of members with end springs of reticulated shell is derived on the basis of Timoshenko’s beam-column theory. In this matrix, joint’s axial stiffness and bending stiffness are considering together, non-linear beam-column element with end springs and rigid ends is taken as the analysis model of members of reticulated shell. In this matrix, not only coupling effects of bending in two axes but also joint’s stiffness and joint’s size are considered, not only the effect of axial force on bending but also the effect of axial force on torsion are considered. Higher order terms in the displacement function are considered. So this matrix is perfect and more precise than Oran’s tangent stiffness matrix. An example of a single layer reticulated shell is provided, which verified the correctness and good accuracy of the present model, and this model can be suited to the non-liner stablity analysis of reticulated shell.

Numerical Analysis of Post-Tensioned Coupled Wall

2010 ◽  
Vol 163-167 ◽  
pp. 1935-1939
Author(s):  
Xiao Ning Cai ◽  
Shao Ping Meng ◽  
Jia Jia Chen ◽  
Wei Wei Sun
Keyword(s):  
Numerical Analysis ◽  
Residual Deformation ◽  
Good Precision ◽  
Analysis Model ◽  
Nonlinear Beam ◽  
Coupled Wall ◽  
Loading Tests ◽  
Cyclic Loading Tests ◽  
Nonlinear Shear ◽  
Column Element

Based on OpenSEES, nonlinear beam-column element based on fiber model and considered nonlinear shear deformation was used to simulate wall limb; zero-length elements were used to simulate action of prestressing tendon and connecting reinforcement in the interface between coupling beam and wall limb; the hysteretic models of the zero-length elements were established by programming. The low-cyclic loading tests of two PCW specimens were introduced. Results of the numerical analysis and the tests indicate that elasto-plastic performances of PCW can be well simulated by numerical analysis, analysis model based on OpenSEES can be applied to non-linear analysis and of good precision; PCW is of good self-centering ability with little residual deformation after unloading, and damage concentrating in certain parts that can be repaired after earthquake; energy dissipation capacity of PCW is increased because of the connecting reinforcement.

Study on the Member Buckling Influence to the Stability of Single-Layer Lattice Dome

2014 ◽  
Vol 638-640 ◽  
pp. 270-274
Author(s):  
Teng Fei Ma ◽  
Jiang Wang ◽  
Ying Fu Gao ◽  
Hui Zhou ◽  
Shu Ping Qu ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Single Layer ◽  
Space Structure ◽  
Large Span ◽  
Main Form ◽  
Overall Stability ◽  
The Stability

Single-layer lattice dome as a main form of large span space structure, its stability is the key of the research.Up to now, study on the stability of the single-layer lattice dome mainly depends on the overall stability, stability of the member buckling for single-layer lattice dome as a whole research is less. In this paper, based on the K8 single-layer lattice dome as an example, considering the node flaws and member, on the basis of the single-layer lattice dome of the joint at different location of the member to be weakened, to make it before the single-layer lattice dome of the overall instability buckling, comparative analysis of different location of single member buckling of the effect on the stability of the whole single-layer lattice dome.

scholarly journals Modelling and Stability Analysis of Articulated Vehicles

2021 ◽  
Vol 11 (8) ◽  
pp. 3663
Author(s):  
Tianlong Lei ◽  
Jixin Wang ◽  
Zongwei Yao
Keyword(s):  
Stability Analysis ◽  
Critical Velocity ◽  
Equations Of State ◽  
Steering System ◽  
Analysis Model ◽  
Nonlinear Dynamic Model ◽  
Equilibrium Equations ◽  
Eigenvalue Method ◽  
Articulated Vehicles ◽  
The Stability

This study constructs a nonlinear dynamic model of articulated vehicles and a model of hydraulic steering system. The equations of state required for nonlinear vehicle dynamics models, stability analysis models, and corresponding eigenvalue analysis are obtained by constructing Newtonian mechanical equilibrium equations. The objective and subjective causes of the snake oscillation and relevant indicators for evaluating snake instability are analysed using several vehicle state parameters. The influencing factors of vehicle stability and specific action mechanism of the corresponding factors are analysed by combining the eigenvalue method with multiple vehicle state parameters. The centre of mass position and hydraulic system have a more substantial influence on the stability of vehicles than the other parameters. Vehicles can be in a complex state of snaking and deviating. Different eigenvalues have varying effects on different forms of instability. The critical velocity of the linear stability analysis model obtained through the eigenvalue method is relatively lower than the critical velocity of the nonlinear model.

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