scholarly journals Numerical Simulation Analysis of Combined Seismic Response for Rock-Lining-Water in Hydraulic Tunnel

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Guoqing Liu ◽  
Yanhong Zhang ◽  
Ming Xiao
Keyword(s):  
Numerical Simulation ◽  
Seismic Response ◽  
Simulation Analysis ◽  
Large Diameter ◽  
Water Diversion ◽  
Seismic Stability ◽  
Central Difference ◽  
Element Analysis ◽  
Internal Water ◽  
Lining Structure

In order to explore the influence of internal water on the seismic response of hydraulic tunnel, the combined mechanical analysis models of multimaterial including surrounding rock, lining structure, and internal water are built. Based on the explicit central difference method, the dynamic finite element analysis methods for rock, lining, and water are discussed, respectively. The dynamic contact force method is used to simulate the rock-lining contact interaction, and the arbitrary Lagrange-Euler (ALE) method is used to simulate the lining-water coupling interaction. Then a numerical simulation analysis method for combined seismic response of rock-lining-water system in hydraulic tunnel is proposed, and the detailed solving steps are given. This method is used to study the seismic stability characteristics of the water diversion tunnel in a hydropower station, and the displacement, stress, and damage failure characteristics of the lining structure under the conditions of no water, static water, and dynamic water are comparatively analyzed. The results show that the hydrostatic pressure restricts the seismic response of the lining, while the hydrodynamic pressure exacerbates its seismic response and leads to damage, separation, and slip failure appearing on the haunch, which can provide a scientific reference for the seismic design of hydraulic tunnel with high water head and large diameter.

Finite Element Analysis of Z-Shaped Pipe in the Directly Buried Heat-Supply Pipeline with Large Diameter

2014 ◽  
Vol 721 ◽  
pp. 96-99
Author(s):  
Ming Qiang Li ◽  
Fei Wang ◽  
Guo Wei Wang ◽  
Yong Gang Lei
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Boundary Conditions ◽  
Engineering Design ◽  
Heat Supply ◽  
Simulation Analysis ◽  
Large Diameter ◽  
Ansys Software ◽  
Element Analysis

In order to improve Z-shaped pipe in the directly buried heat-supply pipeline with large diameter stress calculations, guiding the engineering design when the short arm length is less than two times the elastic arms length. The author used ANSYS software to numerical simulation analysis on Z-shaped pipe in the directly buried heat-supply pipeline of DN800, DN1000, DN1200, when the long arm length of 50 m, 100 m, 150 m, and the short arm length from two times to one times of the elastic arm length. Applying boundary conditions in different models with the short arm length shortens the process to Z-shaped pipe of the elbow stress. For Z-shaped pipe in the directly buried heat-supply pipeline the short arm from two times to one times of the elastic arm length, the elbow’s stress value is the minimum when the short arm length is 1.2 times of the elastic arm length. This article breaks the specification limits on the short arm length, improving the flexibility of directly buried heat-supply pipeline with large diameter, reducing the difficulty of construction, and it’s important for guiding the actual project.

Numerical Simulation of Galloping for Iced Quad-Bundled Conductor

2014 ◽  
Vol 1025-1026 ◽  
pp. 955-958 ◽  
Author(s):  
Jun Jie Shi ◽  
Ya Nan Li ◽  
Li Qin
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Simulation Analysis ◽  
Time Integration ◽  
Vertical Vibration ◽  
Analysis Model ◽  
Element Analysis ◽  
Beam Elements ◽  
Time Integration Method ◽  
Wake Interference

The theoretical study of galloping can effectively promote anti-galloping techniques. Cable element is utilized to imitate the bundled conductor, and beam elements are used to simulated the spacers, established galloping finite element analysis model which can consider sub-conductors wake interference. The finite element equation was solved by time integration method and the calculation program was compiled by MATLAB. Through numerical simulation analysis, compared the dancing in the case of considering the effect of the sub-conductor wake and ignoring the effect of the sub-conductor wake. The results showed that considering the effect of the wake on aerodynamic loads has a greater vertical vibration amplitude. This method can provide reference for the study of prevention technology on dancing.

