UBC Theses and Dissertations
The Shaking Table Tests Column Database and evaluation of drift capacity models for non-ductile columns Li, Yaqiong
A Shaking Table Tests Column Database comprised of 59 reinforced concrete columns subjected to shaking table tests is compiled in this research. Key geometrical information, material properties and test data of the columns are provided and used to improve the seismic assessment of old reinforced concrete structures. Several structural models estimating the column effective stiffness and drift capacities at shear failure and axial-load failure are evaluated. Models based on the design parameters, such as transverse reinforcement ratio and axial load ratio, generally underestimate the column drift at shear failure (loss of 20% of lateral resistant force) in the dynamic test. Empirical plastic drift capacity models for columns subjected to subduction earthquakes and general types of ground motions are proposed. For column drift at axial-load failure, models based on shear-friction mechanism could capture the drift capacity fairly well. The provisions of the current seismic rehabilitation standard ASCE/SEI 41 Supplement 1 regarding the concrete columns are also evaluated with this dynamic database. It is found that this standard generally overestimates the column effective stiffness and could provide the mean value of the column shear strength. The modeling parameters specified in the standard provide fairly conservative estimate of the column drift capacities and are consistent with the targeted probability of failure. Refinements of the shear strength model and the criteria for column classifications are suggested in this research.
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