Performance Evaluation of a Transmission Tower Subjected to Base Settlement

2015 ◽  
Vol 744-746 ◽  
pp. 361-365
Author(s):  
Yi Jiang Wu ◽  
Qing Dong Meng ◽  
Gan Jun Wang
Keyword(s):  
Finite Element ◽  
Structural Damage ◽  
Element Model ◽  
Structural Safety ◽  
Transmission Tower ◽  
Element Analysis ◽  
Line System ◽  
Transmission Angle ◽  
Element Approach ◽  
Internal Forces

The simulation of support settlement of a transmission angle-tower is actively carried out in this study based on the actual structural damage events. The mechanical model of the transmission angle-tower is developed based on the spatial member finite element approach. The finite element model of the transmission tower-line system is constructed by taking a real 220KV transmission tower as an example. The support settlement of the tower is analyzed and the collected information are utilized in the structural finite element analysis. The made observations indicate that the support settlement may induce large structural internal forces, which may induce potential disk to the structural safety.

Finite Element Analysis for the Collapse Accident of One 110kV Transmission Tower

2013 ◽  
Vol 690-693 ◽  
pp. 1940-1944
Author(s):  
Ming Jian Jian ◽  
Du Qing Zhang ◽  
Guang Cheng Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Transmission Line ◽  
Element Model ◽  
Strong Wind ◽  
Transmission Tower ◽  
Element Analysis ◽  
Line System ◽  
Buckling Instability

One collapse tower of 110 kV transmission line was taken as an example and a finite element model for the coupled tower-line system was established for investigating the effects of the strong wind on the transmission tower and line. The result shows that the selected standard of material of some rod members is lower, and the area of their section is relatively small. Main legs present buckling instability because of being in compression under action of the strong wind, which leads to the collapse accident of the towers.

scholarly journals Collapse Analysis of a Transmission Tower-Line System Induced by Ice Shedding

2021 ◽  
Vol 9 ◽  
Author(s):  
Jiaxiang Li ◽  
Biao Wang ◽  
Jian Sun ◽  
Shuhong Wang ◽  
Xiaohong Zhang ◽  
...  
Keyword(s):  
Finite Element ◽  
Transmission Lines ◽  
Progressive Collapse ◽  
Element Model ◽  
Transmission Tower ◽  
Line System ◽  
Finite Element Software ◽  
Transmission Towers ◽  
Ice Shedding ◽  
The Impact

Ice shedding causes transmission lines to vibrate violently, which induces a sharp increase in the longitudinal unbalanced tension of the lines, even resulting in the progressive collapse of transmission towers in serious cases, which is a common ice-based disaster for transmission tower-line systems. Based on the actual engineering characteristics of a 500 kV transmission line taken as the research object, a finite element model of a two-tower, three-line system is established by commercial ANSYS finite element software. In the modeling process, the uniform mode method is used to introduce the initial defects, and the collapse caused by ice shedding and its influencing parameters are systematically studied. The results show that the higher the ice-shedding height is, the greater the threat of ice shedding to the system; furthermore, the greater the span is, the shorter the insulator length and the greater the dynamic response of the line; the impact of ice shedding should be considered in the design of transmission towers.

Gust Response Factor of a Transmission Tower Under Typhoon

2020 ◽  
pp. 2150001
Author(s):  
Xing Fu ◽  
Wen-Long Du ◽  
Hong-Nan Li ◽  
Wen-Ping Xie ◽  
Kai Xiao ◽  
...  
Keyword(s):  
Wind Speed ◽  
Field Measurements ◽  
Element Model ◽  
Structural Safety ◽  
Transmission Tower ◽  
Response Factors ◽  
Line System ◽  
Transmission Towers ◽  
Synoptic Wind ◽  
Gust Response

The gust response factors (GRFs) of transmission towers in current standards are reviewed for synoptic winds. The collapse of most transmission towers has occurred under the high-intensity wind (HIW) caused by events such as typhoons, hurricanes, and downbursts. Thus, this paper studies the GRF of a transmission tower under the typhoon. First, the definition of GRF and its extended form for the transmission towers are developed. Then the wind speed simulation of a typhoon event is introduced. Based on the structural health monitoring (SHM) system installed on tower #32, the measured GRFs under the super typhoon Mangkhut are calculated. Then the finite element model (FEM) of the transmission tower-line system is established to simulate the dynamic response to further calculate the GRFs, which agrees well with the field measurements. Both the field measurement and simulation results show that the GRFs under the typhoon are larger than those under the synoptic wind and that the recommended GRFs in the Chinese standard underestimate the peak responses. Finally, a parametric analysis is performed, which demonstrates that the turbulence intensity, wind speed, and power-law exponent all have great effects on the GRFs of transmission towers. In the HIW-prone areas, it is recommended that the characteristics of the HIW can be considered in improving the GRF values to guarantee the structural safety of transmission towers.

