Accumulated displacement and unloading stiffness variations of modified suction caisson in sand under multidirectional lateral cyclic loading
Accumulated displacement and unloading stiffness variations of modified suction caisson in sand under multidirectional lateral cyclic loading
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多向横向循环荷载作用下砂土中改良吸力沉箱的累积位移及卸载刚度变化
DOI：
10.1016/j.oceaneng.2022.112975
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发表时间：
2022-12
影响因子：
5
通讯作者：
陈珂
中科院分区：
文献类型：
--
作者：
李大勇;白云;张雨坤;陈庆剑;陈珂
改进的吸力沉箱（MSC）是海上风力涡轮机的创新基础。通过室内模型试验，研究了砂土中规则吸力式沉箱（RSC）和MSC在多向水平循环荷载作用下的承载性能。每个测试包括两个阶段：（a）在初始加载方向上施加载荷，以及（B）在从初始加载方向旋转一个偏转角的方向上施加载荷。结果表明：在第一阶段，吸力式沉箱平面平移运动方向与荷载方向一致;第二阶段，吸力式沉箱的运动方向与荷载方向不一致。这种现象在低载荷幅值下更加明显。当偏转角小于90°时，总累积位移随载荷循环次数的增加而增加。当偏转角分别为45°、45°和30°时，RSC和MSC的归一化总位移最大，分别为0.833和0.649，0.833。当偏转角大于90°时，总位移随偏转角的增大而减小。改变加载方向对RSC和MSC的卸载刚度值几乎没有影响。
The modified suction caisson (MSC) is an innovative foundation for offshore wind turbines. Model tests were conducted to study the bearing behavior of the regular suction caisson (RSC) and the MSC in sand under multidirectional lateral cyclic loads. Each test includes two stages: (a) the load was applied in the initial loading direction, and (b) the load was applied in the direction which rotate through a deflection angle from the initial loading direction. Results show that in the first stage, the translational motion direction of suction caisson in plane view coincides with the loading direction. In the second stage, the motion direction of the suction caisson doesn't coincide with the loading direction. This phenomenon becomes more obvious under low loading amplitude. When the deflection angle is less than 90°, total accumulated displacement increases with increasing the load cycles. The maximum normalized total displacements for the RSC (ζb= 0.833) and the MSC (ζb= 0.649, 0.833) were obtained when the deflection angles equal 45°, 45° and 30°. When the deflection angle value is higher than 90°, the total displacement decreases with increasing the deflection angle. Changing the loading direction has little effect on the unloading stiffness values for both the RSC and the MSC.
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影响因子：
1.6
作者：
Su, D.
通讯作者：
Su, D.
影响因子：
8.7
作者：
Xuefei Wang;X. Zeng;Xinyao Li;Jiale Li
通讯作者：
Xuefei Wang;X. Zeng;Xinyao Li;Jiale Li
裙边吸力沉箱对饱和介质砂中单调侧向荷载的响应
影响因子：
1.6
作者：
李大勇;张雨坤;冯凌云
通讯作者：
冯凌云
DOI：
10.1061/(asce)gt.1943-5606.0001782
发表时间：
2017-11
影响因子：
3.9
作者：
Jae‐Hyun Kim;Y. Choo;Dong‐Soo Kim
通讯作者：
Jae‐Hyun Kim;Y. Choo;Dong‐Soo Kim
影响因子：
5.3
作者：
D. Su;Jinhui Li
通讯作者：
D. Su;Jinhui Li