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利用弹塑性理论对卷管施加弯矩载荷时的截面屈服过程进行了理论分析,得出了卷管上卷时卷管所能承受的极限弯矩;通过实例分析得出X65钢在发生塑性应变为2.5%时的卷管两端截面夹角为1.98rad、滚筒直径为5.05m、极限弯矩为99.2kN m。根据DNV-OS-F101和API-RP-1111的相关规定,可将99.2kN m界定为对卷管施加弯矩的上限值;卷管弯矩上限值对应卷管上卷时的滚筒直径上限值,表明卷管上卷时可通过滚筒直径来限制卷管弯矩值。本文结果可为深水管线卷轴铺设的应用提供理论依据。
Using the theory of elasto-plasticity, the yield stress of the cross-section during the application of bending moment is analyzed theoretically, and the ultimate bending moment of the tube can be obtained when it is wound up. Through the example analysis, the plastic strain When 2.5%, the included angle between the two ends of the bobbin is 1.98 rad, the diameter of the roller is 5.05 m, and the ultimate bending moment is 99.2 kN m. According to the relevant provisions of DNV-OS-F101 and API-RP-1111, 99.2kNm can be defined as the upper limit of the applied bending moment to the tube; the upper limit of the tube bending moment corresponds to the tube diameter The upper limit indicates that the roll tube bending moment value can be limited by the roll diameter when it is rolled up. The results of this paper can provide a theoretical basis for the application of deep water pipeline reel laying.