Reliability Studies on Concrete Filled FRP Tube Columns Using Different Design Code Models

2013 ◽  
Vol 405-408 ◽  
pp. 735-739
Author(s):  
Ying Wu Zhou ◽  
Li Li Sui ◽  
Feng Xing
Keyword(s):  
Tensile Strength ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Reliability Index ◽  
Concrete Strength ◽  
Design Codes ◽  
Design Code ◽  
Reliability Study ◽  
Simulation Results ◽  
Frp Tube

The paper presents an in-deep reliability study on concrete filled FRP tube columns using four well-known design codes which include the ACI 4402R-08, the CNR-DT200, UK code (TR55) , and the Chinese code. Monte Carlo method is utilized to calculate the reliability index of the column. The simulation results reveal that the reliability index depends heavily on the design code and the ACI 4402R-08 design code is found to be the most reliable one for the design of concrete filled FRP tube columns. The variation of the unconfined concrete strength has remarkable influences on the reliability of the column while the variation of the FRP tensile strength can hardly affect the reliability. Consequently, it is concluded that the partial safety factor for concrete or the FRP proposed in existing design codes may be suitably enhanced in order to make up the reliability loss due to the increment of the variation of concrete.

Evaluation Technique With MCNP for Temperature Dependent Problems

2010 ◽  
Author(s):  
Hiroyuki Fujime ◽  
Shinji Abe ◽  
Kazuya Yamaji ◽  
Daisuke Sato ◽  
Hideki Matsumoto
Keyword(s):  
Monte Carlo ◽  
Cross Sections ◽  
Monte Carlo Calculation ◽  
Design Codes ◽  
Design Code ◽  
Temperature Dependent ◽  
Validation And Verification ◽  
The World ◽  
Profile Changes ◽  
Complex Temperature

Monte Carlo calculation has come to be used as reference solutions instead of experiments in nuclear design code validation and verification (V&V), although comparisons with measurements are still indispensable for V&V in nuclear design. MCNP [1] is one of the most famous Monte Carlo codes widely used in the world. Many reference results are given for the analyses of critical experiments. When using the use MCNP calculations for validations of commercial design codes, we will face to a problem of lacking temperature dependent cross-sections. The cross-sections can be generated by the NJOY code [2]. However, if the model has complex temperature distribution, many NJOY calculations are necessary. Besides, if the temperature profile changes with fuel power and so on, many NJOY calculations have to be performed again and again. These back and forth procedures make us give up using MCNP for commercial LWR calculations. In order to solve this problem, we propose an easy approximation to solve the temperature problems using MCNP. Note that our technique does not require any code modifications.

Local Ice Loads on the Sakhalin-II Project Structures: Probability Analysis and Comparison by Existing Design Codes

2016 ◽  
Author(s):  
Olga A. Sabodash
Keyword(s):  
Monte Carlo ◽  
Comparative Analysis ◽  
Monte Carlo Method ◽  
Engineering Design ◽  
Probabilistic Analysis ◽  
Design Codes ◽  
Local Pressure ◽  
Preliminary Results ◽  
Ice Loads ◽  
Scale Data

In the study the probabilistic modeling of local ice loads and pressures on wide structure has been carried out. Probabilistic analysis has traditionally been focused on distribution of their maximum values. The “Molikpaq” (PA-A) ice-class platform for “Sakhalin-II” project is considered as an example. The input parameters were modelled by Monte-Carlo method taking into account of full-scale data in the Piltun-Astokhskoe field during 1989÷2002 ice seasons. A comparative analysis of local ice loads and pressures on wide structure has been made on the basis of the Russian and international design codes, standards and recommendations. The obtained local pressure values were compared with public available data collected on the “Molikpaq” (PA-A) platform. Some preliminary results and discussions are presented. Recommendations on the local ice loads and pressures for engineering design of structures on the Sakhalin offshore have been done.

