8B. ANALYSIS PART 2

CHAPTER 8B 'ANALYSIS' 16 CEE §5.5.1.1.1 Structural element deficiency index In order to determine the magnitude and distribution of the inelastic behaviour requirements in the primary load-bearing structures elements of the structure bearing the seismic actions, a preliminary elastic analysis of the building is required in order to calculate for each of its elements the ratios ('indices of inadequacy') λ = S / Rm , (5.1) where S is the intensive magnitude (moment) due to the actions of the seismic combination (§4.4.2), where the seismic action is taken without reduction (the elastic spectrum of EC 8-1 is used), while Rm is the corresponding available resistance of the element, calculated the basis of the average values of the strengths of the materials (see §5.1.4). The λ ratios will be calculated, both for valuation and for redesign, on each primary load-bearing element. The highest λ ratio for an individual element on a floor (the most overloaded) will be considered a critical λ ratio for the floor. CAN.EPE §5.5.1.2 Morphological regularity The scope of each method mentioned in §5.1.1 depends on the morphological characteristics of the building, which influence its behaviour under seismic actions. The building is considered to be morphologically normal when the conditions listed in EC 8-1 are met. The EIA sets specific requirements for the application of Elastic Static (EC-8_Greek Elastic Static) and Elastic Dynamic (EC-8_Greek Elastic Dynamic) analysis In addition, the EIA sets conditions for the application of the pushover analysis, which in order to be applied, the influence of the upper eigenmodes must not be significant (EIA §5.7.2 (b) INFLUENCE OF THE UPPER PROPERTIES). (see §Control of the influence of the higher idioms ) §5.5 For performance level A, the elastic static analysis (EC-8_Greek Elastic Static) may be applied without the conditions in § 5.5.2. §5.5.2 Conditions of application (Elastic Static Analysis)(EC-8_Greek Elastic Static) For the elastic methods there is no question of conditions of application relating to the level of confidence in the data. α. The application of the static elastic method is permitted (for performance levels B or C, see § 5.5) when all of the following conditions are met: (i) For all the main elements λ≤2.5, or for one or more of them λ>2.5 and building is morphologically normal. (ii) The fundamental eigenperiod of the building T0 is less than 4 Tc or 2s, (see EC 8-1).