CRITERIA OF LIMIT STATES FOR THE DESIGN OF STEEL STRUCTURES BASED ON COMPUTER NUMERICAL MODELS

Abstract

A very important place in the design of building structures is occupied by the issue of assigning criteria for limit states. The criteria used in current practice cannot be fully applied to design based on computer numerical models. The criteria must be unambiguously expressed in precise terms and values of structural mechanics and in a form that is "understandable" to a computer. In the study, it is proposed to apply a single criterion for all limit states, expressed as a zero gradient of "response" (load–displacement curve). It can be argued that the zero response criterion has good physical validity. The great advantage of the zero response criterion is its generality. It is equally suitable for structures made of any materials and for all forms (types) of failure. The zero response criterion works in all these cases and eliminates the need to look for any additional formulations. Also, the formulation of the criterion of limit states based on the concept of "Response" allows us to assess the degree of their danger. To do this, it is enough to determine the value of the "Response" of the structural element in the states following the assumed limit.