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Earthquakes and Structures Volume 12, Number 5, May 2017 , pages 543-557 DOI: https://doi.org/10.12989/eas.2017.12.5.543 |
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A new approach for 3-D pushover based analysis of asymmetric buildings: development and initial evaluation |
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Dimitrios K. Baros and Stavros A. Anagnostopoulos
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| Abstract | ||
| Results of an extensive study aiming to properly extend the well known pushover analysis into 3-D problems of asymmetric buildings are presented in this paper. The proposed procedure uses simple, 3 DOF, one-story models with shear-beam type elements in order to quantify the effects of inelastic torsional response of such buildings. Correction coefficients for the response quantities at the \"stiff\" and \"flexible\" sides are calculated using results from non-linear time history analyses of the simple models. Their values are then applied to the results of a simple, plane pushover analysis of the detailed building models. Results from the application of the new method for a set of three, conventionally designed, five-story buildings with high values of uniaxial eccentricities are compared with those obtained from multiple non-linear dynamic time history analyses, as well as from similar pushover methods addressing the same problem. This initial evaluation indicates that the proposed procedure is a clear improvement over the simple (conventional) pushover method and, in most cases, more accurate and reliable than the other methods considered. The accuracy, however, of all these methods is reduced substantially when they are applied to torsionally flexible buildings. Thus, for such challenging problems, use of inelastic dynamic analyses for a set of two component earthquake motions appears to be the preferable solution. | ||
| Key Words | ||
| asymmetric buildings; torsional behavior; pushover analysis; shear beam models | ||
| Address | ||
| Dimitrios K. Baros and Stavros A. Anagnostopoulos: Department of Civil Engineering, University of Patras, Patras, 26500, Greece Dimitrios K. Baros: Department of Civil Engineering, Technological Educational Institute of Western Greece, Patras, 26334, Greece | ||