Experimental Study and Finite Element Analysis on Dynamic Property of the Reinforced Concrete Frame-Bent Structure

2011 ◽  
Vol 243-249 ◽  
pp. 5223-5226
Author(s):  
Xiao Hong Bai ◽  
Lei Xie ◽  
Tao Wang
Keyword(s):  
Dynamic Property ◽  
Large Scale ◽  
Similarity Theory ◽  
Dynamic Properties ◽  
Thermal Power ◽  
Scale Model ◽  
Original Structure ◽  
Reinforced Concrete Frame ◽  
Element Analysis ◽  
Concrete Frame

Based on the R.C. frame-bent structure in a large-scale thermal power plant’s main building, a 1/7 scale model has been tested by man-excitaiton to determine its’ dynamic properties. The former three frequencies and vibration modes of the model are obtained, and the dynamic property of the original structure is studied based on model similarity theory. At last, modal analysis of plane model and spatial model of prototype are discussed by using ANSYS FEA software, and the spatial dynamic preperty of the irregular structure is analyzed.

scholarly journals Stator Non-Uniform Radial Ventilation Design Methodology for a 15 MW Turbo-Synchronous Generator Based on Single Ventilation Duct Subsystem

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2760
Author(s):  
Ruiye Li ◽  
Peng Cheng ◽  
Hai Lan ◽  
Weili Li ◽  
David Gerada ◽  
...  
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Design Methodology ◽  
Large Scale ◽  
Synchronous Generator ◽  
Axial Direction ◽  
Scale Model ◽  
Element Analysis ◽  
Axial Temperature ◽  
Ventilation Duct

Within large turboalternators, the excessive local temperatures and spatially distributed temperature differences can accelerate the deterioration of electrical insulation as well as lead to deformation of components, which may cause major machine malfunctions. In order to homogenise the stator axial temperature distribution whilst reducing the maximum stator temperature, this paper presents a novel non-uniform radial ventilation ducts design methodology. To reduce the huge computational costs resulting from the large-scale model, the stator is decomposed into several single ventilation duct subsystems (SVDSs) along the axial direction, with each SVDS connected in series with the medium of the air gap flow rate. The calculation of electromagnetic and thermal performances within SVDS are completed by finite element method (FEM) and computational fluid dynamics (CFD), respectively. To improve the optimization efficiency, the radial basis function neural network (RBFNN) model is employed to approximate the finite element analysis, while the novel isometric sampling method (ISM) is designed to trade off the cost and accuracy of the process. It is found that the proposed methodology can provide optimal design schemes of SVDS with uniform axial temperature distribution, and the needed computation cost is markedly reduced. Finally, results based on a 15 MW turboalternator show that the peak temperature can be reduced by 7.3 ∘C (6.4%). The proposed methodology can be applied for the design and optimisation of electromagnetic-thermal coupling of other electrical machines with long axial dimensions.

Acoustic Emission Testing of Concrete Frame during Pseudo Dynamic Loading

2006 ◽  
Vol 13-14 ◽  
pp. 195-200
Author(s):  
Athanasios Anastasopoulus ◽  
S. Bousias ◽  
A. Tsimogiannis ◽  
T. Toutountzakis
Keyword(s):  
Acoustic Emission ◽  
Dynamic Testing ◽  
Frame Structure ◽  
Scale Model ◽  
Reinforced Concrete Frame ◽  
Energy Rate ◽  
Concrete Frame ◽  
Emission Testing ◽  
Real Size ◽  
Acoustic Emission Testing

Acoustic Emission (AE) monitoring was performed during Pseudo-Dynamic Testing of a torsionally unbalanced, two-storey, one-by-one bay reinforced concrete frame structure. The structure represented a 0.7-scale model of a real-size frame structure designed and detailed according to the standards prevailing in Greece in 60's, without engineered earthquake resistance. Real time monitoring of AE activity versus the complex applied load resulted in semi quantitative damage characterization as well as comparative evaluation of the damage evolution of the different size columns. Evolution of the AE energy rate per channel, as revealed from zonal location, and the energy rate of linearly located sources enabled the identification of damage areas and the forecast of crack locations before cracks were visible with naked eye. In addition to that, the results of post processing evaluation allowed for the verification of the witnessed damaged areas and formed the basis for quantitative assessment of damage criticality.

Research on the Nonlinearity Finite Element in the Super-Long Reinforced Concrete Frame Structure

2014 ◽  
Vol 1065-1069 ◽  
pp. 1226-1229
Author(s):  
Yong Sheng Zhang ◽  
Yan Ying Li
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Internal Force ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Engineering Project ◽  
Element Analysis ◽  
Concrete Frame ◽  
Temperature Load ◽  
Reinforced Concrete Frame Structure

Basing on the finite element analysis software, the emergence of crack under the effect of gradual changed temperature load and the change of stress which are in the condition of super reinforced concrete frame structure are analyzed from the linear and nonlinear numeral simulation. The simulation shows that the structure component under the normal condition is cracked and turn into the nonlinear condition and the steel bars still works under the elastic stage. Meanwhile the actual stage which is reflected by the elastic-plastic analysis of the internal force and deformation is compared by the results which are obtained by the actual project observed results and the calculation of the simplified model. So the distribution of the stress which is caused by the structure temperature reduction is greatly evaluated by the usage of the cracking model which is nonlinear finite element and also plays an important role in the engineering project and practice.