Numerical Simulation Analysis of Bearing Characteristics on Super-Large Diameter Rock Socketed Pile

2014 ◽  
Vol 580-583 ◽  
pp. 432-435 ◽  
Author(s):  
Cheng Zhong Gong ◽  
Chun Lin He ◽  
Ming Xing Zhu
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Large Diameter ◽  
Flow Analysis ◽  
Test Method ◽  
Main Stress ◽  
Pile Cap ◽  
Pile Caps ◽  
S Curve ◽  
Stress Flow

Wujiang Bridge is located on the Wujiang River in Chongqing Province in China. Based on test method of numerical simulation, the bearing characteristics of this large-diameter rock-socket pile with super-thick pile caps have been analyzed, including pile foundation load-bearing characteristics, pile-soil load sharing, and stress flow analysis of thick pile caps. The results indicated that Q-s curve of this kind of pile is approximate to linear. Under the action of ultimate load, the main load was supported by pile end résistance. And according to main stress distribution of pile cap, there is an obvious spatial truss effect phenomenon in it.

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.

The Seismic Performance Simulation Analysis on the Irregular Structure of the Castle Hotel of Dalian

2013 ◽  
Vol 663 ◽  
pp. 80-86
Author(s):  
Hai Qing Liu ◽  
Ming Ji Ma ◽  
Gui Jun Wang
Keyword(s):  
Finite Element ◽  
Seismic Response ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Time History ◽  
Element Model ◽  
Theoretical Research ◽  
Element Analysis ◽  
Disaster Experience ◽  
Irregular Structure

More and more irregular structure appears in people's lives, while the theoretical research and disaster experience show that the irregular structure in the earthquake will produce translation and torsion coupled spatial vibration, and sometimes it will cause very serious consequences. Being based on the practical engineering -the Castle Hotel of Dalian, this text makes use of finite element analysis software--- ANSYS. By analyzing the dynamic characteristics and seismic response, we get the self-vibration characteristics of the structure and the time history curve of top level displacement and acceleration of the structure under the effect of earthquake forces. The calculation results indicate that it is effective and reasonable to set up three-dimensional finite element model used for the analyzing of seismic response by ANSYS.

Numerical Simulation Analysis for Foundation Settlement Sensitivity on LiShuiGou Aqueduct of ShiMen Reservoir

2011 ◽  
Vol 71-78 ◽  
pp. 1601-1604
Author(s):  
Di Zhang
Keyword(s):  
Numerical Simulation ◽  
Design Theory ◽  
Simulation Analysis ◽  
Design Method ◽  
Large Diameter ◽  
Orthogonal Experimental Design ◽  
Foundation Settlement ◽  
Pile Diameter ◽  
Constitutive Mode ◽  
Pile Length

The foundation of LiShuiGou Aqueduct of ShiMen Reservoir is composed of long-short and large diameter piles, with great diameter and length differences between these new and old piles. Numerical simulation of the FEM software ADINA and the orthogonal experimental design theory are applied to explore the sensitivity of long-short pile foundation settlement, under different pile length, pile diameter, pile space, and soil constitutive model, with foundation settlement as the evaluation index. The results show that the descending order of the sensitivity of four factors is: pile length > pile diameter > pile space > soil constitutive mode. Some scientific and rational approaches and basis are consequently provided to explore the most effective reinforcement measures and design method for long-short and large diameter piles.

