Knowledge Level (TBDY)

In order to choose the admissible type of analysis and the appropriate confidence factor values, the following three knowledge levels are defined:

Limited Knowledge
The limited knowledge level corresponds to a state of knowledge where information is obtained from design drawings with sufficient information to analyse component demands and calculate component capacities. The design drawings show the configuration of the gravity load system and seismic-force-resisting system with sufficient details. Information is verified by a visual condition assessment. In the absence of sufficient information from design drawings, incomplete or nonexistent information is supplemented by a comprehensive condition assessment, including destructive and non-destructive investigation.

Comprehensive Knowledge
The comprehensive knowledge level corresponds to a state of knowledge where information is obtained from construction documents including design drawings, specifications, material tests records, and quality assurance reports covering original construction and subsequent modifications to the structure. Information is verified by a visual condition assessment. In cases where construction documents are incomplete, missing information is supplemented by comprehensive condition assessment, including destructive and non-destructive investigation. In the absence of material test records and quality assurance reports, material properties are determined by comprehensive materials testing in accordance to TBDY, Chapter 15.