Multi-Type Finite Elements Hybrid Model for Simulating Global Behavior of Reinforced Concrete Frames in Fires

2013 ◽  
Vol 353-356 ◽  
pp. 2357-2361
Author(s):  
Yong Jun Liu ◽  
Yang Yang Liu ◽  
Ran Bi ◽  
Jing Hai Zhou
Keyword(s):  
Reinforced Concrete ◽  
Finite Elements ◽  
Hybrid Model ◽  
Large Scale ◽  
Research Work ◽  
Concrete Structures ◽  
Concrete Frames ◽  
Reinforced Concrete Frame ◽  
Element Analysis ◽  
Reinforced Concrete Frames

In general, reinforced concrete frames have excellent fire resistance properties, but more and more concrete buildings collapsed in fires. The majority of past research work on the response of concrete building to fire has looked at the effects of fire upon individual structural members, and most commonly when subjected to heating from standard fire tests. At present, the fire behaviors of whole reinforced concrete frame are not adequately understood. There is a great need for development of models which consider the effects of fire on the whole structure under more realistic heating regimes. There is also a fundamental requirement for further large-scale testing of concrete structures, to observe the behavior of whole concrete structures in real fires and also for validation of advanced computer analysis tools. Accuracy and efficiency are two major concerns in finite element analysis of structural response of concrete frames in fires. In this paper, a multi-type finite elements hybrid model for simulating structural behavior of whole reinforced concrete frames in real fire is suggested.

Numerical Simulation of a RC Frame Shaking Table Test Model Based on CANNY

2010 ◽  
Vol 163-167 ◽  
pp. 981-986
Author(s):  
Li He ◽  
Xian Guo Ye
Keyword(s):  
Numerical Simulation ◽  
Shaking Table Test ◽  
Simulation Analysis ◽  
Shaking Table ◽  
Test Model ◽  
Rc Frame ◽  
Reinforced Concrete Frame ◽  
Element Analysis ◽  
Concrete Frame ◽  
History Of

This paper presents the nonlinear dynamic simulation analysis of a shaking table test specimen, which was a twelve- story reinforced concrete frame and tested under base excitations representing four earthquake records of increasing intensity. Owing to the length constraint of the paper, three cases are used for the simulation. The numerical simulation of the test model is conducted utilizing the finite element analysis procedure CANNY, and the analysis results include the natural frequency, response history of the frame and the damage evolution. It is concluded from comparisons between experimental results and the numerical simulation ones that the latter matches well with the former, therefore the validity of the analytical method and model for simulation of RC frame shaking table test is proved.

scholarly journals An Optimization Model for Tramp Ship Scheduling considering Time Window and Seaport Operation Delay Factors

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Ang Yang ◽  
Yu Cao ◽  
Kang Chen ◽  
Qingcheng Zeng ◽  
Zigen Chen
Keyword(s):  
Power Plant ◽  
Thermal Power Plant ◽  
Large Scale ◽  
Time Window ◽  
Programming Model ◽  
Thermal Power ◽  
Scale Model ◽  
Mixed Integer ◽  
Ship Scheduling ◽  
Operation Cost

The quantity of electrical coal transported through the tramp shipping network is increasing due to the high demands. This trend has increased the scheduling difficulty combined with the underdevelopment of the private thermal power plant port. The high coal consumption and low port storage capacity requires the scheduling of the tramp ship to be on a strict time window to ensure the continuous operation of the thermal power plant. The low port unloading capacity often leads to the port congestion and delay of the unloading operation. This paper develops a mixed-integer-programming model for the optimization of the tramp ship scheduling to reduce the total operation cost, including the transportation cost and the unloading waiting cost, and the branch-and-price algorithm is adopted to solve this large-scale model. The model and algorithm are tested with historical operation data from the thermal power plant in the southern coastal areas of China. The optimized scheme significantly reduces the total operation cost by reducing the unloading waiting time and the number of active vessels in certain periods. The results also demonstrate the algorithm improvement in the aspects of the optimization quality and efficiency comparing with the heuristic solution.

Finite Element Analysis of Dynamic Property of Agricultural Vehicle Frame

2013 ◽  
Vol 694-697 ◽  
pp. 186-189 ◽  
Author(s):  
Sheng Li Kong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Working Conditions ◽  
Dynamic Property ◽  
Natural Frequencies ◽  
Dynamic Properties ◽  
Element Model ◽  
Element Analysis ◽  
Idle Speed ◽  
Deformation Problem

The vibration deformation problem of vehicle frame directly affects the safety and comfort of whole vehicles. In order to fully understand the dynamic properties of vehicle frame, a finite element model for vehicle frame is established and the natural frequencies of vehicle frame for free working conditions are solved. Compared to the actual excited frequency of matched engine running in the idle speed, some instructive suggestions are given. Those results can be helpful for improvement and optimization of the vehicle frames.

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