A STUDY ON FAILURE OF CROSS ARMS IN TRANSMISSION LINE TOWERS DURING PROTOTYPE TESTING

2005 ◽  
Vol 05 (03) ◽  
pp. 435-455 ◽  
Author(s):  
N. PRASADA RAO ◽  
S. J. MOHAN ◽  
N. LAKSHMANAN
Keyword(s):  
Finite Element ◽  
Transmission Line ◽  
Nonlinear Finite Element ◽  
Test Results ◽  
Nonlinear Finite Element Method ◽  
Element Analysis ◽  
Plate Elements ◽  
The Finite Element Analysis ◽  
Different Types ◽  
The Cross

In this paper, the need for testing of transmission line towers is emphasized. The failure of cross arms that constitute a part of the tower body is analyzed by the nonlinear finite element method. The finite element analysis results are compared with the test results and the reasons for failure are discussed in detail. The cross arm is modeled using beam and plate elements. Four different types of towers with cross arms are considered. The effect of inner triangulation formed by the redundant patterns on the cross arm performance is studied. The effect of staggering secondary bracings in elevation and plan of the cross arm and detailing of cross arm tips (loading points) are also studied.

Effect of Cracked Blade Distribution on Strength of Centrifugal Impeller

2013 ◽  
Vol 423-426 ◽  
pp. 1884-1888
Author(s):  
Gang Cheng ◽  
Jian Feng Li ◽  
Wei Qiang Wang ◽  
Jie Sun
Keyword(s):  
Finite Element ◽  
Centrifugal Force ◽  
Numerical Models ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Centrifugal Impeller ◽  
Nonlinear Finite Element Method ◽  
Element Analysis ◽  
Equilibrium Pressure ◽  
The Finite Element Analysis

In this paper, the finite element analysis is made to the structure of the impeller, a finite element model of a impeller with cracks was established. This paper presents results of the stress analysis of the compressor blade subjected to centrifugal force and aerodynamic equilibrium pressure. A nonlinear finite element method was utilized to determine the stress state of the blades. In this analysis, the numerical models without defects and also with cracks were defined. The simulation results showed that high stresses occurred in the areas where the cracks initiated under both centrifugal force and aerodynamic equilibrium pressure. The distribution of two cracked blades can greatly influence the stress level of the impeller; when two cracked blades locate in the adjacent positions，the increasing value of stress is minimum. When the two cracked blades separated by 150°, the increasing value of stress is maximum. It provides a basis for strength calculation of the impeller.

scholarly journals NONLINEAR FINITE ELEMENT ANALYSIS OF NONSEISMICALLY DETAILED INTERIOR RC BEAM-COLUMN CONNECTION UNDER REVERSED CYCLIC LOAD

2017 ◽  
Vol 24 (4) ◽  
pp. 369-386
Author(s):  
Teeraphot Supaviriyakit ◽  
Amorn Pimanmas ◽  
Pennung Warnitchai
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Cyclic Load ◽  
Nonlinear Finite Element Analysis ◽  
Nonlinear Finite Element ◽  
Test Results ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Reversed Cyclic

This paper presents a nonlinear finite element analysis of non-seismically detailed RC beam column connections under reversed cyclic load. The test of half-scale nonductile reinforced concrete beam-column joints was conducted. The tested specimens represented those of the actual mid-rise reinforced concrete frame buildings designed according to the non-seismic provisions of the ACI building code.  The test results show that specimens representing small and medium column tributary area failed in brittle joint shear while specimen representing large column tributary area failed by ductile flexure though no ductile reinforcement details were provided. The nonlinear finite element analysis was applied to simulate the behavior of the specimens. The finite element analysis employs the smeared crack approach for modeling beam, column and joint, and employs the discrete crack approach for modeling the interface between beam and joint face. The nonlinear constitutive models of reinforced concrete elements consist of coupled tension-compression model to model normal force orthogonal and parallel to the crack and shear transfer model to capture the shear sliding mechanism. The FEM shows good comparison with test results in terms of load-displacement relations, hysteretic loops, cracking process and the failure mode of the tested specimens. The finite element analysis clarifies that the joint shear failure was caused by the collapse of principal diagonal concrete strut.  

