Experimental Investigations of the Response of Suction Caissons to Transient Combined Loading
Experimental Investigations of the Response of Suction Caissons to Transient Combined Loading
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DOI：
10.1061/(asce)1090-0241(2004)130:3(240
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发表时间：
2004-03
影响因子：
3.9
通讯作者：
B. Byrne;G. Houlsby
中科院分区：
文献类型：
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作者：
B. Byrne;G. Houlsby
基础的组合荷载是土木工程中的一个基本问题，特别是在环境条件恶劣的海上工业中。大的力矩和水平荷载以及垂直荷载可施加到基础上。此外，当波浪通过结构时，载荷可能会迅速变化，因此需要考虑瞬态效应。当设计浅基础时，例如吸力沉箱，目前对基础如何响应这些载荷的理解存在不确定性。本文介绍了实验，进行模型吸力沉箱基础，其中典型的循环荷载条件下应用。基脚埋在油饱和砂中，因此无量纲排水时间与典型的海上条件相当。大多数测试都是在垂直荷载保持不变的情况下进行的，以模拟结构自重，同时施加真实的“伪随机”力矩和水平循环荷载。在不同的垂直荷载下进行了实验，结果表明，响应取决于垂直荷载水平。无量纲关系的建立，占这种依赖性。令人惊讶的是，加载速率对所进行的实验的载荷-位移行为几乎没有影响。
Combined loading of foundations is a fundamental problem in civil engineering, particularly in the offshore industry where harsh environmental conditions occur. Large moment and horizontal loads may be applied to the foundation as well as vertical loads. Also, as the waves pass a structure, there can be rapid changes in the loads, so that transient effects need to be considered. When designing shallow foundations, such as suction caissons, there is uncertainty in the current understanding of how the foundation responds to these loads. This paper presents experiments, performed on model suction caisson foundations, where typical cyclic loading conditions are applied. The footing is embedded in oil-saturated sand so that dimensionless drainage times are comparable with the typical offshore conditions. Most of the testing was carried out with the vertical load held constant, to mimic the structural dead weight, while realistic ''pseudorandom'' moment and horizontal cyclic loads were applied. Experiments were carried out at different vertical loads, showing that the response depends on the vertical load level. Nondimensional relationships were established which accounted for this dependency. Surprisingly, the rate of loading had little impact on the load-displacement behavior for the experiments undertaken.