scholarly journals RESEARCH OF EARTHQUAKE RESISTANCE EVALUATION METHOD FOR SUPPLY NETWORKS

2006 ◽  
Vol 6 (3) ◽  
pp. 12-26
Author(s):  
Kenichi KOGANEMARU ◽  
Nobuhisa SUZUKI ◽  
Takeshi Mori ◽  
Yoshihisa SHIMIZU
Keyword(s):  
Evaluation Method ◽  
Earthquake Resistance ◽  
Supply Networks ◽  
Resistance Evaluation

Development of Ultimate Strength Evaluation Method for Piping Subjected to Seismic Loads

2013 ◽  
Author(s):  
Hideo Machida ◽  
Hiromasa Chitose ◽  
Tatsuhiro Yamazaki
Keyword(s):  
Power Plants ◽  
Evaluation Method ◽  
Failure Modes ◽  
Limit State ◽  
Seismic Loading ◽  
Earthquake Resistance ◽  
State Function ◽  
Limit State Function ◽  
Input Acceleration ◽  
Resistance Tests

This paper reports the results of the study on the failure modes and limit loads of piping in nuclear power plants subjected to cyclic seismic loading. By investigating the past fracture tests and earthquake resistance tests, it became clear that dominant failure mode of piping was fatigue, and the effect of ratchet strain was negligible. Until now, the stress generated with the acceleration of an earthquake was classified into the primary stress. However, the relationship between the input acceleration and the seismic response displacement of the pipe observed from earthquake resistance tests is non-linear, and increasing rate of displacement is lower than that of input acceleration in elastic-plastic stress condition. Therefore, the seismic loading can be treated as displacement controlled loading. To evaluate the reliability-based critical acceleration, a limit state function was defined taking the variations in the fatigue strength or some parameters into consideration. By using the limit state function, the reliability was evaluated for the typical piping of boiling water reactor (BWR) plants subjected to cyclic seismic loading, and a partial safety factors were calculated. Based on these results, a fatigue curve corresponding to the target reliability was proposed.

scholarly journals A novel wheat lodging resistance evaluation method and device based on the thrust force of the stalks

PLoS ONE ◽  
2019 ◽  
Vol 14 (11) ◽  
pp. e0224732
Author(s):  
Suwei Feng ◽  
Dechuan Kong ◽  
Weihua Ding ◽  
Zhengang Ru ◽  
Gan Li ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Thrust Force ◽  
Lodging Resistance ◽  
Resistance Evaluation

scholarly journals Joint- or Crack-Opening Resistance Evaluation of Waterproofing Material and System for Structural Sustainability in Railroad Bridge Deck

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4229
Author(s):  
Kyu-Hwan Oh ◽  
Soo-Yeon Kim ◽  
Yong-Gul Park
Keyword(s):  
High Speed ◽  
Evaluation Method ◽  
Bridge Deck ◽  
Crack Opening ◽  
Evaluation Criteria ◽  
Membrane System ◽  
Joint Opening ◽  
Resistance Evaluation ◽  
Railroad Bridge ◽  
Selection Of

A joint- or crack-opening resistance evaluation method for the selection of optimal waterproofing material for a railroad bridge deck is proposed. The joint opening range (mm) for the evaluation, and a typical load case of a high-speed double-track railroad bridge structure deck, is analyzed through the finite element method (FEM) and the results of analysis are used to calculate the minimum opening range. The evaluation method is then demonstrated with 4 commonly used waterproofing types of cementitious membrane system: a polyurethane coating system, self-adhesive asphalt sheet system and synthetic polymerized rubber gel composite asphalt sheet system. Five specimens of each type are subjected to continuous joint opening under 4 different joint width range conditions (1.5, 3.0, 4.5, and 6.0 mm), and the joint-opening resistance performance is compared. The proposal for the evaluation criteria and the specimen test results demonstrate how the evaluation method is pertinent for future selection of waterproofing membranes for the sustainability of high-speed railroad bridge deck structures.

ICONE11-36593 DEVELOPMENT OF FATIGUE RESISTANCE EVALUATION METHOD FOR SOCKET-WELD-JOINTED PIPES

2003 ◽  
Vol 2003 (0) ◽  
pp. 84
Author(s):  
Shinji Noguchi ◽  
Motoaki Shibayama ◽  
Masazumi Iwata ◽  
Masayuki Matsuura
Keyword(s):  
Fatigue Resistance ◽  
Evaluation Method ◽  
Resistance Evaluation

Seismic Test Result of Motor-Operated Butterfly Valve Actuators for Nuclear Power Plant

2018 ◽  
Author(s):  
Nobuo Kojima ◽  
Yoshitaka Tsutsumi ◽  
Kazuyoshi Yonekura ◽  
Koji Nishino ◽  
Yukio Watanabe ◽  
...  
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Earthquake Resistance ◽  
Test Results ◽  
Butterfly Valve ◽  
Resistance Evaluation ◽  
Vibration Tests ◽  
Seismic Tests ◽  
Test Result

Seismic tests were carried out to confirm the operability limit acceleration for a standard motor-operated butterfly valve actuator in three excitation directions. Based on the results, seismic brackets that can operate valves even in three directions at 20 × 9.8 m/s2 or more were designed in three representative models. For the model subjected to the seismic test, we mounted the designed seismic bracket and confirmed the operability of the butterfly valve actuator by carrying out vibration tests in three directions at 20 × 9.8 m/s2. We used these results and previously reported motor-operated valve actuator seismic test results to creat a revision (draft) of the earthquake resistance evaluation methods.

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