Coastal and port structures represent a large economic investment for society during their lifetime. Therefore, there is a need for proper coastal planning and management. In order to do that, wave and current loads must be considered by determining their level where the coastal structure should resist, otherwise they may suffer extensive damage due to these environmental loads. In this study, a new frame of performance design for coastal structures which includes climate change effects is discussed as a future design methodology. Performance-Based Design considers a coastal structure’s performance determined by the amount of damage. In other words, the structure which is exposed to wave impacts should maintain its serviceability by limiting its damage, so that, its economic, operational, life-safety and environmental impacts are acceptable to the owner. The importance of this method is that it provides a possibility to the owners to work with the engineer in order to establish desired and acceptable levels of wave loads as the basis for a design. Also, it gives an opportunity to the engineer to design structures with their foreknown behavior against the design wave load levels. These performance objectives include two specifications; the hazard levels to which the structure is to be designed, and the permissible amount of damage when the structure is subjected to these hazard levels. This paper aims to explain the performance-based design methodology by giving the deformation-based reliability design for breakwaters and its applicability to the stability design. Since the methodology requires information on the extreme wave-height distribution near the design site, the effect of wave climate change on the performance-based design is investigated.

沿海和港口结构在其一生中为社会带来了巨大的经济投资。因此，需要适当的海岸规划和管理。为此，必须通过确定海浪和海流载荷的水平来确定沿海结构应抵抗的位置，否则它们可能会因这些环境载荷而遭受广泛破坏。在这项研究中，讨论了一种包括气候变化影响在内的沿海结构性能设计的新框架，作为未来的设计方法。基于性能的设计考虑了沿海建筑的性能，该性能由损坏程度决定。换句话说，受到波浪冲击的结构应通过限制其损坏来保持其可维修性，从而使其经济，可操作，所有者可以接受生命安全和环境影响。这种方法的重要性在于，它为业主提供了与工程师合作的可能性，以建立所需的和可接受的波浪载荷水平作为设计的基础。此外，它还为工程师提供了设计结构的机会，这些结构具有针对设计波浪荷载水平的已知行为。这些性能目标包括两个规范。结构要设计到的危险等级，以及当结构承受这些危险等级时允许的损坏量。本文旨在通过提供基于变形的防波堤可靠性设计及其在稳定性设计中的适用性来解释基于性能的设计方法。