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采用“混合原则”（ｌａｗｏｆｍｉｘｔｕｒｅ）分析复合钢管中内层防腐材料对复合钢管强度的影响，提出新的复合钢管强度设计准则，并采用蒙特卡罗方法证明了其在管线强度设计中应用的可靠性．
The “principle of mixing” (lawofmixture) was used to analyze the influence of inner anticorrosive materials on the strength of composite steel pipe. A new strength criterion for composite steel pipe was put forward and the reliability of its application in pipeline strength design was proved by Monte Carlo method .