Numerical Analysis of Punching Shear Failure of Self-Compacting Fiber Reinforced Concrete (SCFRC) Ribbed Slabs

2019 ◽  
Vol 972 ◽  
pp. 93-98
Author(s):  
Nurulain Hanida Mohamad Fodzi ◽  
M.H. Mohd Hisbany
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Shear Failure ◽  
Nonlinear Finite Element ◽  
Fiber Reinforced Concrete ◽  
Punching Shear ◽  
Nonlinear Finite Element Method ◽  
Fiber Reinforced ◽  
Element Analysis ◽  
Abaqus Software

This paper deals with behavior and capacity of punching shear resistance for ribbed slabs produce from self-compacting fiber reinforced concrete (SCFRC) by application of nonlinear finite element method. The analysis will be achieved by using ABAQUS software. The nonlinear finite element analysis by ABAQUS will be compare with the experimental results. Results and conclusions may be useful for establishing recommendation and need to be acknowledged.

ANALYTICAL AND EXPERIMENTAL STUDIES ON 400 kV S/C PORTAL-TYPE GUYED TOWERS

2009 ◽  
Vol 09 (01) ◽  
pp. 85-106
Author(s):  
N. PRASAD RAO ◽  
S. J. MOHAN ◽  
R. P. ROKADE ◽  
R. BALA GOPAL
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Studies ◽  
Ground Level ◽  
Test Results ◽  
Element Analysis ◽  
Finite Element Software ◽  
The Finite Element Analysis ◽  
Guyed Towers ◽  
Analytical Behavior

The experimental and analytical behavior of 400 kV S/C portal-type guyed towers under different loading conditions is presented. The portal-type tower essentially consists of two masts extending outward in the transverse direction from the beam level to the ground. In addition, two sets of guys connected at the ground level project outward along the longitudinal axes and converge in the transverse axes. The experimental behavior of the guyed tower is compared with the results of finite element analysis. The 400 kV portal-type guyed towers with III and IVI type insulator strings are analyzed using finite element software. Full scale tower test results are verified through comparison with the results of the finite element analysis. The initial prestress in the guys is allowed to vary from 5% to 15% in the finite element modeling. The effect of prestress variation of the guys on the tower behavior is also studied.

The Tip/Tilp Mirror Modal Analysis Based on Flexible Connection of Equivalent Spring

2014 ◽  
Vol 697 ◽  
pp. 226-229
Author(s):  
Cai Ling Wang ◽  
Hong Wei Wang
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Modal Analysis ◽  
Detection System ◽  
Mirror System ◽  
Test Results ◽  
Element Analysis ◽  
Element Modeling ◽  
The Finite Element Analysis ◽  
Resonance Detection

According to flexible connectivity of space stabilization system,This paper proposes the finite element analysis method using multiple equivalent spring connecting unit to replace the original flexible connections. And the elastic coefficient’s correspondence between the equivalent spring and the original spring were deduced. Using the equivalent spring method, the tip/tilt mirror system for finite element modeling is completed, After completion of the modal analysis, first-order resonant frequency is calculated. At last, the tip/tilt mirror system is tested in non-contact laser resonance detection system, And test results and modal analysis results were compared, and results show that the finite element modeling method of using equivalent spring connecting is effective. Provide constructive reference for subsequent tip/tilt mirror design, has a very important reference for similar projects.

