The conceptual design of bridge structures can significantly influence their behaviour under seismic action. Furthermore, the implementation of a suitable type of structure and the proper geometric parameters of the elements of the substructure lead to the optimisation of the bridge not only from the point of view of the initial costs (price and execution time), but also regarding damage due to design seismic action. This paper focuses on the methods for seismic response reduction of bridges under identical seismic hazard. Particular attention is given to the influence of the stiffness of the substructure and the possibility of ductile behaviour in linear spectral analysis. Additionally, the possible values of the behaviour factors according to Eurocode 8 are estimated. The possibility of applying different behaviours factors in the longitudinal and transverse directions of the bridge is analysed in order to highlight the irrelevance of such a procedure in some of the studied examples.
Topurova et al. (Wed,) studied this question.
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