Application of contact element method in the numerical simulation of thermal stress

2009 ◽  
Vol 3 (4) ◽  
pp. 421-425 ◽  
Author(s):  
Hui Li ◽  
Jian-song Shi ◽  
Rong-rong Zong ◽  
Xiao-xia Wang
Keyword(s):  
Numerical Simulation ◽  
Thermal Stress ◽  
Contact Element ◽  
Contact Element Method ◽  
Element Method

Study and Application on Computational Methods for Ultimate Bearing Capacity of Single Pile

2008 ◽  
Vol 400-402 ◽  
pp. 329-334
Author(s):  
Ze Liang Yao ◽  
Zhen Jian ◽  
Guo Liang Bai
Keyword(s):  
Bearing Capacity ◽  
Computational Methods ◽  
Ultimate Bearing Capacity ◽  
Contact Element ◽  
Computational Formula ◽  
Single Pile ◽  
Foundation Design ◽  
Experiment Method ◽  
Contact Element Method ◽  
Element Method

It is difficult and important to accurately calculate single pile ultimate bearing capacity during pile foundation design. Typical computational methods on single pile ultimate bearing capacity are contrastively analyzed in this paper. Contact element method on single pile ultimate bearing capacity is relatively accurate and economical, but it isn’t used in practical projects until now because its computational process is complicated. 343 different single pile ultimate bearing capacities are calculated with the contact element method in order to study a simple computational formula based on the contact element method. All data calculated are analyzed with a linear recursive multi-analysis program which is programmed with Fortran90. A simple computational formula on the contact element method is presented based on the analysis results. The simple computational formula, the experiential formula in the code, the contact element method and the static load experiment method are respectively used to calculate single pile ultimate bearing capacity in two practical projects in order to test the simple computational formula. The results show that the simple computational formula is relatively accurate. Some advice is presented based on the analysis results.

Numerical Simulation of Fracture Process of Concrete Dam due to Freezing and Thawing with Finite Element Method

2007 ◽  
Vol 348-349 ◽  
pp. 941-944
Author(s):  
Li Juan Cao ◽  
Shou Ju Li ◽  
Zi Chang Shangguan
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Thermal Stress ◽  
Cold Climate ◽  
Temperature Fields ◽  
Stress Fields ◽  
Freezing And Thawing ◽  
Concrete Dam ◽  
Element Method

Freezing and thawing damage is one of the major problems of concrete dams in cold climate. Cracking and splitting are the most common results of freezing and thawing deterioration in concrete dam. The cracking problem owing to freezing and thawing was investigated by making sue of finite element methods. The interpretation of the mechanism of failure was also given. In order to compute the thermal stress fields of concrete dam caused by freezing and thawing, the temperature changes versus seasons is determined according to measured data. The temperature fields of concrete dam versus seasons are simulated by using finite element method. Basing on the computational results of the temperature fields of concrete dam, the thermal stress fields are calculated numerically. The researches show that the first principal stress of concrete dam at downstream surface can exceed the tensile strength of concrete material. The numerical simulation results of fractured regions of concrete dam agreed with practical observed data.

Computer simulation of landslides by the contact element method

2006 ◽  
Vol 32 (4) ◽  
pp. 434-441 ◽  
Author(s):  
Jiang Xiaoyu ◽  
Qiao Jianping ◽  
Wang Chenghua ◽  
Zhao Yu
Keyword(s):  
Computer Simulation ◽  
Contact Element ◽  
Contact Element Method ◽  
Element Method

scholarly journals USING THE NEW FIBRE CONTACT ELEMENT METHOD FOR DYNAMIC STRUCTURAL ANALYSIS

2015 ◽  
Vol 7 (1) ◽  
pp. 24-38
Author(s):  
João M. C. Estêvão ◽  
Ana S. Carreira
Keyword(s):  
Structural Analysis ◽  
Dynamic Response ◽  
Nonlinear Problems ◽  
Contact Element ◽  
Elastic Response ◽  
Reinforced Concrete Frame ◽  
Structural Dynamic ◽  
Concrete Frame ◽  
Contact Element Method ◽  
Element Method

In literature, there are many methods proposed for structural analysis based on discrete element formulations, mainly for nonlinear problems. One of these new methods is the Fibre Contact Element Method (FCEM). Many of these methods have been used for structural dynamic analysis problems. However, there are some questions about their precision in capturing the dynamic elastic response of structures when comparing to methods based on continuous models, like the well known Finite Element Method (FEM). For this reason, the results obtained with FCEM were extensively compared with FEM results and with laboratorial tests, to better understand the performance of this new method in capturing the elastic dynamic response of structures. Results indicate that this kind of discrete methods are able to determine the vibration modes of a structure with equal or better precision level than the obtained with FEM. FCEM was also used to capture the dynamic response of a reinforced concrete frame with infill walls, as a way to show the method capabilities in reproducing the dynamic behaviour of structures that have an almost continuous mass distribution.

Determination on Interlayer Separation Threshold of Complex Roof with Mechanics Properties

2013 ◽  
Vol 303-306 ◽  
pp. 2908-2913
Author(s):  
De Yi Wu ◽  
Liu Yang Nie
Keyword(s):  
Normal Stress ◽  
Contact Element ◽  
Contact Theory ◽  
Tension Stress ◽  
Deep Mining ◽  
Separation Threshold ◽  
Nonlinear Contact ◽  
Contact Element Method ◽  
Element Method

In order to determine interlayer separation threshold and separation stability of complex roof, distribution of interlayer separation was analyzed in different conditions by a contact element method based on nonlinear contact theory in ANSYS program. The conclusion was drawn that normal stress was tension stress in the center of construction surface in deep mining and it could be considered as interlayer separation threshold of complex roof.

scholarly journals Numerical simulation on coal loading process of shearer drum based on discrete element method

2021 ◽  
pp. 014459872110135
Author(s):  
Zhen Tian ◽  
Shuangxi Jing ◽  
Lijuan Zhao ◽  
Wei Liu ◽  
Shan Gao
Keyword(s):  
Numerical Simulation ◽  
Discrete Element Method ◽  
Loading Rate ◽  
Low Cost ◽  
Element Model ◽  
Discrete Element ◽  
Helix Angle ◽  
Loading Process ◽  
Coal Particles ◽  
Element Method

The drum is the working mechanism of the coal shearer, and the coal loading performance of the drum is very important for the efficient and safe production of coal mine. In order to study the coal loading performance of the shearer drum, a discrete element model of coupling the drum and coal wall was established by combining the results of the coal property determination and the discrete element method. The movement of coal particles and the mass distribution in different areas were obtained, and the coal particle velocity and coal loading rate were analyzed under the conditions of different helix angles, rotation speeds, traction speeds and cutting depths. The results show that with the increase of helix angle, the coal loading first increases and then decreases; with the increase of cutting depth and traction speed, the coal loading rate decreases; the increase of rotation speed can improve the coal loading performance of drum to a certain extent. The research results show that the discrete element numerical simulation can accurately reflect the coal loading process of the shearer drum, which provides a more convenient, fast and low-cost method for the structural design of shearer drum and the improvement of coal loading performance.

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