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Basic pushover methods, which are in practice today, are considered not to be reliable for structures having significant higher mode participation. Efforts are being continued worldwide for modifying conventional nonlinear static procedures (pushover methods), to make them applicable for the seismic assessment of irregular building structures. This study aims at developing a load pattern to be used with the basic nonlinear static procedures for the analysis of two-dimensional reinforced concrete frames with vertically asymmetric setbacks. The accuracy of the basic nonlinear static procedures when applied to such buildings is also verified against the results of nonlinear dynamic analyses. The results are not conclusive in identifying any single pushover method absolutely suitable for such buildings. However, the load pattern proposed in this article can be used with all the basic nonlinear static procedures considered in this study, to obtain the displacement demands of bare frames with vertically asymmetric setbacks. Another load pattern is identified to predict their base shear demands. It is also understood that masonry in-filled frames cannot be analysed with a single load pattern throughout the analysis. A suitable method for analysing reinforced concrete frames with asymmetric setbacks using the basic nonlinear static procedures is evolved at the end.
Advances in Structural Engineering – SAGE
Published: Jun 1, 2016
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