Applicability of Seismic Fatigue Evaluation by JSME Code Case, NC-CC-008

2019 ◽  
Author(s):  
Akihito Otani ◽  
Izumi Nakamura ◽  
Tomoyoshi Watakabe ◽  
Masaki Morishita ◽  
Tadahiro Shibutani ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Evaluation Methodology ◽  
Response Analysis ◽  
Analysis Method ◽  
Seismic Evaluation ◽  
Fatigue Evaluation ◽  
Conservative Result ◽  
Current Rule

Abstract A Code Case, JSME S NC1, NC-CC-008, in the framework of JSME Nuclear Codes and Standards has been published. New seismic evaluation methodology for piping by utilizing advanced elastic-plastic response analysis method and strain-based fatigue criteria has been incorporated into the code case. It can achieve more rational seismic design than the current rule. This paper demonstrates validity and applicability of fatigue evaluation method proposed in the code case. Experimental results of a shaking table test for a piping model is used for comparing the evaluation by the current rule with one by the code case. As a result, it is confirmed that the code case can provide a rational and conservative result in the fatigue evaluation of piping. Moreover, cycle counting in the fatigue evaluation was examined for further progress of the code case.

Benchmark of Elastic Plastic Seismic Response Analysis and Fatigue Evaluation for Piping

2015 ◽  
Author(s):  
Teruyoshi Otoyo ◽  
Akihito Otani
Keyword(s):  
Seismic Response ◽  
Shaking Table Test ◽  
Time History ◽  
Experimental Results ◽  
Shaking Table ◽  
Response Analysis ◽  
Seismic Evaluation ◽  
Seismic Response Analysis ◽  
Elastic Plastic ◽  
Fatigue Evaluation

This paper shows a benchmark result regarding elastic-plastic seismic response analysis and fatigue evaluation for of piping model excitation test. National Research Institute for Earth Science and Disaster Prevention (NIED) has a lot of experimental results of shaking table test of piping. To propose advance seismic evaluation method for piping under severe seismic event, a task in JSME Code committee performs benchmark activity for elastic plastic seismic response analysis and evaluation for piping by using NIED’s experimental results [1]. Authors are taking part in the task and have been performed a benchmark of seismic response analysis and seismic evaluation by comparing with the experimental results. For fatigue evaluation, the strain ranges and the cycles of each range obtained from strain time history were evaluated. The response acceleration and displacement was evaluated for plastic collapse.

Acceleration Data Acquisition and Analysis Method of Shaking Table Test

2015 ◽  
Vol 724 ◽  
pp. 205-212 ◽  
Author(s):  
Shao Feng Chai ◽  
Ping Wang ◽  
Zhi Jian Wu ◽  
Jun Wang ◽  
Gao Feng Che
Keyword(s):  
Data Processing ◽  
Test Data ◽  
Shaking Table Test ◽  
Damping Ratio ◽  
Shaking Table ◽  
Amplification Coefficient ◽  
Response Analysis ◽  
Analysis Method ◽  
Stability And Instability ◽  
Sine Sweep

Shaking table test is an important means of simulated earthquake in laboratory, slope shaking table test data provide a scientific basis for analysis of dynamic stability and instability mechanism of slopes. Sine vibration table test data processing is different from general frequency domain analysis method, need real-time data processing in time domain. Taking the sine sweep test conditions, which is one of the conditions in "Earthquake landslide and slope prevention and control technology research on shaking table test", as an example. Describes the layout of sensors in shaking table test and the reasons; Sine sweep test load and aim; and listed the steps and methods of the sine sweep test in data processing; Through the processing and analysis of test data identified the vibration frequency of model and shaking table system is 30Hz, damping ratio is 2.06%; Analysis and calculation of the different sections of the slope and position of the amplification coefficient. A methodological guidance for shaking table test and dynamic response analysis of the slope is provided.

