The drilling rig derrick of floating platform is often subjected to big dynamic loadings from marine environmental pressure and platform movement. In order to evaluate the influence of platform movement on dynamic responses of derrick, a derrick model and six-degree-of-freedom (6-DOF) moving boundaries, which were based on one offshore floating platform and the matching tower-shaped derrick, were designed according to similarity principle and test of the dynamic derrick was carried out by means of large-scale seism simulation test-tables. Acceleration and dynamic strain were measured under vibrational excitations with each single DOF and coupling 6-DOF, which modeled platform movement under operating condition, survival condition and design survival condition. It′s found that the derrick is the most impressible to pitch and heave driving, and relatively insensitive to yaw driving. Hook load has little effect on derrick′s dynamic responses. Based on the movement of the platform under the combined loads of the wave, current and wind that are from different directions, we find that the dynamic response of the derrick is the strongest with the incidence angle of 180 degree. Experimental results would provide reference for design of the matching derrick for drilling rig of deep-water floating platform.%深水浮式平台钻机井架在海洋环境载荷和平台运动条件下会受到较大的动态载荷.为评价浮式平台运动对井架动力响应的影响,以某海洋浮式平台及其配套的塔型井架为依据,按照相似原理设计了井架模型及其平台的6自由度运动条件,利用大型地震模拟试验台阵系统实施了动态井架试验.对振动台沿6个自由度方向单独激励以及模拟作业工况、生存工况和设计生存工况的6自由度耦合激励条件下井架各测点的加速度和动态应变进行测试.发现井架对于纵摇和垂荡激励最敏感,而对艏摇激励不敏感;钩载的变化对井架动态响应的影响不大;基于平台在风浪流沿不同方向入射的运动响应,发现在迎风迎浪迎流条件下井架的动态响应幅值最大,受力状况最恶劣.
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