Safety Assessment of Metal Structure with Surface Plane Defects under Random Loads
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摘要: 许多含有表面平面缺陷的金属结构都受到随机载荷的作用。以结构可靠度为基础探讨了随机载荷对结构安全评定的影响。通过统计结构所承受的载荷,得到随机载荷的统计参数(平均载荷、载荷标准差),并使用载荷的统计参数对实际载荷进行等效处理。通过蒙特卡罗方法计算结构的可靠度,研究一定可靠度下随机载荷的变异系数和分散性安全系数的关系。结果发现,不考虑载荷分散性的影响是偏于危险的。载荷分散性的影响可以分散性系数来衡量,使用分散性安全系数对载荷进行等效处理,最后采用处理后的等效载荷进行结构的安全评定。Abstract: Many metal structures with surface plane defects are always subject to random loads.In this paper,a simple safety assessment method for these structures is introduced.In this method,the distribution law of the random loads is simulated by the statistic parameter of the loads,and a certain method is used to deal with the real random loads.Monte-Carlo method is used to calculate the reliability of the structure.The relationship between the safety factor of the structure and the coefficient of variation（COV）of the random loads is studied.The results show that it is dangerous ignoring the random of the loads and the influence of the random of the loads can be measured by a safety factor.By using this safety factor,an equivalent invariableness load will be gained to be used in the safety assessment.
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Key words:
- Random load /
- Surface plane defect /
- Safety assessment
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