Unbonded Posttensioned Concrete Bridge Piers. I: Monotonic and Cyclic Analyses

The monotonic and cyclic behavior of a proposed unbonded, posttensioned concrete bridge pier system is studied using finite-element analyses. A procedure to evaluate seismic capacities based on results from the monotonic and cyclic analyses is described in the framework of a two-level approach considering functional- and survival-performance limits. A set of criteria to define functional- and survival-level displacement capacities for the system is developed. The proposed criteria represent improvements over existing criteria in that they are applicable to both conventional reinforced concrete structures and unbonded posttensioned structures. The monotonic and cyclic behavior of prototype single-column pier and two-column bent designs is presented. Monotonic analyses are performed to characterize the stiffness, strength, ductility, and limit-state behavior of these systems. Cyclic analyses are carried out to estimate energy dissipation capacity, residual displacements, and general hysteretic behavior. The influence of the degree of unbonded posttensioning on bridge pier behavior is examined. Using the finite-element results and the proposed criteria, seismic capacities of the prototype bridge pier systems are established.

[1]  Michael P. Collins,et al.  COMPRESSION RESPONSE OF CRACKED REINFORCED CONCRETE , 1993 .

[2]  Richard Sause,et al.  Moment Rotation Behavior of Unbonded Post-Tensioned Precast Concrete Beam-Column Connections , 2000 .

[3]  Sarah L. Billington,et al.  ALTERNATE SUBSTRUCTURE SYSTEMS FOR STANDARD HIGHWAY BRIDGES , 2001 .

[4]  Jan G. Rots,et al.  A 3D constitutive model for concrete based on a co-rotational concept , 1998 .

[5]  Pedro F. Silva,et al.  Development of a Performance Evaluation Database for Concrete Bridge Components and Systems under Simulated Seismic Loads , 2000 .

[6]  Chin Tung Cheng,et al.  SEISMIC DESIGN OF BRIDGE COLUMNS BASED ON CONTROL AND REPAIRABILITY OF DAMAGE , 1997 .

[7]  Mjn Priestley,et al.  SEISMIC RESPONSE OF PRECAST PRESTRESSED CONCRETE FRAMES WITH PARTIALLY DEBONDED TENDONS , 1993 .

[8]  M. J. N. Priestley,et al.  Seismic tests of precast beam-to-column joint subassemblages with unbonded tendons , 1996 .

[9]  M. J. N. Priestley,et al.  The PRESSS program : Current status and proposed plans for phase III , 1996 .

[10]  Bolong Zhu,et al.  Algorithm for Hysteresis Analysis of Prestressed-Concrete Frames , 1994 .

[11]  Sashi K. Kunnath,et al.  Seismic Response of Precast Concrete Frames with Hybrid Connections , 1998 .

[12]  Sarah L. Billington,et al.  SIMULATION OF STRUCTURAL CONCRETE UNDER CYCLIC LOAD , 2001 .

[13]  John F. Stanton,et al.  PRESSS Project 1.3: Connection Classification and Evaluation , 1991 .

[14]  Stephen Pessiki,et al.  Seismic behavior and design of unbonded post-tensioned precast concrete frames , 1999 .

[15]  Sri Sritharan,et al.  Nonlinear finite element analyses of concrete bridge joint systems subjected to seismic actions , 2000 .

[16]  M. J. Nigel Priestley,et al.  Myths and fallacies in earthquake engineering , 1993 .

[17]  John F. Stanton,et al.  A HYBRID REINFORCED PRECAST FRAME FOR SEISMIC REGIONS , 1997 .

[18]  Sri Sritharan,et al.  ENHANCING SEISMIC PERFORMANCE OF BRIDGE CAP BEAM-TO-COLUMN JOINTS USING PRESTRESSING , 1999 .

[19]  Sarah L. Billington,et al.  Unbonded Posttensioned Concrete Bridge Piers. II: Seismic Analyses , 2003 .

[20]  J. Mander,et al.  Theoretical stress strain model for confined concrete , 1988 .

[21]  Y. Kurama,et al.  Lateral Load Behavior and Seismic Design of Unbonded Post-Tensioned Precast Concrete Walls , 1999 .