The Fracture Limit of Steel-Frame Members Under Dynamic Repeated Loads Through the Shaking Table Test

2018 ◽  
Author(s):  
Kensuke Shiomi ◽  
Yusuke Wada
Keyword(s):  
Plastic Deformation ◽  
Dynamic Load ◽  
Evaluation Method ◽  
Shaking Table Test ◽  
Seismic Analysis ◽  
Steel Frame ◽  
Shaking Table ◽  
Test Results ◽  
Structural Members ◽  
Worst Case

Recently, much larger earthquakes are considered in the seismic designs of steel-frame structures in Japan. Under these severe ground motions, it is expected that not only the elasto-plastic deformation but also the fracture of the structural members could occur during the earthquakes. And through these situations, the more advanced seismic design or evaluation method which allow the partial destruction inside the structure and prevent from the worst-case scenario like the whole collapse are coming to be demanded. One of the ways to achieve this demand is considering the effects of not only the elasto-plastic deformation but also the fracture of structural members in the seismic analysis. In order for that, it is important to clarify the fracture limit of steel-frame members precisely under the dynamic load. Many static tests to clarify the members’ ultimate behavior were conducted in the past, but the dynamic tests were not well enough. In this research, the vibration tests were conducted to clarify the fracture limit of steel-frame members under the dynamic load. The behavior of the steel-frame members until the fracture was obtained by applying the repeated dynamic bending deformation with the shaking table. Also, The FEM analysis for the shaking table test results was conducted. Through the tests and the analysis study which simulates the test results, the mechanism of the member fracture occurred in the test under the dynamic loads were examined.

A Full-Scale Shaking Table Test on Philippine Concrete Hollow Blocks (CHB) Masonry Houses

2015 ◽  
Vol 10 (1) ◽  
pp. 113-120 ◽  
Author(s):  
Hiroshi Imai ◽  
◽  
Chikahiro Minowa ◽  
Angelito G. Lanuza ◽  
Henremagne C. Penarubia ◽  
...  
Keyword(s):  
Developing Countries ◽  
Shaking Table Test ◽  
Evaluation Methods ◽  
The Philippines ◽  
Full Scale ◽  
Shaking Table ◽  
Masonry Structures ◽  
Seismic Evaluation ◽  
Hollow Block ◽  
Traditional Manner

Most of the human casualties in past earthquakes were attributed to the collapse of buildings, particularly masonry constructions in developing countries. Most of these buildings are categorized into “Non-Engineered Construction.” In effect, these structure are spontaneously and informally constructed in various countries in a traditional manner without any or with little intervention in their design by qualified architects and engineers. Unfortunately, these types of buildings have been extensively constructed in most of the seismic prone areas in developing countries. Therefore, the safety of “Non-Engineered Construction” has become one of the most urgent issues in recent years. The concrete hollow block (CHB) masonry structures have recently become common residential structures in the Philippines. A full-scale shaking table test on CHBmasonry structures of Philippine ordinary houses was conducted in Japan. This experiment aims to acquiring a better understanding of the behavior of these structures during major earthquakes, and its results will be used to produce simple seismic evaluation methods as awareness tools, and to disseminate information on safer construction of houses in the Philippines.

scholarly journals Comprehensive Assessment of Distance Learning Modules by Fuzzy AHP-TOPSIS Method

Mathematics ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 409
Author(s):  
Svajone Bekesiene ◽  
Aidas Vasilis Vasiliauskas ◽  
Šárka Hošková-Mayerová ◽  
Virgilija Vasilienė-Vasiliauskienė
Keyword(s):  
Decision Making ◽  
Distance Learning ◽  
Quality Assessment ◽  
Evaluation Method ◽  
Fuzzy Ahp ◽  
Fuzzy Topsis ◽  
Evaluation Methodology ◽  
Practical Implementation ◽  
Ideal Solution ◽  
Analysis Method

This survey is focussed on distance learning studies, where there can be met a lot of technical obstacles, which creates complications in decision making. To get an ideal solution for these kinds of problems, the Fuzzy TOPSIS (Technique for Order Preference by Similarities to Ideal Solution) is one of the best solutions. Therefore, this paper presents the distance learning quality assessment surveys when the Fuzzy AHP (Analytic Hierarchy Process) and TOPSIS methods are used. Research results describe the application of the Fuzzy AHP—TOPSIS hybrid method. MCDM (Multi-Criteria Decision Making) programs with MATLAB (R2020b) mathematical package were written to calculate the evaluation results for three distance learning courses. In the practical implementation of the proposed distance learning module evaluation methodology, the experts’ evaluation method was applied. Thirty-four judges were chosen with specific knowledge and skills and with very different competencies to assess three alternatives by fourteen criteria. Following the experts’ evaluation, a statistical analysis method was used to process the data. After applying the complex evaluation, the comparative analysis method was used to summarize the obtained results. This work further provides useful guidelines for the development of an easily understandable hierarchy of criteria model that reflects the main goal of study quality assessment.

