Static analysis and design of sandwiched composite long-span portable beam

2011 ◽  
Vol 6 (27) ◽  
Author(s):  
Norazman Mohamad Nor,
Keyword(s):  
Static Analysis ◽  
Analysis And Design ◽  
Long Span

Research on Dynamic Characteristics of Large Span Transmission Tower in Icing Environment

2013 ◽  
Vol 756-759 ◽  
pp. 4262-4266 ◽  
Author(s):  
Yue Du ◽  
Lan Jiang ◽  
Yu Xin Zhou ◽  
Qiao Rong Li ◽  
Tai Ran Wan ◽  
...  
Keyword(s):  
High Altitude ◽  
Dynamic Characteristics ◽  
Weather Conditions ◽  
Research Subject ◽  
Transmission Tower ◽  
Analysis And Design ◽  
Large Span ◽  
Long Span ◽  
Tower Structure ◽  
High Altitude Area

The transmission tower with a big span in the freezing area is very sensitive to climate. When extreme weather approaches, the tower may collapse easily. The dynamic characteristics of transmission tower structure vary under different weather conditions. This paper, taking a 500kV long span tangent tower as the research subject, will demonstrate the dynamic characteristics of such structures when the weight of wires, the icing stiffness of tower structure and the thickness of ice are considered. The results show that icing has a great impact on the dynamic characteristics of the tower structure and it can not be neglected. When the ice is thick, the contribution of icing to the stiffness of the structure should be considered. This conclusion can provide a reference for the analysis and design of similar towers in high altitude area.

scholarly journals Analysis and Design of Reinforced Concrete Thin Cylindrical Shell

2021 ◽  
Vol 2070 (1) ◽  
pp. 012162
Author(s):  
Gulzar H. Barbhuiya ◽  
Syed Danish Hasan ◽  
Mohammed Harun Al-Rashid
Keyword(s):  
Structural Design ◽  
Shell Structures ◽  
Thin Cylindrical Shell ◽  
Interior Space ◽  
Analysis And Design ◽  
Long Span ◽  
Final Stress ◽  
Bending Stresses ◽  
To Come ◽  
Steel Institute

Abstract The need to come up with economical and efficient structural design led the engineers and researchers to focus more on shell structures. It is more durable, economical as it requires a minimum amount of material provides larger interior space and is aesthetic. A shell dominantly behaves as a membrane, though, at the edges, bending stresses get accumulated. Albeit several theories have been put forward, Schorer’s theory is eminent in the analysis of the long span thin cylindrical shells. This study is focused on the analysis of the stresses by utilizing the Fourier series and Schorer’s theory. Further, the shell is designed for the steel reinforcement as per the Concrete Reinforcing Steel Institute (CRSI) Design Handbook after calculating the final stress resultants and the detailing is also depicted.

Efficient Static Analysis and Design of Flexible Risers

1991 ◽  
Vol 113 (3) ◽  
pp. 235-240 ◽  
Author(s):  
H. R. Riggs ◽  
T. Leraand
Keyword(s):  
Static Analysis ◽  
Design Method ◽  
Single Element ◽  
Flexible Riser ◽  
Analysis And Design ◽  
Drag Forces ◽  
Adaptive Discretization ◽  
Fluid Drag ◽  
Flexible Risers ◽  
Marine Cables

An improved cable element for static analysis is presented based on the equations of an elastic catenary. The element includes an algorithm for adaptive discretization when fluid drag forces are present. Hence, a single element can be used to model many marine cables, regardless of length. The element is applied to flexible riser analysis and preliminary design, which is automated by solving a nonlinear programming problem. Results demonstrate that a practical automated design method can be developed following the procedure presented here.

Analysis and Design of Integrated Optimization of 1.5MW Wind Turbine Tower

2014 ◽  
Vol 971-973 ◽  
pp. 958-961
Author(s):  
Yong Zhi Xie ◽  
An Le Mu
Keyword(s):  
Mathematical Modeling ◽  
Wind Turbine ◽  
Modal Analysis ◽  
Static Analysis ◽  
Optimization Algorithm ◽  
Parametric Modeling ◽  
Analysis And Design ◽  
Wind Turbine Tower ◽  
Tower Structure ◽  
Ansys Workbench

This paper uses Isight_FD 5.6 to integrate UG8.0 parametric modeling, ANSYS Workbench static analysis, modal analysis, and mathematical modeling of design optimization, by means of optimization algorithm, to meet strength and the stiffness of the tower, to realize the optimization of tower structure, so as to attain the expected target which reduces the weight of tower.

