ABSTRACT
The total seismic force FT is then distributed to each storey by multiplying it by specified distribution coefficients di. The force Fi acting at storey i results in
(6.2) Structures may exhibit 'irregularities', which affect the distribution and magnitude of seismic forces acting on the various resisting elements. These can be classified in two categories:
• irregularities in the horizontal plane of the structure, mainly asymmetry, leading to significant eccentricities and subsequently to torsional forces;
When the structure is very slender or presents significant irregularities, we shall refer to it as a special structure and shall determine the seismic forces based on a dynamic analysis, usually a modal analysis (see section 6.2).
