Performance Assessment of the Roll-N-Cage (RNC) Isolators impacts on Progressive Collapse Behavior in Cable-Stayed Bridges

Document Type : Research Article


Civil Engineering Department, Kurdistan University, Kurdistan, Iran


Structural safety can be threatened by the failure of one member of the structure if it fails other members of the structure. This phenomenon, which has recently attracted the attention of designers and engineers, is known as progressive collapse. Progressive collapse, especially during a severe earthquake, could threaten the general stability of structures and lead to their collapse. This research has been aimed to investigate the performance of the isolated cable-stayed bridges with modern Rolled-N-Cage (RNC) isolators under near-fault seismic loads and after losing a cable. In this regard, Bill Emerson isolated Cable-Stayed Bridge is implemented under three near-fault seismic events and assessed the results of the cable loss. Then, the buffer mechanism of the RNC isolator and its effects against preventing the progressive collapse is evaluated on preventing progressive collapse of the bridge. The results indicate that the RNC isolator with an activated buffer mechanism appropriately decreases the permanent displacement under near-fault seismic loads. While, not using the RNC isolator and buffer mechanism, causes the damage propagation and progressive collapse of the bridge.


Main Subjects

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