Guyed Ocean Towers Under Seismic and Other Stochastic Loads

对锚固在塔底的非线性拉索进行了探索性研究，建立了保持塔底横向稳定的非线性拉索分析模型。每根拉力线由一根引线、一根拖线和一个用来限制钢丝绳张力的重物组成。对于正常的海况，需要一个相对僵硬的系统。然而，在幸存海况下，希望允许系统变得更顺应。这是通过使块状重量离开海底的静止位置来实现的，从而使系统更灵活，并降低了动态放大系数。这项工作将集中于发展一种在频域中的随机线性化技术，用于包含刚度和阻尼力的耦合非线性系统，并发展一种更准确和更有效的松弛绳索模型，以模拟绳索和集重与海底的动态接触。

An exploratory study is conducted to develop an analytical model for the nonlinear guy cables which anchor the bottom of an ocean tower to maintain its lateral stability. Each guy line consists of a lead line, a trailing line, and a clump weight to limit the tension in the cable. For normal sea condition a relatively stiff system is required. However, in survival sea states it is desired to allow the system to become more compliant. This is achieved by making the clump weight leave the resting position on the sea floor, thus making the system more flexible and decreasing the dynamic amplificaton factor. The effort will be focused on the development of a stochastic linearization technique in the frquency domain for a systems involving coupled nonlinearities in stiffness and damping, and on the development of a more accurate and efficient model of slack guylines to simulate the dynamic contact of the guyline and clump weight with the ocean bottom.