scholarly journals Deterministic and Probabilistic Analysis of NPP Communication Bridge Resistance Due to Extreme Loads

2014 ◽  
Vol 14 (2) ◽  
pp. 54-63 ◽  
Author(s):  
Juraj Králik ◽  
Juraj Králik
Keyword(s):  
Probabilistic Analysis ◽  
Probability Analysis ◽  
Steel Bridge ◽  
Bridge Structure ◽  
Advantages And Disadvantages ◽  
Extreme Loads ◽  
Safety And Reliability ◽  
Bridge Resistance

Abstract This paper presents the experiences from the deterministic and probability analysis of the reliability of communication bridge structure resistance due to extreme loads - wind and earthquake. On the example of the steel bridge between two NPP buildings is considered the efficiency of the bracing systems. The advantages and disadvantages of the deterministic and probabilistic analysis of the structure resistance are discussed. The advantages of the utilization the LHS method to analyze the safety and reliability of the structures is presented

Failure Probability of NPP Communication Bridge under the Extreme Loads

2014 ◽  
Vol 617 ◽  
pp. 81-85 ◽  
Author(s):  
Juraj Králik ◽  
Juraj Kralik
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Input Data ◽  
Steel Bridge ◽  
Advantages And Disadvantages ◽  
Extreme Loads ◽  
Load Factors ◽  
Extreme Load ◽  
Safety And Reliability

Safety and reliability of the communication steel bridge of the nuclear power plant under extreme loads is considered in this paper. The extreme load from the wind and the earthquake is defined for the probability of exceedance 10-4 per year on the base of the last results from the investigation in Slovakia. The deterministic and the probabilistic assessments to verify the safety and reliability of the structure are presented. The uncertainties of the input data and the calibration of the load factors are discussed. The advantages and disadvantages of the probabilistic analysis are discussed. The advantages of the utilization the LHS method to analyze the safety and reliability of the structures is presented.

Recent Patents on Valve Mechanism Device

2020 ◽  
Vol 13 (3) ◽  
pp. 230-241
Author(s):  
Ye Dai ◽  
Hui-Bing Zhang ◽  
Yun-Shan Qi
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Flow Direction ◽  
Research Progress ◽  
Valve Mechanism ◽  
Advantages And Disadvantages ◽  
Valve Structure ◽  
Valve Leakage ◽  
Safety And Reliability

Background: Valves are an important part of nuclear power plants and are the control equipment used in nuclear power plants. It can change the cross-section of the passage and the flow direction of the medium and has the functions of diversion, cutoff, overflow, and the like. Due to the earthquake, the valve leaks, which will cause a major nuclear accident, endangering people's lives and safety. Objective: The purpose of this study is to synthesize the existing valve devices, summarize and analyze the advantages and disadvantages of various devices from many literatures and patents, and solve some problems of existing valves. Methods: This article summarizes various patents of nuclear-grade valve devices and recent research progress. From the valve structure device, transmission device, a detection device, and finally to the valve test, the advantages and disadvantages of the valve are comprehensively analyzed. Results: By summarizing the characteristics of a large number of valve devices, and analyzing some problems existing in the valves, the outlook for the research and design of nuclear power valves was made, and the planning of the national nuclear power strategic goals and energy security were planned. Conclusion: Valve damage can cause serious safety accidents. The most common is valve leakage. Therefore, the safety and reliability of valves must be taken seriously. By improving the transmission of the valve, the problems of complicated valve structure and high cost are solved.

Actual Problems of the Safety and Reliability of the NPP Structures in Slovakia

2017 ◽  
Vol 738 ◽  
pp. 261-272 ◽  
Author(s):  
Juraj Kralik
Keyword(s):  
Risk Assessment ◽  
Numerical Methods ◽  
Probabilistic Analysis ◽  
Material Model ◽  
Safety Level ◽  
Concrete Cracking ◽  
The World ◽  
Safety And Reliability ◽  
Long Time ◽  
Calculated Model

The last accidents of the NPP in Chernobyl and Fukushima give us the new inspiration to verify the safety level of the NPP structures. This paper presents the new requirements to test of the safety and reliability of the NPP structures due to the last accidents in the world. The risk assessment to verify of the safety and reliability of the NPP structures based on probabilistic and nonlinear analysis is presented. The uncertainties of the loads level (long-time temperature and dead loads), the material model (concrete cracking and crushing, behaviour of the reinforcement and liner), degradation effects and other influences following from the inaccuracy of the calculated model and numerical methods were taken into account in the LHS method. The results of the deterministic and probabilistic analysis of the NPP structures are presented.

scholarly journals State-of-the-art and annual progress of bridge engineering in 2020

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Renda Zhao ◽  
Kaifeng Zheng ◽  
Xing Wei ◽  
Hongyu Jia ◽  
Haili Liao ◽  
...  
Keyword(s):  
High Performance ◽  
Concrete Bridges ◽  
Bridge Engineering ◽  
Research Progress ◽  
Concrete Bridge ◽  
Steel Bridge ◽  
Bridge Structure ◽  
Coupling Vibration ◽  
Main Research ◽  
Bridge Assessment