The Layout of Strain Sensor Based on the Preanalysis Load Distribution

2012 ◽  
Vol 155-156 ◽  
pp. 474-478
Author(s):  
Yi Lu ◽  
Song Lin Zheng ◽  
Jin Zhi Feng ◽  
Li Hui Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Load Distribution ◽  
Rear Axle ◽  
Strain Tensor ◽  
Test Results ◽  
Analysis Method ◽  
Element Analysis ◽  
Main Stress ◽  
The Finite Element Analysis

In this paper, the load distribution of the rear axle of a MPV is preanalyzed, by using the finite element analysis method, which obtains the contour and the strain tensor maps in the four working conditions of the rear axle: static load, braking, steering and torsion. By analyzing the contour and strain tensor maps, the key load locations and their main stress direction is identified. Through processing data of the calibration tests, the equations of linear regression between load and strain on the rear axle are determined.Comparing with the real 5vehicle road test results, the placement locations of the sensor on the rear axle, which is determined through the finite element analysis, are verified to be correct.

Nonlinear Finite Element Analysis of the Piston Rod under the Impact Load

2013 ◽  
Vol 448-453 ◽  
pp. 3359-3364 ◽  
Author(s):  
Xiao Yu Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Impact Load ◽  
Maximum Load ◽  
Nonlinear Finite Element ◽  
Pulse Load ◽  
Transient Dynamic Analysis ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
The Impact

This paper traverses failure phenomenon about the piston rod of rapping device. Through the ANSYS/ls-dyna software, the finite element analysis was carried out on the piston rod ,force of the impact on the piston rod was taken as the form of triangular pulse load, whose time was lasting 0.05s, and it can get the maximum load in 0.025s. Maximum stress occured at the fillet of the piston rod are obtained. Based on nonlinear finite element method for transient dynamic analysis of the piston rod , analysis results are consistent with the actual conditions, and demonstrates the feasibility of finite element analysis.

scholarly journals Building Structure Simulation System Based on BIM and Computer Model

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Bao Zhu ◽  
Huan Feng
Keyword(s):  
Finite Element ◽  
Simulation Method ◽  
Test System ◽  
Simulation System ◽  
Building Structure ◽  
Test Results ◽  
Element Analysis ◽  
Element Simulation ◽  
The Finite Element Analysis ◽  
Structure Simulation

This paper does some research and discussion on the finite element analysis of a building structure, especially the computer graphics simulation method in building structure simulation. Moreover, with the support of BIM technology and computer finite element simulation technology, this paper constructs a building structure simulation system and analyzes the building structure simulation system based on actual conditions such as building structure and stress load. In addition, this paper improves the traditional structural analysis algorithm and designs experiments to evaluate the effect of the method proposed in this paper and analyze the data in the form of simulation to compare the validity of the test results. Finally, an experiment is designed to evaluate the data processing capability of the test system in this paper. The experimental analysis results verify the effectiveness of the method in this paper, which can provide relevant theoretical references for subsequent building structure simulation.

scholarly journals Finite Element Analysis of Precast Concrete Connections under Incremental load

2019 ◽  
Author(s):  
Masoud Davari ◽  
Mahyar Ramezani ◽  
Aliakbar Hayatdavoodi ◽  
Mohammad Nazari
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Precast Concrete ◽  
Experimental Program ◽  
Concrete Frames ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Different Types ◽  
Connection System ◽  
Experimental Researches

Beam-to-column connections affect the rigidity and strength of the overall precast concrete structures. Even though many experimental researches have been carried out on beam-to-column connections, the behavior and failure mode of the connection in precast concrete is often difficult to assess through experimental program. The finite element analysis, on the other hand, can be an option to properly evaluate the condition of the connections. Nevertheless, the finite element analysis on the beam-to-column connections is quite limited. Thus, there is a need to study and explore the behavior of the connection system based on the finite element data. In this research, the finite element analysis was performed to study the performance of different types of beam-to-column connections in precast concrete frames. A total of four specimens were modeled and analyzed to study the connection behavior involving load-displacement relationship under static incremental load. Different connection details were considered and the behavior of various beam-to-column connections were investigated.

Sign in / Sign up

Export Citation Format

Share Document