Seismic Performance of Shear Controlled Src Composite Columns

Abstract eng:
This paper addresses experimentally the cyclic performance of older steel reinforced concrete (SRC) composite columns that resemble existing buildings and bridges of pre 1980s construction; prior to enforcing seismic details. Two test specimens representing exterior columns modeled based on a typical seismic design of a 20-story prototype gravity existing building are constructed and tested under quasi-static lateral displacement cyclic loading and high axial compression loads. The tested columns include non-seismic widely spaced hoops with 90 degree hooks; thus the columns are considered shear and confinement deficient. Test parameters include target failure mode and axial load ratio. The tests aim to quantify existing SRC columns seismic shear strength and deformability along with a preliminary attempt to establish backbone curve recommendations. The results show relatively early shear failure of the tested columns that can jeopardize the structural safety of an existing building under moderate to strong seismic shaking. The high axial loads seem to compromise the deformation capacity of the SRC columns and result in limited ductility and significant post-peak strength degradation. Based on the observed test results, retrofitting SRC shear controlled columns with high axial loads seems inevitable in areas of strong seismicity.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket