Study on Joint Load Bearing of Steel Spiral Case and Surrounding Concrete

2011 ◽  
Vol 101-102 ◽  
pp. 451-454
Author(s):  
Wen Liang Ma ◽  
Wei Xing Chen
Keyword(s):  
Finite Element Method ◽  
Simulation Analysis ◽  
Hydropower Station ◽  
Distribution Law ◽  
Reaction Type ◽  
Spiral Case ◽  
Stress And Deformation ◽  
Joint Load ◽  
Case Structure ◽  
Different Thickness

Spiral case are important diversion parts of reaction type wheel, this paper adopts finite element method to carry out simulation analysis for spiral case structure of Shuikou hydropower station. Considering five calculation schemes in analysis, under different thickness and materials of cushion, researching stress and deformation distribution law of steel spiral case and surrounding concrete. Analyzing bearing ratio of steel spiral case and surrounding concrete, Research results provides reliable reference for design and construction of steel spiral case.

Study on Optimization under Internal Water Pressure of Spiral Case of Hydropower Station

2013 ◽  
Vol 438-439 ◽  
pp. 834-838
Author(s):  
Xin Yong Xu ◽  
Ying Bin Kang ◽  
Di Zhang
Keyword(s):  
Numerical Model ◽  
Working Conditions ◽  
Mechanical Characteristics ◽  
Simulation Analysis ◽  
Water Pressure ◽  
Hydropower Station ◽  
Internal Water ◽  
Nonlinear Contact ◽  
Spiral Case ◽  
Case Structure

Based on the ANSYS program, a numerical model of spiral case structure of hydropower station is built. The nonlinear contact characteristics are introduced in this model. For the working conditions under the different internal water pressure, structural simulation analysis is conducted. The effect of the internal water pressure on the structure, and the mechanical characteristics and stress of reinforcement are analyzed. The evolution process of concrete cracks, from microscopic period to macroscopic period is exhibited. The reasonable scheme of optimization under internal water pressure is attained.

Calculation and Analysis of Reinforced Concrete Continuous Box-Girder Overpass

2011 ◽  
Vol 101-102 ◽  
pp. 463-466
Author(s):  
Dong Yu Ji
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Simulation Analysis ◽  
Great Influence ◽  
Distribution Law ◽  
Box Girder ◽  
Common Structure ◽  
Element Simulation ◽  
Stress And Deformation ◽  
Calculation Software

Reinforced concrete continuous box-girder overpass is a common structure form, Wangzhuang overpass is example, this paper adopts universal finite element calculation software to carry out finite element simulation analysis for reinforced concrete continuous box-girder overpass. Considering the influence of overpass structure weight and driveway load, the distribution law of overpass stress and displacement were researched. Analysis results show that, load’s short-term effect combination has great influence on overpass structure, driveway slanting load’s influence on overpass structure’s stress and deformation can not be ignored.

Optimization of Steel Liner on Spiral Case Structure for a Large Hydropower Station

2013 ◽  
Vol 671-674 ◽  
pp. 868-872
Author(s):  
Hai Lin Wu ◽  
Shi He Qin ◽  
Xiao Fan Du
Keyword(s):  
Tensile Stress ◽  
Significant Variation ◽  
Crack Width ◽  
Hydropower Station ◽  
Reinforced Concrete Structure ◽  
Nonlinear Fem ◽  
Spiral Case ◽  
Steel Liner ◽  
Case Structure ◽  
Thinning Rate

Traditionally, spiral case structure is classified as non-member bar reinforced concrete structure. It is improper to calculate reinforcement area according to the area of tensile stress figure, which often causes a lot of waste of reinforcement; it is particularly true for the spiral case structure with steel liner. In combination with the practice of a spiral case of the hydropower station, the different schemes are proposed by 3-D nonlinear FEM software ABAQUS to study the feasibility of thinning steel liner in this paper. It is indicated that magnitude of steel liner and the hoop reinforcement stress is of no obviously increasement, damaged region of concrete is of no significant variation and the cracking range of peripheral concrete is of the requirements when the rate of steel liner thinning is tiny. When the thinning rate is 10%, there is a significant increase in crack width, but it still can meet the requirements of the specification. Although the magnitude of the stresses is not beyond the strength requirement, the maximum cracking width of concrete is over the designed standards when the rate is up to 30%. In this case, the crack width is controlled by collocating the more reinforcement in local positions. It is concluded that steel liner thinning is reasonable and feasible; what’s more, the magnitude of thinning is very large when the more reinforcement are collocated without prejudice to construction. It can provide references for optimization of the steel liner for the similar projects.

Application of Finite Element Method for Dry Masonry Overflow Dam Analysis

2013 ◽  
Vol 394 ◽  
pp. 332-335
Author(s):  
Min Tan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Characteristics ◽  
Simulation Analysis ◽  
Process Analysis ◽  
Construction Process ◽  
Distribution Law ◽  
Operational Process ◽  
Reservoir Construction ◽  
Element Method

Through analyzing dry masonry overflow dam structures mechanical characteristics in construction process and operational process, this paper adopts finite element method to carry out simulation analysis for dry masonry overflow dam of Daxilong reservoir. Deducing distribution law of the dams stress and displacement in construction process and operational process. Analysis results show that, dry masonry overflow dam of Daxilong reservoir construction is reasonable, it meets the requirements for design.

Research on Optimizing Precast Water Head on Preloading Filling Spiral Case of a Large-Scale Hydropower Station

2011 ◽  
Vol 243-249 ◽  
pp. 6183-6187
Author(s):  
Hai Lin Wu ◽  
Shi He Qin ◽  
Yao Li ◽  
Xiao Fan Du
Keyword(s):  
Finite Element Method ◽  
Large Scale ◽  
Mechanical Characteristics ◽  
Nonlinear Finite Element ◽  
Hydropower Station ◽  
Nonlinear Finite Element Method ◽  
Contact State ◽  
Water Head ◽  
Spiral Case ◽  
Pumped Storage

In combination with the practice of a pumped storage hydropower station, a 3-D nonlinear finite element method on the preloading filling spiral case is carried out to compare and analyze stresses of the steel spiral case and hoop reinforcement, the stress and bearing ratio of the surrounding concrete, the contact state between the spiral case and concrete in different precast water head. The results indicate that the stress of the surrounding concrete will get better with the increasing of precast water head. But there is a distance between the spiral case and the surrounding concrete when the water head is excessive, which is unhelpful for operating of the unit. When the precast water head of the spiral case is 439m or so, it can play a greater degree of mechanical characteristics of steel and concrete under the premise of operating stably of the unit.

Research on Reinforcement of Spiral Case during Capacity-Increasing Improvement for Gezhouba Hydropower Station

2012 ◽  
Vol 170-173 ◽  
pp. 2089-2094
Author(s):  
Xian Jun Wang
Keyword(s):  
Working Conditions ◽  
Three Dimensional ◽  
Hydropower Station ◽  
Calculation Results ◽  
Spiral Case ◽  
Stress And Deformation

The stress and deformation of spiral case of Gezhouba Hydropower Station under three working conditions such as before the capacity-increasing improvement, during the disassembly of the spiral case and after the capacity-increasing improvement are calculated by three dimensional FEM..the reinforcement plan of spiral case is proposed based on the above calculation results and also analyzed by three dimensional FEM. Study on the results of different working conditions mentioned above shows that the unit disassembly scheme is feasible and the reinforcement plan is effective.

Three-Dimensional Damage Analysis of Concrete Surrounding the Spiral Case in the Nuozhadu Hydropower Station

2011 ◽  
Vol 393-395 ◽  
pp. 1048-1053
Author(s):  
Ze Li ◽  
Li Xiang Zhang
Keyword(s):  
Three Dimensional ◽  
Element Model ◽  
Water Hammer ◽  
Damage Effect ◽  
Hydropower Station ◽  
Dimensional Finite Element ◽  
Spiral Case ◽  
Concrete Damage ◽  
Three Dimensional Finite Element ◽  
Case Structure

Studies have shown that the internal pressure of the spiral case could cause damage of the surrounding concrete, and the damage range and level are possible to grow with the repeated action of water hammer pressure. The security of spiral case structure may be adversely affected by damage of the surrounding concrete. In this paper, the case study of a spiral case which located in Nuozhadu hydropower station in Yunnan Province is presented. In order to analyze the damage effect of surrounding concrete under the repeated maximal water hammer pressure, a three-dimensional finite element model is established by ABAQUS software. In calculation, the contact elements are used to simulate the feature of frictional contact between steel liner and surrounding concrete, and the concrete damage plasticity constitutive model is adopted to describe the tensile characteristic of concrete. At last, according to the results of simulation, the damage range and level are investigated.

Application of Finite Element Method for Reinforced Concrete Ribbed Arch Aqueduct Structure Analysis

2011 ◽  
Vol 101-102 ◽  
pp. 447-450
Author(s):  
Wei Xie
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Water Pressure ◽  
Force Analysis ◽  
Distribution Law ◽  
Earthquake Effect ◽  
Stress And Deformation ◽  
Main Arch ◽  
Element Method

Reinforced concrete ribbed arch aqueduct’s bent is arranged symmetrically on the main arch, load which is transferred from bent to main arch is more homogenous. It can improve force conditions of main arch, and aqueduct is arranged on the bent. That also has the function of longitudinal beam. This paper adopts finite element method to carry out force analysis for Guanping reinforced concrete ribbed arch aqueduct, considering aqueduct weight, water pressure and earthquake effect, etc. researching stress and deformation distribution law of reinforced concrete ribbed arch aqueduct.

Numerical Simulation Analysis for Scroll of Scroll Compressor Based on ABAQUS

2014 ◽  
Vol 488-489 ◽  
pp. 1047-1051
Author(s):  
Qing Qian Zheng ◽  
Bin Yang ◽  
Ning Chen ◽  
Hui Min Yang ◽  
Min Hu
Keyword(s):  
Numerical Simulation ◽  
Stress Distribution ◽  
Thermal Deformation ◽  
Vortex Flow ◽  
Simulation Analysis ◽  
Temperature Load ◽  
Stress And Deformation ◽  
Finite Method ◽  
Abaqus Software ◽  
Main Factor

In this paper, the finite method is applied and ABAQUS software is used, the vortex flow field is loaded as boundary condition of wraps. The stress and deformation in scroll under the action of gas pressure, temperature load and both of them is analyzed, the stress distribution and deformation of wraps in different shaft rotation angles is discussed, the stress distribution and deformation discipline of wraps are also respectively obtained. The results show that the overall stress and deformation in scroll are the largest when compression chamber is moving near the vent position and the thermal deformation is the main factor of affecting the overall deformation of scroll.

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