Abstract
A new method that simplifies the current static seismic torsion design procedure for buildings is proposed. Distribution of the shear forces among the storey-resistant elements designed by torsion and of the factors which affect the design eccentricity, specially accidental eccentricity, are studied. It is demonstrated that the effect of accidental eccentricity is always additive for the structural elements. There is given an in which the proposed procedure is applied; the results obtained agree with those calculated obtained with a traditional procedure of design.
Highlights
The current philosophy of seismic design is based on the assumptions that structures subjected to severe earthquakes must be able to resist significant inelastic deformations without detriment to their load capacity
Design Approach With The Proposed Ntc-2002[14]: in the building studied, the p-taf by using the proposed ntc-2002[14] will modify the design of the stiff element b in the storey 3. the total shear values for all the resistant elements and storeys of the building calculated with ptaf and corrected with the ntc-2002[14] regulations are shown in table 3.some observations about the torsional shear due to accidental eccentricity:for the j-th storey of a structure, in an extreme case, the i-th resistant element located farthest from the ct will have ζ i=1; equation (15) attains a maximum value of
In order to attain this goal, it is necessary to review the distribution of shear forces among storey resistant elements in buildings designed by static seismic torsion and to analyse the factors which affect the design eccentricity, accidental eccentricity
Summary
The current philosophy of seismic design is based on the assumptions that structures subjected to severe earthquakes must be able to resist significant inelastic deformations without detriment to their load capacity. For asymmetric buildings these inelastic deformations arise fundamentally from the translation and rotation of their storeys. Seismic torsion is included by distributing the shear force, due to this effect, among the resistant elements This shear force is computed by considering a torsion moment in each storey, obtained from the product of the storey shear force and a design eccentricity expressed in terms of the accidental and structural eccentricities
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