Title:
Resilience Under Non-Stationary Extreme Design Loads Due to Climate Change for Coastal Concrete Structures
Author(s):
Liu
Publication:
Web Session
Volume:
ws_S23_Liu.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
4/2/2023
Abstract:
Coastal concrete structures are subjected to more frequent extreme events due to climate change such as hurricanes, storm surges, and tsunamis. The extreme events occur within a short period of time (e.g., a hurricane only lasts a few hours or days) and may be recurrent several times during a typical design lifetime of 50 or 75 years. Currently, these non-stationary extreme design loads are treated as rare events in the design codes without taking into account of the effects of climate change such as the increased frequencies and intensities of winds and floods. In addition, the local or regional effects of climate change have not been addressed by current design codes. This paper briefly reviews the random variables and corresponding probability density functions (PDFs) that are related to extreme design loads in current design codes and updates these PDFs by taking into account of the effects of climate change. The performance-based approaches will be proposed and the provisions that incorporate the local or regional effects of climate change will be addressed. Moreover, resilience will focus on reducing the extreme load effects, including the use of permanent and/or temporary barricades and equipment as necessary before, immediately before, and during the extreme events. Since modern weather forecast techniques may reliably predict the occurrences of the extreme events with sufficient lead time, the temporary barricades may be built in time to reduce or eliminate the damages caused by the extreme events. For example, adding temporary pumps and drainage may significantly reduce the extreme flood loads that are applied to concrete dry docks. A site-specific approach will be proposed, based on life cycle cost-benefit analysis, and optimization algorithms will be provided. Finally, the preventive risk mitigation measures such as the designated weak areas/links or modular design of connection will significantly reduce the extreme load effects.