$11\mathrm{.}12$ Explain the principles and practices of reinforced concrete design for a multi$-$story building. Begin by discussing the fundamental properties of concrete and steel used in reinforced concrete structures. Describe the process of selecting appropriate concrete mixes and reinforcement types considering the structural requirements and environmental factors. Discuss the structural analysis methods employed in determining the loads and stresses acting on the building. Then, delve into the design considerations for different structural elements such as beams, columns, and slabs, highlighting the importance of factors like load distribution, safety margins, and serviceability. Finally, elaborate on the construction techniques and quality control measures necessary to ensure the integrity and durability of the reinforced concrete building throughout its lifespan. Provide relevant examples and references to industry standards and codes where applicable.