Safety Assessment of Metal Structure with Surface Plane Defects under Random Loads

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.