Numerical Simulation Analysis of a New Pressured Multi-Branch Bored Pile

2011 ◽  
Vol 243-249 ◽  
pp. 3167-3171 ◽  
Author(s):  
Ming Yi Zhang ◽  
Hai Lei Kou ◽  
Wei Zhang
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Cost Effective ◽  
Vertical Load ◽  
Element Analysis ◽  
Bored Pile ◽  
Tip Resistance ◽  
Technology Focus ◽  
Lateral Friction ◽  
End Bearing Pile

Pressured multi-branch bored pile is a new pile on the basis of squeezed branch reaming pile improved, it is a new pile technology focus on many advantages of the static pile, driven cast-in-place pile, belled pile and multi-branch bored pile. Pressured multi-branch bored pile has high bearing capacity, small settlement, cost-effective advantages of better. Numerical simulation of pressured double-branch pile on the vertical compression with ANSYS finite element analysis software obtained the alternate variation of the lateral friction and tip resistance of pile under the vertical load. Many branch of pile constitute multi-pivot friction and end-bearing pile, the bearing branch bear mainly bear vertical load, above branch force greater than the following branch. It is proposed recommended value about the vertical critical spacing of branch and the level spacing of pressured branch pile.

Numerical Simulation of Roadway Deformation of Different Cutting Aperture

2013 ◽  
Vol 340 ◽  
pp. 892-895
Author(s):  
Xue Min Gong ◽  
Jia Yong Zhang ◽  
Li Wen Guo
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Wall Rock ◽  
Rock Stress ◽  
Analysis Software ◽  
Pressure Relief ◽  
Element Analysis ◽  
Gas Seepage ◽  
The Face ◽  
Roadway Deformation

Using ANSYS finite element analysis software, the crushing effect and wall rock deformation of a small high-pressure jet impacting coal were given numerical simulation analysis. It verified that impacting increased exposed area of coal in punch, providing conditions for pressure relief of internal coal seam and gas seepage. through comprehensive analysis of the rock stress and coal displacement of different roadway models after undercutting, it was determined that aperture size was 4/15 or so of roadway floor length, thus roadway fissures developed full, and maintained rock integrity, in favor of speeding up the face driving.

Seismic Response of Superposed Wall Panel with Different Edge Components

2010 ◽  
Vol 163-167 ◽  
pp. 1074-1079 ◽  
Author(s):  
Xun Chong ◽  
Xian Guo Ye ◽  
De Cai Wang ◽  
Xing Lian
Keyword(s):  
Seismic Response ◽  
Failure Modes ◽  
Simulation Analysis ◽  
Wall Panel ◽  
Element Analysis ◽  
Edge Elements ◽  
Inelastic Analysis ◽  
The Finite Element Analysis ◽  
Reversed Cyclic ◽  
Core Concrete

Seismic performance of a kind of superposed wall, which is composed of two precast panels and the cast- in- place core concrete, was studied in the paper. Two groups of superposed wall units with different edge elements were constructed and tested under quasi- static reversed cyclic loading. The strength, stiffness, ductility, energy dissipation and failure modes of the walls under lateral load were investigated, and the influence of different edge elements to the seismic response of the wall panels was discussed. Moreover, numerical simulation analysis was conducted applying multi- spring (MS) model with the finite element analysis procedure CANNY. Results of the inelastic analysis were compared with the experimental ones to validate the reasonability of the numerical model and evaluate the seismic response of superposed walls further.

Finite Element Analysis on the Directly Buried Heating Bent Pipeline with Many Break Angles

2013 ◽  
Vol 842 ◽  
pp. 415-419
Author(s):  
Bao Xian Qian ◽  
Fei Wang ◽  
Guo Wei Wang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Simulation Analysis ◽  
Design Method ◽  
Engineering Practice ◽  
Analysis Method ◽  
Element Analysis ◽  
Current Design ◽  
Practical Engineering

In order to get the optimal design scheme of a directly buried heating bent pipeline with many fold angles in a certain practical engineering, this paper simulated the pipeline by the ANSYS finite element analysis software.Through applying different boundary conditions to the model, the stress was analyzed, the destroy forms of the pipeline and the positions of stress danger points were determined,and the fatigue life was checked according to BS EN. Compared with the current design method,adopting numerical simulation analysis method has greatly reduced the number of the usage of compensators and fixed piers, broke through the restrictions for larger fold angle in the standard,and at the same time, it has reduced the construction difficulties and the engineering investment,improved the reliability of the network,this paper has guiding significance to the engineering practice.

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