Explain the principles behind the design and construction of suspension bridges, including the factors influencing the selection of materials, structural components, and anchorage systems. Assess the role of dynamic loading, wind effects, and seismic considerations in the design process, and discuss the measures taken to ensure stability, durability, and safety of suspension bridges under varying environmental conditions. Analyze the challenges associated with maintenance and rehabilitation of existing suspension bridges, and propose innovative strategies for enhancing their structural integrity and resilience against natural hazards and long$-$term deterioration.