ABSTRACT

Dynamic environmental loads, such as winds and waves, make the stability of offshore structures at high risk, requiring reliable yet efficient control elements to ensure the stability of such structures under lateral loads. Among the variety of control elements that have been developed to enhance the stability of a structure, shape memory alloy (SMA)-based control elements are promising as they are low-cost, easy to embed into the main control element, and do not need an external power supply. However, cyclic loads may highly influence the performance and functionality of SMA-based elements. The present work investigates the effects of pre-straining SMA components in energy dissipation capacity and its force-displacement behaviour under cyclic loads. The results of experimental tests show that pre-straining SMA by 1.7% significantly reduces the residual deformation and increases the energy dissipation capacity of structures under the short and long-term cyclic loads.

摘要

动态环境载荷（例如风和波浪）使海上结构的稳定性处于高风险中，因此需要可靠而有效的控制元件来确保此类结构在侧向载荷下的稳定性。在为增强结构稳定性而开发的各种控制元件中，基于形状记忆合金（SMA）的控制元件具有低成本，易于嵌入主控制元件且无需使用的优点，因此前景广阔。外部电源。但是，周期性载荷可能会严重影响基于SMA的元件的性能和功能。本工作研究了预应变SMA组件在能量耗散能力及其在循环载荷下的力-位移行为的影响。实验测试结果表明，SMA的预应变为1。