Abstract
Partial precast bridge column (PPBC) is an innovative column composed of upper precast segments and cast-in-place (CIP) base. The CIP base and precast segments are connected by unbonded posttensioned tendons. It is expected to achieve self-centering capacity as well as energy dissipating capacity during earthquakes. However, the research about damage mechanism and seismic performance of PPBC are still scarce. To investigate the seismic performance, quasi-static cyclic tests of one PPBC and a referenced CIP column are conducted in this study. Unlike CIP column, the PPBC shows excessive joint opening and obvious rocking characteristics during cyclic loadings. Slight concrete cracking in CIP base and severe concrete spalling at upper joints implies limited ductility of PPBC. Moreover, PPBC indicates smaller horizontal force, minor residual drifts and lower energy dissipation when compare with CIP columns. Based on damage distribution and deformable modes, increased prestress force, elevated CIP base and enlarged prestress ratios are analyzed to improve the anti-seismic behavior of PPBC. With cautious simulations and comprehensive comparisons, elevated CIP base and enlarged prestress ratios are validated to enhance the energy-dissipating capacity of PPBC.
Published Version
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