We investigate the effects of a brace-viscous damper system on the dynamic response of offshore platforms. To do this, offshore jacket platforms with various distributions and three different configurations of brace-viscous damper systems - toggle, chevron, and diagonal configurations - and a wide range of brace stiffness are numerically modelled under the loading of irregular waves in ANSYS software. The dynamic response of the developed numerical model and its various brace-viscous damper configurations are validated against literature experimental and numerical results. Such a validation revealed an excellent agreement between the numerical results and the benchmark data. The results suggest that the standard deviation of the platform displacement given by a toggle configuration is less than that due to the chevron and diagonal configurations. Moreover, the maximum reduction of the base shear force is achieved by the application of the toggle configuration. Regarding the brace stiffness (area), for a reference damping coefficient of 500 N.m/s, a 54% increase in the brace area (from 42 to 91.8 mm²) results in a 21.26%, 38.61%, and 17.57% reduction in the structure displacement response for the diagonal, chevron, and toggle configurations, respectively. Using the results of the numerical simulations, we propose the spatially-optimized distribution of the brace-viscous damper system. Comparing the numerical results of this paper with those of field observations it was shown that the viscous damper with toggle configuration outperforms both the viscoelastic damper and uncontrolled platforms in terms of dynamic response.

我们研究了支撑-粘性阻尼器系统对海上平台动力响应的影响。为此，在ANSYS软件中，在不规则波浪的加载下，对具有各种分布和三种不同配置的支撑-粘滞阻尼器系统的肘节，人字形和对角线构型以及大范围的支撑刚度进行了海上建模。相对于文献实验和数值结果，验证了所开发数值模型及其各种撑杆-粘滞阻尼器配置的动力响应。这样的验证揭示了数值结果与基准数据之间的极好的一致性。结果表明，由肘节构造给出的平台位移的标准偏差小于人字形和对角线构造引起的位移。此外，通过应用肘节结构实现了基本剪切力的最大减小。关于支撑刚度（面积），对于500 Nm / s的参考阻尼系数，支撑面积增加了54％（从42到91.8 mm²）分别导致对角线，人字形和肘节式配置的结构位移响应降低21.26％，38.61％和17.57％。利用数值模拟的结果，我们提出了支撑-阻尼阻尼系统的空间优化分布。将本文的数值结果与现场观测结果进行比较，结果表明，具有肘节式结构的粘滞阻尼器在动力响应方面优于粘弹性阻尼器和不受控制的平台。