8B. ANALYSIS PART 2

CHAPTER 8B 'ANALYSIS' 104 The criteria describe vulnerability factors that have a decisive influence (individually and/or in combination) on the seismic behaviour of a building. In this methodology 13 criteria are considered, numbered K1 to K13. CALIBRATION OF CRITERIA The criteria are rated on a whole number on a 5/level scale, where 1 corresponds to the highest load (= reduction of seismic resistance) of the building and 5 to the lowest. (1≤βi≤5) The calibration of the criteria aims to assess the degree of burden of each vulnerability factor by examining their intensity and extent in the whole building. OVERRIDING CRITERION A criterion is considered to be exceeded when its intensity and extent exceeds a threshold beyond which the general stability of the building is affected. In the proposed methodology, only three criteria can be considered supercritical, under the conditions set out in their description. These are the first 3 criteria: Static failure damage, oxidation of the reinforcement and the magnitude of the reduced axial load of the columns, which can also take a zero value βi=0. If even one of the criteria is identified as supercritical, then the building is classified in a special category entitled "buildings with supercritical vulnerability elements". It should be noted that in these cases the B-Section Pre-Seismic Check will be completed (by determining the seismic capacity index) by scoring the criterion with βi=0. Buildings founded on soils of class S1 or S2 are also classified in the same category (see below on soil factor S).