Ultimate Hull Girder Strength under Longitudinal Bending

纵向弯曲下的极限船体梁强度

• 批准号: 12555276
• 负责人: YAO Tetsuya
• 金额: $ 7.55万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555276/
• 关键词: Ultimate Longitudinal Strength; Buckling Strength; Ultimate Strength; Progressive Collapse Analysis; Idealized Structural Unit Method; Smith's Methods; Continuous Stiffened Plate; Strength Assessment; 座屈・塑性崩壊挙動; 断面の反りの影響; 解析的手法; 船体ビルジ部; 座屈・塑性崩

1. The best modelling method of stiffener in the stiffened plating under thrust was investigated. It was found that the stiffener web should be modelled by a plate whereas stiffener flange should be modelled by a beam-column to obtain accurate results efficiently when the collapse behaviour of cotinuous stiffened plating is analysed either by the analytical method or the FEM.2. To investigate the collapse behaviour and strength of bottom structure, a simple but effective method was developed which enables to simulate the collapse behaviour of stiffened plating subjected to combined lateral pressure and thrust loads. The rationality of this method was confirmed by comparing the calculated results by this method with those by the FEM analysis. This method was implemented into the computer code to simulate progressive collpse behaviour of a ship hull girder subjected to longitudinal bending. It was confirmed that the influence of lateral pressure on ship bottom and side shell plating on t … More he ultimate hull girder strength is rather small.3. Performing a series of elastoplastic large deflection analysis by the FEM, progressive collapse behaviour of a bilge circle was simulated and investigated. On the basis of the calculated results, a simple dynamical model was developed to simulate collapse behaviour of bilge circle. This model was implemented into the computer code to simulate progressive collapse behaviour of a ship hull girder subjected to longitudinal bending. It was confirmed that the ultimate hull girder strength is almost the same but the capacity beyond the ultimate hull girder strength is a little different when the buckling effect of a bolge circle is accounted.4. New method was developed to account for the influence of warping of the cross-section produced by shear force on the progressive collapse behaviour and the ultimate hull girder strength. It was found that the ultimate hull girder strength is reduced by 15% at maximum when the normal stress by warping becomes compressive at the compression side of the hull girder bending.5. The plate ISUM (Idealised Structural Unit Method) element was newly developed which enables to perform collapse analysis of a ship hull girder subjected to longitudinal bending. In this research project, collapse analysis was not yet performed. However, this new element was combined with beam-column elements and the collapse behaviour of a stiffened plate in compression was accurately simulated. The application of this elements to hull girder collapse analysis remains as a future task.6. Sensitivities of various design factors on the ultimate hull girder strength were evaluated. Using these sensitivities, reliability analysis was performed on four existing vessels. It was concluded that these vessels are safe enough against breaking of their hull girder.7. It can be recommended that different method should be applied according to the stage of design to evaluate the ultimate hull girder strength. For the detailed analysis, the Smith's method using accuately derived average stress-average strain relationships of stiffened plate element was recommended as the best method to evaluate ultimate hull girder strength of a ship hull girder. Less

1。研究了推力下加强板中加强型的最佳建模方法。发现加强板应通过板模型，而加劲孔法兰应通过梁柱进行建模，以在通过分析方法或fem.2分析连续加强板的倒塌行为时有效地获得准确的结果。为了研究底部结构的崩溃行为和强度，开发了一种简单但有效的方法，该方法能够模拟受到侧向压力和推力载荷结合的僵硬板的塌陷行为。通过将该方法与FEM分析的方法进行比较，通过比较该方法计算的结果来确认该方法的合理性。该方法已在计算机代码中实现，以模拟船体船体的渐进式COLPSE行为，受到了纵向弯曲。有人证实，侧向压力对船底和侧壳镀层的影响……更多，他最终的船体盖特强度很小。3。模拟并研究了通过FEM进行一系列弹性塑性大挠度分析，进行了舱底圆圈的进行性崩溃行为。根据计算结果，开发了一个简单的动态模型来模拟舱底圆的塌陷行为。该模型被实施到计算机代码中，以模拟船体船体的渐进式崩溃行为，遭受纵向弯曲。据证实，最终的船体距离的强度几乎是相同的，但是当考虑到一个圆圈的屈曲效果时，超出最终船体盖特强度的能力有所不同。4。开发了新的方法来说明剪切力对横断面的影响对进行性崩溃行为和最终的船体距离强度的影响。发现当正常应力在船体的伸缩弯曲的压缩侧变得压缩时，最终的船体距离强度最大减少了15％。5。新开发的板ISUM（理想化的结构单位方法）元素是新开发的，该元件能够对经受纵向弯曲的船体船体的船体进行塌陷分析。在该研究项目中，尚未进行崩溃分析。但是，该新元素与光束列元素结合在一起，并准确模拟了压缩板的倒塌行为。该元素在船体色带塌陷分析中的应用仍然是将来的任务。6。评估了各种设计因素对最终船体色带强度的敏感性。使用这些灵敏度，对四个现有血管进行了可靠性分析。得出的结论是，这些容器足够安全，可以打破其船体丝带。7。可以建议根据设计阶段应用不同的方法，以评估最终的赫尔盖特强度。为了进行详细的分析，建议使用僵硬的板元件的平均压力平均应变关系作为评估船体船体船体船体的最终船体的强度的最佳方法。较少的

项目成果

Rigo, P., Toderan, C., Yao, T.: "Sensitivity Analysis on Ultimate Hull Bending Moment"Proc. 8^<th> Conf. on Practical Design of Ship and Offshore Floating Structures. II. 987-995 (2001)

Rigo, P.、Toderan, C.、Yao, T.：“船体极限弯矩的敏感性分析”Proc。

Ikeda, A., Yao, T., Kitamura, O., Yamamoto, N., Yoneda, M. and Ohtsubo, H.: "Assessment of Ultimate Longitudinal Strength of Aged Tankers"Proceeding of the 8th International Symposium on Practical Design of Ships and Other Floating Structures, Shanghai, C

Ikeda, A.、Yao, T.、Kitamura, O.、Yamamoto, N.、Yoneda, M. 和 Ohtsubo, H.：“老化油轮极限纵向强度评估”第八届国际油轮实用设计研讨会论文集

Mukherjee, S., Yao, T.: "Buckling/Plastic Collapse Behaviour and Strength of Continuous Stiffened Plate with Inclined Stiffeners"Proc. The 12th Int. Offshore and Polar Engineering Conf. At Kita-Kyushu, Japan. Vol.IV. 464-471 (2002)

Mukherjee, S., Yao, T.：“带有倾斜加强筋的连续加筋板的屈曲/塑性破坏行为和强度”Proc。

Yao.T.et al.: "Ultimate Hull Girder Strength"Proc. 14^<th> International Ship and Offshore Structures Congress (ISSC). II. 321-291 (2000)

Yao.T.et al.：“终极船体梁强度”Proc。

矢尾哲也, 林 茂弘, 村上睦尚, 桑原隆彦: "面内圧縮荷重を受ける有孔矩形板の座屈・最終強度に関する研究(第2報)"日本造船学会論文集. 191. 265-271 (2002)

Tetsuya Yao、Shigehiro Hayashi、Mutsuhisa Murakami、Takahiko Kuwabara：“平面内压缩载荷下穿孔矩形板的屈曲和极限强度研究（第二次报告）”日本造船学会汇刊 191. 265-271。 (2002))