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Research on the Strength members of Ship Structure under the Quasi-Static Loads and the Dynamic Loads

准静载荷和动载荷作用下船舶结构强度构件的研究

基本信息

批准号：
60302052
负责人：
FUNAKI Toshihiko
金额：
$ 6.91万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

项目摘要

In order to prevent some serious damages of the strength members of ship structure, research on the buckling strength, on the plastic collapse of transverse structure of ship, on the fatigue strength under random loading and on the impact strength were carried out. 1) A new elastic buckling interaction equation for simply supported rectangular plates was proposed when the plates was subjected to five loads components, such as compression and bendings in two directions and shear. A comparison was made with interactions proposed by Lloyd's Register and Det Norske Veritas. The results indicated that the new interaction proposal in this research yielded better accuracy in safety side. 2) Reliability assessment of the plastic collapse of ship transverse structure was evaluated under quasi-static extreme loads to generate the safety margin, using a matrix method and was successlly applied to the large and medium size tankers and ore carriers under some national loading conditions. 3) The capabilities of an ideal structural units method were extended so that they can be accurately applied to a wider range of actual structures. Lateral load was also considered and its interaction with initial imperfections was taken into account. 4) A new fatigue test method was proposed, which was able to obtain S-N diagram under random loading during a very short period of time. A comparison was made with strength diagram calculated using DOE guidance and AWS code for butt and fillet weld mild steel. 5) To estimate the impact pressure acting on the panels of ship in the waves, some parametric experiments were carried out to investigate the effects of the rigidity of the panel on the impact pressure. And a new method to estimate the dynamic response of the panel under impact pressure was developed.

为了防止船舶结构强度构件的严重破坏，对船舶结构的屈曲强度、横向结构的塑性破坏、随机载荷下的疲劳强度和冲击强度进行了研究。1)提出了一种新的四边简支矩形板在两个方向的压缩、弯曲和剪切等五个载荷分量作用下的弹性屈曲相关方程。与劳埃德船级社和挪威船级社提出的相互作用进行了比较。结果表明，新的交互建议在本研究中产生了更好的安全方面的准确性。2)采用矩阵法对船舶横向结构在准静态极限载荷作用下的塑性倒塌可靠性进行了评估，以产生安全裕度，并成功地应用于国内某些载荷条件下的大中型油船和矿砂船。3)扩展了理想结构单元法的计算能力，使其能够准确地应用于更广泛的实际结构。同时考虑了侧向荷载及其与初始缺陷的相互作用。4)提出了一种新的疲劳试验方法，该方法能够在很短的时间内获得随机载荷下的S-N图。并与美国能源部（DOE）和美国焊接学会（AWS）规范计算的低碳钢对接和角焊缝强度图进行了比较。5)为估算波浪中船体壁板的冲击压力，进行了壁板刚度对冲击压力影响的参数试验。提出了一种新的计算板在冲击载荷作用下动态响应的方法。