چكيده به لاتين
Abstract:
The main objective of this study is to evaluate the seismic performance of isolated cable-stayed bridges with triple friction pendulum bearings (TFPBs). This research investigated two different operating cable-stayed bridges (Karoon 4 Oil Pipe Line and Lali cable-stayed bridges) in Iran.
The most important feature of each isolated structure is its isolators. In this research TFPBs have been utilized. Force-displacement behavior of TFPBs is investigable in five various regimes for most adaptable configuration.
The Non-linear Time History Analysis (NTHA) is used to evaluate and compare the results of models with elastomeric bearings (include neoprene) and TFPBs. Ten various far-field earthquake records with different origins, mechanisms, intensity and duration are used for analysis. Plastic hinges are also considered for nonlinear structure behavior in substructures of bridges.
Various demands are investigated included the base shear and base moment, deck acceleration, displacement of isolation system, hysteretic behavior of isolators, axial force of cables and plastic hinges performance state. In this regard, the base shear and base moment, deck acceleration and axial force of cables are significantly reduced, but the displacement of TFPBs is higher than the elastomeric bearings. Furthermore, the Performance states of plastic hinges in isolated substructures with TFPBs are in immediate occupancy level but as-built substructures with elastomeric bearings are in collapse level.
Keywords: Seismic isolations, Cable-stayed bridges, Triple friction pendulum bearings (TFPB), Non-linear Time History Analysis
