Study on Load Carrying Capacity of Offshore Structure with Damaged Member

含损伤构件的海上结构承载能力研究

基本信息

批准号：
01460165
负责人：
YAO Tetsuya
金额：
$ 3.71万
依托单位：
Hiroshima university
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01460165/
关键词：
Tubular Bracing Member Buckling Plastic Collapse Denting Damage Offshore Structure Idealized Structural Unit Method finite Element Method Collapse Test Elastoplastic Large Deflection Analysis 局部座屈円筒部材理想化構造要素曲げ損傷凹損

项目摘要

In this study, the influences of denting damage on strength and rigidity of tubular bracing members in offshore structures have been investigated both experimentally and theoretically. it has been found that :1. A dented part is accompanied by residual stresses, and the bottom of a dent is almost yielded.2. Both geometry of a dent and the residual strains and stresses affect the strength -and rigidity of a tubular bracing member.3. When a dent is objected to compressive force, the ultimate strength is reduced by a dent. After the ultimate strength has been attained, the dent becomes to crow and local shell buclilinc, l takes place near the end of a dent bottom.4. When a dent is subjected to tensile force, the rigidity decreases due to a dent. However, a dent is recovered with the increase of load, and the fully plastic strength is not so much affected by a dent.5. Under a cyclic loading, a crack easily initiates at the end of the dent bottom.The idealized structural unit for a dented tubular member under axial tension is developed improvinal the unit for a dented tubular member under axial compression. It has been found that further improvements are necessary as indicated below.1. Growth of a dent under compressive force and recovery of a dent under tensile force should be considered.2. The influence of a dent on rigidity should be considered especially when a dent is under tensile force.3. The influence of residual stresses at a dented part should be considered.

在这项研究中，在实验和理论上研究了齿状损伤对近海结构中的强度和刚性的影响。已经发现：1。凹痕部分伴随着残余应力，凹痕的底部几乎产生。2。凹痕的几何形状以及残留菌株和应力都会影响管状支撑构件的强度和刚度3。当凹痕反对压缩力时，凹痕会降低最终强度。达到最终的强度后，凹痕变成乌鸦和当地的壳，l发生在底部底部的末端附近。4。当凹痕受到拉伸力时，由于凹痕，刚性会降低。但是，随着负载的增加而回收了凹痕，并且完全塑性强度不受凹痕的影响。5。在循环载荷下，裂纹很容易在凹痕的末端启动。轴向张力下的凹痕管构件的理想结构单元被置于轴向压缩下的凹痕管构件的单位。已经发现，如下所示，有必要进一步改进。1。应考虑在压缩力下的凹痕生长，并在拉伸力下恢复凹痕。2。应考虑凹痕对刚性的影响，尤其是当凹痕处于拉伸力之下时。3。应考虑残留应力在凹痕部分的影响。