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| Analysis of Residual Life of Derrick Steel Structure Based on the Time-varying Reliability and Fatigue Effects |
| HAN Dong-ying1,WANG Zhi-lei2,ZHU Jin-li3 |
1. College of Vehicles & Energy, Yanshan University, Qinhuangdao, Hebei 066004, China;
2. Great Wall Motor Company Limited, Baoding, Hebei 071000, China;
3. Bohai Equipment Liaohe Thermal Recovery Machinery, Panjin, Liaoning 124209, China |
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Abstract In order to predict the remaining service life of derrick steel structure accurately, the theory of a residual life prediction based on time-varying reliability and fatigue effects is established. The function between the rods equivalent cross-sectional area, damage and defects with time is derived. The varying model of resistance is established. Prepared the oil derrick fatigue load spectrum, and the life prediction based on fatigue effects is established based on S-N curve and rain flow theory. The residual life of JJ220/42-K type of derrick steel structure is predicted, the results show the reliability life of the structure with corrosion and rods bent is much less than the fatigue life of the structure only with corrosion, and the reliability life was much less than the fatigue life.
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2015, Vol. 36 
