Describe the theoretical principles and methodologies used in structural analysis within civil engineering, emphasizing how these principles are applied to ensure the stability and integrity of various structures. Discuss the different types of loads and forces that must be considered during the design phase, including dead loads, live loads, wind loads, and seismic forces. Explain how factors such as material properties, cross$-$sectional geometry, and support conditions influence the behavior of structures under these loads. Furthermore, elaborate on the role of computational methods and software tools in modern structural analysis, highlighting their advantages and limitations compared to traditional analytical techniques. Include in your discussion the importance of safety factors and codes of practice in ensuring that the designed structures meet the necessary safety and performance standards. How do engineers use these theoretical foundations to address challenges related to structural failure, resilience, and sustainability in the built environment?