Optimization of Environmental Fatigue Evaluation: Step 1

2007 ◽  
Author(s):  
Takao Nakamura ◽  
Masanobu Iwasaki ◽  
Seiji Asada
Keyword(s):  
Evaluation Method ◽  
Fatigue Curve ◽  
Design Stage ◽  
Total System ◽  
Analysis Method ◽  
Safety Factors ◽  
Alternative Evaluation ◽  
Plant Construction ◽  
Fatigue Evaluation ◽  
Design And Construction

In order to introduce environmental effects into fatigue evaluation of design and construction codes, the environmental fatigue evaluation method should not only be established, but the conservativeness of the codes, such as safety factors of design fatigue curve and simplified elastic-plastic analysis method (Ke factor), etc. should also be reviewed. Then plant designers should optimize total system of fatigue evaluation according to the objective of the codes by properly selecting design transient conditions and stress analysis methods used in fatigue evaluations as necessary. In addition, investigation of measures for reducing fatigue should be performed to mitigate possible fatigue initiators and alternative evaluation methods in case that the evaluation result should exceed the criteria specified in the design and construction codes. This paper discusses the present status in the review of these items for the Japanese PWR plants and future prospects to tackle on the application of environmental fatigue evaluation in design stage of plant construction.

Seismic Evaluation Method of Piping Systems by Inelastic Response Spectrum Analysis: Part 1 — Response Analysis

2019 ◽  
Author(s):  
Ichiro Tamura ◽  
Michiya Sakai ◽  
Shinichi Matsuura ◽  
Ryuya Shimazu ◽  
Hiroaki Tamashiro ◽  
...  
Keyword(s):  
Spectrum Analysis ◽  
Evaluation Method ◽  
Response Spectrum ◽  
Vibration Test ◽  
Piping System ◽  
Analysis Method ◽  
Seismic Evaluation ◽  
Response Spectrum Analysis ◽  
Inelastic Response ◽  
Piping Systems

Abstract An inelastic response-spectrum-analysis method for multi-degree-of-freedom systems was proposed. The method has lower analysis loads and good outlook given by the inelastic response spectrum like the elastic response-spectrum-analysis method, and is not an equivalent-linearization method. We propose a seismic evaluation method of piping systems to conduct seismic design using the inelastic response-spectrum-analysis. In this paper, the inelastic analysis method of piping systems for the seismic evaluation method is proposed and applied to a benchmark analysis problem of a piping system vibration test. The analysis result is compared with the vibration test result of the piping system. They are consistent and applicability of the analysis to the piping system was confirmed.

Study on Incorporation of a New Design Fatigue Curve Into the JSME Environmental Fatigue Evaluation Method

2019 ◽  
Author(s):  
Seiji Asada ◽  
Shengde Zhang ◽  
Masahiro Takanashi ◽  
Yuichirou Nomura
Keyword(s):  
Nuclear Power ◽  
Evaluation Method ◽  
Fatigue Curve ◽  
Fatigue Analysis ◽  
Analysis Method ◽  
Energy Research ◽  
Research Committee ◽  
Engineering Society ◽  
Fatigue Evaluation ◽  
Generation Facility

Abstract A new fatigue analysis method was developed in the Subcommittee on Design Fatigue Curve in the Atomic Energy Research Committee in the Japan Welding Engineering Society JWES). If the new design fatigue curves are incorporated into the Environmental Fatigue Evaluation Method of the Japan Society of Mechanical Engineers (JSME), the environmental fatigue analysis can be optimized. The Subgroup on Fatigue Evaluation of the Subcommittee on Nuclear Power in the Main Committee on Power Generation Facility Codes in the JSME is reviewing the new design fatigue curves to incorporate into the JSME Environmental Fatigue Evaluation Method. This paper discuss the new design fatigue curves which is under review.

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