Effects of torsion factors on simple non-linear systems using fully-bidirectional analyses
✍ Scribed by De-La-Colina, J.
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 216 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0098-8847
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✦ Synopsis
An ensemble of earthquake records is used to carry out non-linear analyses of simple torsionally unbalanced systems considering both resisting elements and earthquake components along two perpendicular directions. These fully bidirectional analyses are focused to study the e!ect of the following factors: (i) seismicforce reduction factor; (ii) factors and used to compute the design eccentricity; (iii) initial lateral period; and (iv) initial sti!ness eccentricity. Results indicate that the ampli"cation factor can be speci"ed as a function of the force reduction factor, the lateral uncoupled period, and the sti!ness eccentricity. It is concluded that the coe$cient depends on the lateral period, the sti!ness eccentricity, and the geometrical eccentricity. It was observed that negative shears caused by torsion should be neglected in the design of the sti! element, particularly in the case of systems with large sti!ness eccentricity. Results suggest that additional studies should be performed to verify the assumed (partial) equivalence between unidirectional (resisting elements and earthquake components along one direction only) and fully bidirectional analyses to study building torsion problems.