Damage Inspection and Assessment on a Transmission Angle Tower in Coastal Areas

2013 ◽  
Vol 671-674 ◽  
pp. 650-654
Author(s):  
Peng Yun Li ◽  
Bo Chen ◽  
Yu Zhou Sun
Keyword(s):  
Structural Model ◽  
Wind Loading ◽  
Transmission Tower ◽  
Line System ◽  
Steel Material ◽  
Transmission Angle ◽  
Commercial Package ◽  
Loading Effects ◽  
Structural Responses ◽  
Element Approach

The field inspection and safety assessment of a transmission angle tower are actively carried out in this study. The field measurement and inspection are firstly introduced and then the structural model is constructed based on finite element approach with the aiding of commercial package ANSYS. The equation of motion of the transmission tower-line system is established for numerical analysis. The gravity, base settlement and dynamic wind loading are applied on the tower to examine the structural responses. The deformation and stresses distribution of the transmission angle tower are computed to explore the damage reasons. The made observations indicate that the peak stresses of some members are large than the permitted yielding stresses of steel material. The damage event is induced by coupling loading effects

Finite Element Analysis of Mechanical Characteristics on the Composite Rubber Suspension of Heavy Vehicle

2011 ◽  
Vol 121-126 ◽  
pp. 1702-1706
Author(s):  
Hui Pang ◽  
Hong Yan Li ◽  
Zong De Fang ◽  
Xiao Yuan Zhu
Keyword(s):  
Finite Element ◽  
Lightweight Design ◽  
Element Model ◽  
Heavy Vehicle ◽  
Virtual Design ◽  
Element Analysis ◽  
Static Mechanical ◽  
Element Approach ◽  
Suspension Stiffness ◽  
Static Mechanical Properties

Taking the composite rubber suspension of a 6×4 heavy vehicle as research object, an accurate finite element model for the composite suspension at loading states is firstly built with consideration of nonlinear contact between spring leaves, and then a new finite element approach for calculating and analyzing static mechanical properties of the composite rubber suspension. Finally, the stress distribution and deformation is analyzed under different loads by using Hypermesh software and the results can be applied to its strength design. And moreover, some primary principles of the composite rubber suspension stiffness and displacement changing with different loads are obtained, which provides reference basis for virtual design and lightweight design of the vehicle composite rubber suspension.

Finite Element Analysis of Foundation Settlement of 220kV Transmission Tower with Independent Foundation

2012 ◽  
Vol 201-202 ◽  
pp. 602-607 ◽  
Author(s):  
Bo Li ◽  
Ming Jian Jian ◽  
Du Qing Zhang ◽  
Guang Cheng Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Transmission Lines ◽  
Vertical Displacement ◽  
Mining Area ◽  
Transmission Tower ◽  
Element Analysis ◽  
Coal Mining Area ◽  
Coupling System ◽  
Internal Forces

The uneven subsidence of the independent foundation of the transmission tower often happens in the coal mining area, which causes serious threat to the safe operation of transmission lines. In this paper, the finite element analysis is carried out for a certain 220kV tower-ling coupling system, and the effects of the different kinds of earth deformations on the structure responses are studied. The results show that the contribution of the vertical displacement of the foundation to the variations of the internal forces of the tower is quite small and the resultant stress does not exceed its critical value. However, in the same load conditions, when the distance of root span changed or asymmetry settlement is overexertion, the truss member stress of the cross braces exceeds the yield strength of the materials and occurs yield deformation.

