#$82828$ How does the theory of structural mechanics contribute to the operation of civil engineering projects? In your response, consider the fundamental principles of statics, dynamics, and structural analysis, and how they inform the design, construction, and maintenance of various civil engineering structures. Additionally, discuss the role of material properties and their behavior under different loading conditions, as well as the importance of considering environmental factors such as wind, seismic activity, and soil mechanics in the planning and execution of civil engineering projects. Finally, elaborate on the significance of incorporating safety factors and codes$/$regulations into the design process to ensure the structural integrity and longevity of infrastructure projects.