Of various factors in

These differences are determined by: the type of structure (rod or continued, flat or spatial); adopted by the criterion of optimality; the choice of variable parameters (geometric dimensions of the structure that determine its configuration; the shape of the transverse sections of the elements of the system; the size of these sections; the structure of the structure; the volume of different types of work, which varies during variation of variable parameters, for example, the length of welds or the amount of conjugation, etc.) And if you need reliable doors, firefighter metal doors EI 30 - exactly what will increase the safety of your room; the nature of the accepted restrictions (conditions of the limiting state of the entire structure or checking stresses at the elastic stage of its operation; comprehensive accounting of all restrictions in the process of optimization or subsequent verification of some of them; recording restrictions in the form of equations connecting variable parameters with regulatory characteristics, or in the form of inequalities) ; the completeness of accounting of various factors in the expression for the target function (changing its own weight in the process of changing the designed parameters; the effect of temperature, the possibility of repeated loads, taking into account several independent loads or one, most significant, etc.); accepted simplifications in the mathematical formulation of the task (linarization of the initial equations, close methods of analysis of strength, stiffness and stability); choosing a mathematical optimization apparatus.