Finite Element Analysis for Interior Booming Noise Reduction in a Tractor Cabin

2005 ◽  
Author(s):  
Ji Cao ◽  
Liming Dai
Keyword(s):  
Finite Element ◽  
Low Frequency ◽  
Element Model ◽  
Structural Vibration ◽  
Steel Beams ◽  
Element Analysis ◽  
Resonant Frequencies ◽  
Model Counting ◽  
Element Approach ◽  
Aluminum Panels

This paper presents a finite element approach to analyze the “boom” noise for a compact tractor cabin. The tractor cabin is initially designed to have a structure made up of steel beams and aluminum panels, as well as PMAA panels in windshield, backlight and windows. Cavity acoustic modes of the cab are evaluated and the acoustic resonant frequencies are identified. The study on the structural-borne noise from the cabin structural vibration generated by the engine of the vehicle is performed. A coupled-field finite element model, counting the interactions between the air fluid inside the cabin compartment and the cabin exterior structure, is presented for investigating the structural-borne noise in a low frequency range of 20 Hz to 80 Hz. This range has shown strong boom effects. The interior noise level at driver’s right ear position is investigated. The peak noise levels at the position are determined. The effects of additional stiffeners and damping layers on the boom noise are also investigated.

Galloping of Transmission Tower-Line System and Anti-Galloping Research

2010 ◽  
Vol 44-47 ◽  
pp. 2666-2670
Author(s):  
Li Li ◽  
Wei Jiang ◽  
Hua Jin Cao
Keyword(s):  
Element Model ◽  
Nonlinear Finite Element ◽  
Control Measures ◽  
Transmission Tower ◽  
Line System ◽  
Transmission Towers ◽  
Coupling System ◽  
Internal Forces ◽  
Nonlinear Finite Element Model ◽  
Line Coupling

A nonlinear finite element model of transmission tower-line coupling system including transmissions, towers and insulators is established based on ANSYS in this paper. The restarting technology is proposed to solve the vertical, horizontal and torsional galloping of the transmission conductors. Under the condition of different wind velocity, galloping of tower line system is performed to get amplitude of the transmissions and internal forces of the transmission towers. Based on the typical case, the galloping control measures of using interphase spacers and multi-point weighting are performed. Various layouts projects of the galloping control measures are carried out and the effective ones are attained.

Finite Element Model Updating of Existing T-Girder Bridge by Field Quasi-Static Generalized Influence Line

2012 ◽  
Vol 226-228 ◽  
pp. 1609-1613 ◽  
Author(s):  
Jing Bo Liao ◽  
Guang Wu Tang ◽  
Fei Pan
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Structural Damage ◽  
Model Updating ◽  
Element Model ◽  
Finite Element Model Updating ◽  
Element Analysis ◽  
Influence Line ◽  
Girder Bridge ◽  
The Finite Element Model

Finite element model updating is the important foundation of structural damage detection, condition assessment for engineering structure. A new method, for finite element model updating based on the quasi-static generalized influence line (QSGIL) residual objection, is presented to update the finite element model of beam-structure in order to improve the quality and precision of finite element analysis. Both of the theory and model experimental study show that the proposal method can efficiently update the finite element model in the previous study [1]. In this paper, the updating techniques are further developed to update the finite element model of the existing T-Girder bridge, the QSGIL of the updating model agrees very well with the field QSGIL of the existing bridge, which illustrates that the proposal methodology is promising in the practical bridge structure and other structures.

The Study of Bus Superstructure Strength Based on ECE R66

2012 ◽  
Vol 430-432 ◽  
pp. 1799-1804 ◽  
Author(s):  
Guo Sheng Zhang ◽  
Wei Wang ◽  
Song Ai Piao ◽  
Xuan Dong
Keyword(s):  
Finite Element ◽  
Design Method ◽  
Element Model ◽  
The Body ◽  
Structural Safety ◽  
Element Analysis ◽  
Ece R66 ◽  
Safety Characteristic ◽  
Energy Absorbing ◽  
Body Section

Taking a full-monocoque body as the research object, the finite element analysis theory was applied to build the finite element model of the bus and the numerical simulation environment of the structural strength of the superstructure. The vehicle centre of gravity position determination was studied and calculated. According to the ECE R66 equivalent authentication method, the rollover test of body section was carried out. The rigid and strength characteristic of bus superstructure were evaluated. On this basis, the energy absorbing capability of body section during the rollover process was studied and evaluated. The results showed that the body section of bus was complied with the regulatory requirements; its structural safety characteristic was good. This design method of rollover crash safety had important significance and value to research and development of manufacturer.

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