EXAMPLE 6. BUILDING VALUATION & REDESIGN STUDY

EXAMPLE 6: "STUDY FOR THE VALUATION AND REDESIGN OF A BUILDING ACCORDING TO THE CANC. 55 2.3 Influence of the upper peculiarities A further check is contained in paragraph 5.7.2(b) of the EIA and relates to the influence of higher eigenmodes . The CAN states that for pushover to apply, the influence of the higher eigenmodes must be insignificant. The criterion for assessing how significant the influence is is as follows: In order to check this condition, an initial dynamic elastic analysis is required where the seismic shear stress is calculated, for each floor and for each direction of the earthquake, once for those eigenmodes that activate at least 90% of the mass of the building and once for the fundamental (per direction) eigenmodes. • The influence is considered significant when, even on one floor and in one direction, the ratio of the cutting force from the many eigenmodes (Vall) to the cutting force from one eigenmode (V1) is greater than 1.3 . ⮚ This criterion was only incorporated in the scenarios of the EC8-Greek Dynamic Analysis . The results are displayed in three places: 1. In the graph within the analysis by selecting "Upper Eigenmode Influence Check"