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- W2921137075 abstract "The mass of substructure is a main component of isolated bridges that affects the natural period and consequently forces and displacements of isolated bridges. The substructure mass consists of four components including pier mass, cap beam mass, pier rotational moments of inertia, and cap beam rotational moments of inertia. This paper investigates the effects of these components on the period of first longitudinal and transverse modes of multi-column continuous-span isolated bridges. For this purpose, 3-DOFs and 2-DOFs analytical models of a multi-column isolated bridge are developed and the natural periods of the models are validated in two horizontal directions. Moreover, the bridges design codes like AASHTO, ignore completely the substructure mass in the simplified method and present a SDOF analytical model for isolated bridges. The AASHTO SDOF model is not appropriate for all isolated bridges, because the increase in the stiffness ratio of the isolator to the substructure, increases the errors in calculating the fundamental period of the model. To overcome this limitation, a modified SDOF model is presented in this paper. In the proposed model, the substructure mass participation (SMP) is added to the superstructure. The value of SMP depends on the geometry of bridges and stiffness of the substructure and isolators. The analysis results show that using this model instead of the AASHTO model, decreases the errors significantly. Therefore, this model is recommended as a simple and accurate approach." @default.
- W2921137075 created "2019-03-22" @default.
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- W2921137075 date "2019-08-01" @default.
- W2921137075 modified "2023-10-05" @default.
- W2921137075 title "Effects of substructure mass participation on natural period of multi-column base isolated bridges" @default.
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- W2921137075 doi "https://doi.org/10.1016/j.istruc.2019.03.002" @default.
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