Nonlinear Analysis of Jointed Concrete Pavements

1998 ◽  
Vol 1629 (1) ◽  
pp. 50-57 ◽  
Author(s):  
M. Asghar Bhatti ◽  
Idelin Molinas-Vega ◽  
James W. Stoner
Keyword(s):  
Nonlinear Analysis ◽  
Element Model ◽  
Concrete Slabs ◽  
Relative Deformation ◽  
Concrete Pavements ◽  
Fatigue Damage Accumulation ◽  
Repetitive Loading ◽  
Using Data ◽  
Improved Model ◽  
Jointed Concrete Pavements

A finite element model for nonlinear analysis of jointed concrete pavements is presented. The model allows for nonlinear representation of the properties of concrete, both in compression and in tension. It also accounts for the behavior under cyclic loading considering the nonlinear fatigue damage accumulation in concrete. An improved model accounting for the relative deformation between the dowel bars and the concrete slabs is presented to analyze pavement slabs connected with dowels. The sub-grade model is capable of representing pumping of the fine material with repetitive loading. Limited validation of the model is presented using data available in the literature.

Corner Stress Analysis of Jointed Concrete Pavements

1996 ◽  
Vol 1525 (1) ◽  
pp. 44-56 ◽  
Author(s):  
Ying-Haur Lee ◽  
Ying-Ming Lee
Keyword(s):  
Finite Element ◽  
Prediction Models ◽  
Projection Pursuit ◽  
Computation Time ◽  
Element Model ◽  
Concrete Pavements ◽  
Finite Element Program ◽  
Bending Stresses ◽  
Stress Prediction ◽  
Jointed Concrete Pavements

Because corner breaks are one of the major structural distresses in jointed concrete pavements, the ILLI-SLAB finite-element program was used to analyze the critical corner stresses of concrete pavements under different loading conditions. Subsequently, the effects of a finite slab size, different gear configurations, a widened outer lane, a tied concrete shoulder, and a second bonded or unbonded layer were considered. Based on the principles of dimensional analysis and experimental designs, the dominating mechanistic variables were carefully identified and verified. The resulting ILLI-SLAB stresses were compared with theoretical Westergaard solutions to develop adjustment (multiplication) factors. A new regression technique (projection pursuit regression) was used to develop prediction models to account for these theoretical differences and to instantly estimate the critical corner stresses. A practical application example illustrating the use of the prediction models was also provided and carefully verified using the ILLI-SLAB program. The research findings can be used practically for various designs and analyses of jointed concrete pavements based on theoretical considerations. Not only can the use of these stress prediction models reduce the possibility of obtaining incorrect results due to the improper use of the finite-element model, but it can also reduce the complicated computation time significantly. Furthermore, the critical bending stresses can be conveniently, accurately, and—best of all—instantly calculated through the use of these stress prediction models.

Nonlinear Analysis of R.C Beams Strengthened with CFRP

2012 ◽  
Vol 166-169 ◽  
pp. 1517-1520
Author(s):  
Wen Sheng Li ◽  
Kai Wang
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Nonlinear Analysis ◽  
Element Model ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Element Analysis ◽  
Flexural Performance ◽  
Reinforced Polymer ◽  
Flexural Resistance

In order to study on the flexural performances of beams strengthened with external bonded carbon fiber reinforced polymer（CFRP）sheets, nonlinear analysis is carried out by using software ANSYS. The results show that a reasonable finite element model, using a reasonable solution strategy can be a good simulation of CFRP flexural performance of reinforced concrete beams, and finite element analysis results with the experimental results have good consistency .The beams reinforced by carbon fiber polymer，the capacity of flexural resistance increased with the numbers of carbon fiber paste sheets, reinforced components of flexural capacity significantly improved, but the extent of its increase is not proportional with the numbers of carbon fiber paste sheets.

Аpplication of the mathematical model of human torso for modeling abbreval influence in wound ballistics

2020 ◽  
Vol 22 (3) ◽  
pp. 132-139
Author(s):  
A. V. Denisov ◽  
M. D. Stepanov ◽  
N. A. Haraldin ◽  
A. V. Stepanov ◽  
A. I. Borovkov ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Element Model ◽  
Mechanical Action ◽  
Calculation Model ◽  
Calculation Results ◽  
Automated Processing ◽  
Original Calculation ◽  
Using Data ◽  
The Mathematical Model ◽  
Selection Of

Abstract. In the work, a review of scientific articles on the behavior of tissues and organs of the human body under local mechanical effects on it, as well as a description of the physico-mechanical properties of biological materials. The selection of mechanical behavior for each biological material as part of a mathematical model of the human torso was carried out, its finite element model was created, validation experiments were modeled using data presented in the literature. An original calculation model of a human torso with a tuned interaction of organs with each other was developed. Contact interaction parameters are determined. The developed computational model of a human torso was verified based on data from open sources for an experiment with mechanical action by a cylindrical impactor. An algorithm for processing pressure and acceleration graphs has been implemented in order to obtain tolerance curves. A specialized modular program has been created for the automated processing of calculation results and the output of the main results. 42 numerical tests were carried out simulating the entry of a steel ball into each of 21 zones for power engineers of 40 and 80 J. According to the results of the tests for each organ, pressure and acceleration tolerance curves were obtained, animations of the behavior of organs under shock were created, visualization of the pressure field propagation in organs was obtained torso.

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