Research on buckling collapse behavior and ultimate strength of stiffened plating in compression

加筋板受压失稳破坏行为及极限强度研究

基本信息

批准号：
14205144
负责人：
YAO Tetsuya
金额：
$ 14.98万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14205144/
关键词：
Continuous stiffened panel Buckling ultimate strength Curved stiffened panel Idealized Structural Unit Method Finite Element Method Tripping buckling Combined thrust pressure load Elastic Elastoplastic large defection analysis 座屈・塑性崩

项目摘要

The items and results of research issues which have been studied in the present research project are as follows.(1)Consideration on modelling of stiffeners in the collapse analysis of stiffened panel under axial thrustIt was found that most effective modeling is to model the web by plate and the flange by beam-column.(2)Influence of inclination angle of stiffeners to plating on buckling collapse behavior of stiffened platesIt was found that inclination angle does not affect the local buckling strength, whereas it affects the capacity beyond the ultimate strength as well as the overall buckling strength.(3)Application of ISUM to collapse analysis of stiffened plates subjected to combined loadingCombining new ISUM plate element and beam-column element, collapse behavior of continuous stiffened plates under combined bi-axial and pressure loading was simulated very accurately.(4)Buckling/plastic collapse behavior of curved stiffened platesIt has been found that elastic local buckling stren … More gth increases linearly with the increase in curved angle. On the other hand, the curved plates in actual ship structure undergoes plastc buckling, and the ultimate compressive strength is nearly equal to the yielding strength.(5)Influence of residual stress in stiffeners on buckling collapse behavior of stiffened platesThe sign of the residual stress in web and flange opposite in rolled and welded T-type stiffeners. However, this difference affect a little on the ultimate compressive strength of stiffened plate.(6)Consideration on influence of stiffener tripping on collapse behavior of stiffened platesIt was found that tripping takes place at the stiffener web in the compression side of bending resulting from over-all bending. The condition for the occerrence of tripping is left unknown.(7)Buckling collaose behavior and strength of alminium stiffened platesThe welding residual stress increases the buckling/ultimate strength of alminium stiffened plate when the stiffened plate is fabricated by connecting rolled stiffened plates by butt-welding. On the other hand, softening of the material in heat affected zone reduce the ultimate compressive strength of alminium stiffened plates. Less

本研究课题的研究项目和结果如下：(1)加筋板轴向推力倒塌分析中加劲肋建模的思考发现最有效的建模方法是对腹板进行建模(2)加劲肋与板的倾角对加筋板屈曲破坏行为的影响发现,倾角不影响局部屈曲强度,但会影响加筋板的局部屈曲强度。 (3)ISUM在组合荷载下加筋板倒塌分析中的应用结合新型ISUM板单元和梁柱单元，研究了组合荷载下连续加筋板的倒塌行为。轴向和压力载荷的模拟非常准确。(4)弯曲加筋板的屈曲/塑性塌陷行为发现弹性局部屈曲强度随弯曲角度的增加而线性增加。另一方面，实际船舶结构中的曲线板发生塑性屈曲，其极限抗压强度几乎等于屈服强度。(5)加劲肋残余应力对加筋板屈曲破坏行为的影响腹板残余应力和腹板残余应力的符号卷制T型加劲肋与焊接T型加劲肋的翼缘相反，但这种差异对加筋板的极限抗压强度影响不大。(6)加劲肋脱扣对加筋板倒塌性能影响的考虑。结果发现，由于整体弯曲，在受压侧的加强筋腹板上发生了跳闸，但跳闸的发生条件尚不清楚。(7)铝加劲板的屈曲塌陷行为和强度、焊接残余应力。当通过对焊连接轧制加筋板来制造加筋板时，增加了铝制加筋板的屈曲/极限强度。另一方面，材料在加热中软化。受影响区域降低铝加筋板的极限抗压强度。