$101\mathrm{.}233\mathrm{.}420$#"How does the concept of 'shear stress' in civil engineering contribute to the understanding of material behavior? Discuss its significance in determining the stability and integrity of structures. Additionally, explore its applications in various construction scenarios, highlighting key factors that influence shear stress distribution. Provide examples illustrating how engineers mitigate shear stress$-$related issues to ensure structural safety and longevity."