桶型基础在负压作用下的屈曲分析

桶型基础是一种新型的基础结构形式 ,它采用短粗圆柱薄壳结构 ,利用负压原理安装 ,当基础非常接近海床时 ,裙端在横向没有约束 ,在静水压力作用下极易产生屈曲 ,是结构最危险的状态。本文将此时的结构简化为一端固定 ,一端自由的圆柱薄壳 ,采用经典线性屈曲理论 ,通过选取轴向梁函数与周向三角形函数的组合作为屈曲挠度函数 ,得到了桶型基础在一端固定 ,另一端自由边界条件下的线弹性屈曲的解析解。同时采用工程实例进行计算 ,并与有限元计算进行了对比 ,获得了比较满意的结果。根据本文的理论方法编制的程序简单明了 ,计算方便 ,非常适合于实际工程中的预算和评估。

Buckling Analysis of Bucket Foundation under Suction

Bucket foundation is a new type foundation in ocean engineering, which is a short cylindrical thin shell, penetrated with the suction theory. The skirt tip is not constrained in the radial direction when bucket foundation is very closed to the seabed, which may be the most dangerous situation because of buckling under hydraulic presure. In this paper the structure of bucket foundation is modeled as a cylindrical thin shell with fixed-free boundary condition. The theoretical results of linear buckling of bucket foundation are obtained by selecting the combination of beam function in axis direction and function in circular direction as buckling deflection functions. At the same time, two practical examples are calculated using the results, and compared with the FEM. The program with this method is convenient and suitable for budget and evaluation in practice.