Structural design is the process of proportioning the structure to safely resist the applied forces and load effects in the most resource-effective and friendly manner. The term “friendly” refers to the aspect of design dealing with environmental friendliness, sustainability, ease of construction, and usability that are not explicit part of the strength consideration. Resources refer to the use of material, labor, time, and other consumables that are used to construct and maintain the structure. The mission of structural design is to obtain a rational structural form that can withstand the design load and satisfy the requirements of safety, durability, and economy. Three elements are included in the structural form: (i) reinforced or not, (ii) shape of the structure, and (iii) size of the structure.