Seismic-Resistant Bridge Columns with Ultrahigh-Performance Concrete Segments
The flexural capacity of a well-designed RC column deteriorates under extreme ground motion as a result of crushing of the core concrete and buckling of the longitudinal bars in the plastic hinge regions. Thus, it is important to minimize damage at the plastic hinge region to develop high-performance bridge columns. A column that uses ultrahigh-performance concrete (UHPC) segments at the plastic hinge region is proposed to address this issue. Three reduced-scale columns were constructed and tested at the Tokyo Institute of Technology in Japan. Two of the columns with different plastic hinge details were investigated using bilateral cyclic loading. The first column had a reinforced concrete core encased in an UHPC jacket. The second column had an UHPC hollow-core plastic hinge combined with posttensioning. Both columns were designed to have approximately the same nominal strength. They were tested under orbital bilateral cyclic loading customized to impose flexural deformations and investigate the possibility of twisting of the columns. The column that had a solid concrete core was able to carry the applied axial load to a drift of 6%. The posttensioned column was able to carry the applied axial load to a drift of 3.5%. The third column was tested to investigate the seismic performance of the first column, which had a concrete core, under hybrid simulation. The proposed UHPC column exhibited good performance for a seismic-resistant column. Energy dissipation and hysteresis damping were also calculated. Two analytical approaches were used to estimate the columns' capacities.
S. Ichikawa et al., "Seismic-Resistant Bridge Columns with Ultrahigh-Performance Concrete Segments," Journal of Bridge Engineering, vol. 21, no. 9, American Society of Civil Engineers (ASCE), Sep 2016.
The definitive version is available at https://doi.org/10.1061/(ASCE)BE.1943-5592.0000898
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Axial loads; Concretes; Cyclic loads; Earthquake engineering; Energy dissipation; Reinforced concrete; Seismic design; Seismology; Analytical approach; Damage resistants; Flexural deformations; Plastic hinge region; Reinforced concrete core; Self centering; Tokyo Institute of Technology; Ultra high performance concretes (UHPC); Bridges; Damage-resistant columns; Segmental columns; Self-centering
International Standard Serial Number (ISSN)
Article - Journal
© 2016 American Society of Civil Engineers (ASCE), All rights reserved.
01 Sep 2016