$...........$Discuss the concept of resilience in civil engineering and its relevance to designing infrastructure that can withstand natural and man$-$made disasters. What are the key principles and strategies involved in enhancing the resilience of civil structures? Provide examples of how resilience can be integrated into the design and construction of buildings, bridges, and other infrastructure to mitigate the impact of events such as earthquakes, floods, and terrorist attacks. Additionally, address the challenges and considerations involved in balancing resilience with cost, aesthetics, and functionality.