Instability Behaviour of Single Layer Reticulated Shells

1992 ◽  
Vol 7 (4) ◽  
pp. 243-252 ◽  
Author(s):  
Victor Gioncu ◽  
Nicolae Balut
Keyword(s):  
Static Analysis ◽  
Load Distribution ◽  
Single Layer ◽  
Final Part ◽  
Discrete Structure ◽  
Analysis And Design ◽  
Factors Influencing ◽  
Mesh Density ◽  
Geometrical Factors ◽  
Shell Geometry

The aim of the present paper is to draw the attention of the designers (often fascinated by the beauty of static analysis) to the essential factors influencing the behaviour of single-layer reticulated shells. These can be classified into geometrical factors (shell geometry and mesh density) and behaviour factors (geometrical and material nonlinearities, forms of instability, imperfections, stiffness of joints, load distribution). The analysis and design conceptions (equilibrium bifurcation or limitation, continuum or discrete structure) are discussed in the final part of the paper. It was tried to present all aspects in the simplest possible form, emphasizing the essence of the investigated phenomena.

scholarly journals Kineto-Static Analysis and Design Optimization of a 3-DOF Wrist Rehabilitation Parallel Robot with Consideration of the Effect of the Human Limb

Machines ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 323
Author(s):  
Ying-Chi Liu ◽  
Kosuke Irube ◽  
Yukio Takeda
Keyword(s):  
Static Analysis ◽  
Parallel Robot ◽  
Interaction Force ◽  
Inverse Kinematic ◽  
Design Parameters ◽  
Analysis And Design ◽  
Parasitic Motion ◽  
Rehabilitation Robots ◽  
Inverse Kinematic Analysis ◽  
Human Limb

When designing rehabilitation robots, there remains the challenge of ensuring the comfort and safety of users, especially for wearable rehabilitation robots that interact with human limbs. In this paper, we present a kineto-static analysis of the 3-RPS parallel wrist rehabilitation robot, taking into account the soft characteristics of the human limb and its kinematic mobility. First, the human upper-limb model was made to estimate the interaction force and moment through inverse kinematic analysis. Second, a static analysis was conducted to obtain the force and moment acting on the human limb, which is directly related to the user’s comfort and safety. Then, the design parameters of the 3-RPS robot were obtained by generic optimization through kineto-static analysis. Finally, the influence of the parasitic motion of the 3-RPS robot and the initial offset between the wrist center and the robot moving platform were discussed. Through the analysis results, we provide effective solutions to ensure the safety and comfort of the user.

scholarly journals Creep Characteristics Of Concrete Used In Long-Span Arch Bridge

2019 ◽  
Vol 14 (1) ◽  
pp. 18-36 ◽  
Author(s):  
Yongbao Wang ◽  
Renda Zhao ◽  
Yi Jia ◽  
Ping Liao
Keyword(s):  
High Speed ◽  
Concrete Structures ◽  
Mountainous Area ◽  
Concrete Creep ◽  
Arch Bridge ◽  
Analysis And Design ◽  
Model Code ◽  
Long Span ◽  
Creep And Shrinkage

The reinforced concrete arch bridge with concrete-filled steel tubular stiffened skeleton is extensively used in the mountainous area of southwest China due to their long span and high stability. Beibanjiang Bridge located in Shanghai- Kunming high-speed railway, which had a record span of 445 m, has recently been completed in 2016. However, concrete creep and shrinkage have pronounced effects on the long-term deflection and stress redistribution of this bridge. Several concrete creep and shrinkage specimens in the natural environment were made to predict the long-term behaviour of this bridge accurately. They were used to measure the concrete creep and shrinkage of the core concrete and surrounding concrete used in the arch bridge. The test results were compared to ACI209 R-92 Prediction of Creep, Shrinkage and Temperature Effects in Concrete Structures model, 1990 CEB-FIP Model Code 1990: Design Code model, fib Model Code for Concrete Structures 2010 model and Creep and Shrinkage Prediction Model for Analysis and Design of Concrete Structures-Model B3. Based on the numerical fitting method, the fib Model Code for Concrete Structures 2010 model was modified to suit the concrete creep and shrinkage experimental results. Then, the modified fib Model Code for Concrete Structures 2010 model was used to predict the timedependent behaviour of a concrete arch bridge.

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