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Behavior of bridge piers with ductile fiber reinforced hinge regions and vertical, unbonded post -tensioning
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Behavior of bridge piers with ductile fiber reinforced hinge regions and vertical, unbonded post -tensioning
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Dissertation
Behavior of bridge piers with ductile fiber reinforced hinge regions and vertical, unbonded post -tensioning
2004
Overview
This thesis reports the findings of an experimental study of the behavior of an innovative new bridge pier system. The piers employ a modern construction technique using precast segments joined with vertical, unbonded post-tensioning (UBPT) strands to attain the construction benefits of precasting. The system also uses a newly developed, highly ductile fiber reinforced cementitious composite (DFRCC) in potential hinge regions to achieve improved structural behavior under cyclic lateral loads. This pier system was designed with the goal of achieving some hysteretic energy dissipation and ensuring ductility in an unbonded system while maintaining the advantage of small residual deformations. The scope of the thesis covers two individual but related investigations. The first examined creep, shrinkage and permeability of DFRCC materials, and the second covered the testing of the prototype pier structures. The goal of the study as a whole is to evaluate critically the structural performance of the pier system described herein under cyclic lateral loads with an eye to eventual implementation into structural design practice. The experimental investigation of the time-dependent deformations of DFRCC found that these materials exhibited significantly greater magnitudes of creep than identical materials without fibers. The differing cracking behavior of the DFRCC relative to unreinforced materials was found to play an important role in the time-dependent deformation as well. The testing of prototype piers demonstrated the intended small residual deformations and hysteretic energy dissipation but also limited ductility. Ductility and lateral load capacity were found to be highly dependent upon the behavior and location of match-cast construction joints. The DFRCC at hinge regions allowed much less sudden strength loss after achieving lateral load capacity and resulted in less stiffness degradation than did concrete hinge regions. With alternate detailing it appears likely that the performance of the system could be improved considerably in terms of lateral load capacity, ductility, energy dissipation, and ease of repair. The results are encouraging for eventual implementation of this pier system in seismic zones.
