Abstract
The foundation of buildings commonly assumed to be fixed in practical seismic response analysis. However, in severe earthquake loadings, the uplift phenomenon would be occurred due to the lack of tensile strength in the subsoil. This research aims to investigate this nonlinear phenomenon to obtain the actual behavior of diagonally braced steel frames. For this purpose, four 4-, 8-, 12-, and 15-story X-braced frames are modeled in the software framework of OpenSees. Some key parameters such as the natural period of vibration, inter-story drift ratio, base-shear force, the axial force along with the plastic deformation of braces are examined in two cases consist of fully and partially restrained supports. In the latter case, gap link elements (no tension behavior) are employed to model the soil–structure interaction (SSI). Overall, the results showed that by occurring the uplift the first period and inter-story drifts of the structure are increased; while, the base-shear, axial force and plastic deformation of braces will be reduced.
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Mahmoudi, M., Hoodinshad, M. & Jalili Sadr Abad, M. The effects of foundation uplift on seismic response of diagonally braced steel frames. Asian J Civ Eng 21, 885–902 (2020). https://doi.org/10.1007/s42107-020-00247-x
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DOI: https://doi.org/10.1007/s42107-020-00247-x