Reliability Analysis on Slag Concrete Brick Masonry Compressed Based on Monte-Carlo Method

2014 ◽  
Vol 651-653 ◽  
pp. 1227-1230
Author(s):  
Yi Zheng ◽  
Wei Shi Xiong ◽  
Fei Gao ◽  
Xiao Jun Shen ◽  
Zhao Jun Qiu ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Reliability Analysis ◽  
Reliability Index ◽  
Brick Masonry ◽  
New Materials ◽  
Clay Brick ◽  
Concrete Masonry ◽  
Dead Loading ◽  
Change Tendency

Slag concrete brick, as a kind of new materials utilizing wastes, is one kind of subsistent for clay brick. However, research on Slag concrete brick is very few, which restrains applying for slag concrete brick. By analyzing the reliability of the compress specimen with slag concrete brick masonry, the resistant statistic parameters are obtained and the computer probabilistic formula is established. Its reliability based on Monte-Carlo Method is calculated by means of Matlab. The result calculated is reasonable and reliable, which meets the requirement in rules. With the increasing of radio of live loading to dead loading, change tendency of reliability index of slag concrete masonry is that both sides are low and center is tall, and maximum appears between 0.5 and 1.0.

scholarly journals Neutronic modeling of a subcritical system with corium particles and water (from international benchmark)

2020 ◽  
Vol 6 (3) ◽  
pp. 155-160
Author(s):  
Anton D. Smirnov ◽  
Ekaterina V. Bogdanova ◽  
Pavel A. Pugachev ◽  
Ivan S. Saldikov ◽  
Mikhail Yu. Ternovykh ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Scientific Community ◽  
Structural Elements ◽  
The Monte Carlo Method ◽  
Fukushima Daiichi ◽  
Simulation Results ◽  
Subcritical System ◽  
Good Agreement

After the accident at the Fukushima Daiichi NPP, the attention of the scientific community is riveted on how the consequences are being eliminated. Removing corium – a lava-like resolidified mixture of nuclear fuel with other structural elements of the reactor – remains the most difficult task, the solution of which can take several decades. It is extremely important to exclude the occurrence of any emergency processes during the removal of corium. The purpose of this work was to solve a coordinated hydrodynamic and neutronic problem characterized by a large number of randomly oriented and irregularly located corium particles in water as part of the development of a benchmark for this class of problems. Monte Carlo-based precision codes were used to perform a neutronic analysis. The positions of corium particles were determined from the numerical simulation results. The analysis results obtained using the codes involved showed good agreement for all the states considered. It was shown that the modern neutronic codes based on the Monte Carlo method successfully cope with the geometric formation and solution of the problem with a nontrivial distribution of corium particles in water. The results of the study can be used to justify the safety of corium handling procedures, including its extraction from a damaged power unit.

Effectiveness Calculation of Multiple Rounds Simultaneous Impact Shooting Method Based on Monte Carlo Method

2013 ◽  
Vol 397-400 ◽  
pp. 2459-2463 ◽  
Author(s):  
Xin Jun Hu ◽  
Hang Yu Wang
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Shooting Method ◽  
Moving Targets ◽  
Simultaneous Impact ◽  
The Monte Carlo Method ◽  
Naval Gun ◽  
Simulation Results

Multiple Rounds Simultaneous Impact shooting method (MRSI) improved the hit projectiles greatly.It will effect the shooting effectiveness of Large Caliber Naval Gun weapon system.Based on the analysis of the priciple of Monte Carlo method,the consistent of shooting errors was given.Then built the configuration rules of aiming points,and given the Optimal configuration.Also the Monte Carlo method was adopt to calculate the shooting effectiveness of Large Caliber Naval Gun weapon system.The simulation results showes that MRSI shooting method could attack the moving targets effectively.