AbstractBridge construction is one of the cores of traffic infrastructure construction. To better develop relevant bridge science, this paper introduces the main research progress in China and abroad in 2020 from 16 aspects. The content consists of four major categories in 16 aspects. The first part is about the bridge structure, including concrete bridge and high-performance materials, steel bridges, composite girders. The second part is about the bridge disaster prevention and mitigation, including bridge seismic resistance, wind resistance of bridge, train-bridge coupling vibration research, bridge hydrodynamics, the durability of the concrete bridges, fatigue of steel bridge, temperature field and temperature effect of bridge; The third part is about the bridge analyses, including numerical simulation of bridge structure, box girder and cable-stayed bridge analysis theories. The last part is concerning the bridge emerging technologies, including bridge informatization and intelligent bridge, the technology in bridge structure test, bridge assessment and reinforcement, prefabricated concrete bridge structure.

Dynamic Experimental Analysis of a Steel Bridge

2014 ◽  
Vol 1020 ◽  
pp. 215-220 ◽  
Author(s):  
Roman Fojtík ◽  
Tomáš Novotný ◽  
Iveta Skotnicova ◽  
Martin Stolárik ◽  
Naďa Zdražilová ◽  
...  
Keyword(s):  
Experimental Analysis ◽  
Dynamic Properties ◽  
Traffic Noise ◽  
Practical Experience ◽  
Terrorist Attacks ◽  
Steel Bridge ◽  
Bridge Structure ◽  
Long Time ◽  
Wind Storms ◽  
The Moment

The paper deals with both the theoretical aspects and the practical experience with temporary steel bridge dynamic analysis. Since the moment people built the first bridge it became necessary to replace it in case of natural disasters like wind storms, floods, earthquakes, tsunami or wars and terrorist attacks. As a construction of a stable bridge lasts for a long time, the solution is a temporary bridge - a steel bridge structure designed especially for fast and repeated assembly and disassembly. The paper presents experimental analysis of steel bridge dynamic properties. The experimentally measured results are compared to theoretically calculated ones. Besides frequency analysis of supporting structure, the noise of the bridge during car passes is also measured and analyzed as nowadays traffic noise becomes a more and more important aspect, especially in case of temporary bridges. The bridge measurements are repeated for a clear bridge and for a bridge with anti-vibration mats attached to compare the arrangement results in decrease of traffic noise and the dynamic load of the bridge.

Application of Nondestructive Testing in Bridge Structure Quality Detection

2011 ◽  
Vol 66-68 ◽  
pp. 1122-1125
Author(s):  
Jing Xi Chen ◽  
Li Yuan ◽  
Guang Zhang
Keyword(s):  
Nondestructive Testing ◽  
Electromagnetic Induction ◽  
Bridge Structure ◽  
Induction Method ◽  
Actual Measurement ◽  
Structure Quality ◽  
Advantages And Disadvantages ◽  
Quality Detection ◽  
Testing Technology

This paper discusses recent nondestructive testing technology in the application of bridge structure, which focus on common rebound method and electromagnetic induction method. According to the actual measurement problems, the article explains the rebound method and electromagnetic induction method including their advantages and disadvantages, and puts forward the method of avoiding problems.

Application of Grey System Theory in the Dynamic Monitoring of Bridge

2014 ◽  
Vol 501-504 ◽  
pp. 829-833
Author(s):  
Cheng Xin Yu ◽  
Zheng Wen Yu ◽  
Yong Qian Zhao ◽  
Jia Dong Zhang
Keyword(s):  
Dynamic Deformation ◽  
Active Role ◽  
Theory Model ◽  
Grey System Theory ◽  
Dynamic Monitoring ◽  
Grey Theory ◽  
Observation Error ◽  
Bridge Structure ◽  
Grey System ◽  
Safety And Reliability

It has great significance to ensure the safety of bridge structure by using information technology to monitor the bridge dynamic deformation and find out problems in time, besides, it is more effective to make analysis of the bridge by using grey theory model. The combination of the two methods could avoid the observation error, and play an active role in improving the safety and reliability of bridge.

Finite Element Analysis on Mechanical Behavior of Orthotropic Steel Bridge Deck in Balinghe Bridge

2013 ◽  
Vol 639-640 ◽  
pp. 239-242
Author(s):  
Jian Hua Cheng ◽  
Jian Min Xiong ◽  
Jin Zhi Zhou
Keyword(s):  
Mechanical Behavior ◽  
Bridge Deck ◽  
Fatigue Cracks ◽  
Steel Bridge ◽  
Bridge Structure ◽  
Future Health ◽  
Wheel Load ◽  
Element Analysis ◽  
Box Girder ◽  
Orthotropic Steel Bridge Deck

Orthotropic plate participates in bridge structure as a part of steel box girder, while in Balinghe Bridge it is used as bridge deck directly to endure the wheel load [1]. In this paper it’s studied systematically the mechanical behavior of orthotropic steel bridge deck in combination with the deck model of Balinghe Bridge, and shows the positions emerging fatigue cracks to provide the basis for future health monitoring and put forward some suggestions.

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