Laser Localization of Autonomous Vehicle Using an Improved Particle Filter

2012 ◽  
Vol 629 ◽  
pp. 873-877
Author(s):  
Wen Jian Ying ◽  
Fu Chun Sun
Keyword(s):  
Monte Carlo ◽  
Markov Chain ◽  
Markov Chain Monte Carlo ◽  
Monte Carlo Method ◽  
Particle Filter ◽  
Probability Density ◽  
Autonomous Vehicle ◽  
Posteriori Probability ◽  
Localization Precision ◽  
Simulation Results

This article presents an improved Rao-Blackwellized particle filter to overcome particles degeneracy phenomenon and acquire the better localization precision of the autonomous vehicle. The joint posteriori probability density is given that being correlative with the position and pose of the autonomous vehicle and the mark characters of the map. The algorithm utilizes a Markov chain Monte Carlo method with the sampling particle of the target to the resample mechanism of the Rao-Blackwellized particle filter. Simulation results show that the improved algorithm is valid.

Reliability Assessments of Concrete Filled FRP Tube Columns

2013 ◽  
Vol 405-408 ◽  
pp. 731-734
Author(s):  
Ying Wu Zhou ◽  
Feng Xing ◽  
Li Li Sui
Keyword(s):  
Safety Factor ◽  
Coefficient Of Variation ◽  
Reliability Index ◽  
Concrete Strength ◽  
Reliability Design ◽  
Partial Safety Factor ◽  
Highly Sensitive ◽  
Partial Safety Factors ◽  
Reliability Assessments ◽  
Frp Tube

This paper has investigated the reliability of concrete filled FRP tube columns using the FRP confined concrete theory developed recently by the authors. The reliability index of the column is assessed by Monte Carlo method. The importance of the use of partial safety factors of FRP and concrete in the reliability design of concrete filled FRP tube columns is studied. The results indicate that the reliability index of concrete filled FRP tube columns increases remarkably as the FRP partial safety factor increased. It is concluded that the FRP partial safety factor is independent on the coefficient of variation of FRP strength but is highly sensitive to the coefficient of variation of concrete strength especially in the case of low confinement ratio. Considering the actual situation in engineering applications, to reach a target reliability index of 3.5, a partial safety factor of 1.4 is finally recommend for both FRP and concrete.

Optimal Design and Simulation on the Major Linkage Parameters of a Harvesting Manipulator

2010 ◽  
Vol 44-47 ◽  
pp. 651-655
Author(s):  
Yu Jie Cui ◽  
Jian Ning Hua ◽  
Pu Shi
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Optimal Design ◽  
Optimization Design ◽  
Robotic Manipulators ◽  
The Monte Carlo Method ◽  
Simulation Results ◽  
Optimization Methodology

A general optimization methodology for the optimal design of robotic manipulators is presented and illustrated by its application to a harvesting manipulator. The optimization design of the manipulator framework and structure is made according to the tomato' s growth circumstance and distribution space.The workspace of the manipulator is carried out and simulated through the Monte Carlo method. Simulation results show that the manipulator with 4 degree- of- freedoms meets the expectations for picking tomato in greenhouse. The rationality of the structure and frame is validated.

Reliability Estimating of Existing Bridge Using Dynamic Monte-Carlo Method

2010 ◽  
Vol 163-167 ◽  
pp. 3156-3160
Author(s):  
Ke Ke Peng ◽  
Pei Yan Huang
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Reliability Index ◽  
State Variables ◽  
Arch Bridge ◽  
Reliability Indices ◽  
Damage Probability ◽  
Dynamic Monte Carlo ◽  
Cfst Arch Bridge ◽  
Safe Working

Based on time-dependent reliability theory, intermediate working state is considered, combining with current specifications, concrete filled steel tubular (CFST) arch bridge is discussed as a case, determination principle of three-stage mode is given. The direct correspondence from reliability indices to working states is made clear consequently. Introducing state variables, dynamic Monte-carlo method is presented. Basic formulas of failure probability and damage probability are derived by variable time increment method. The bridge is an CFST arch bridge with 83.6 meter-span, which operated for 10 years. According to test result, dynamic Monte-carlo method is used to estimate the reliability of this bridge. The analysis result shows that, in the tenth year, both damage reliability index and failure reliability index are above target reliability index. The example bridge is in safe working state at present. This conclusion is consistent with the facts.

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