Title:
Life-Safety and Near-Collapse Capacity Models for Seismic Shear Behavior of Reinforced Concrete Columns
Author(s):
Mehrdad Sasani
Publication:
Structural Journal
Volume:
104
Issue:
1
Appears on pages(s):
30-38
Keywords:
column; deformation; failure; shear strength; strength
DOI:
10.14359/18430
Date:
1/1/2007
Abstract:
The capacity of reinforced concrete (RC) columns subjected to seismic actions and susceptible to shear failure can be expressed in terms of deformation and strength. In this paper, using experimental test results of columns and the mechanics of deformation of columns and incorporating the Bayesian parameter estimation technique, probabilistic deformation capacity models for life-safety, and near-collapse performance levels are developed. The models account for the difference between the deformation of double-curvature and double-ended columns, in which damage can concentrate on one end of the specimen, and that of cantilever columns. The models include the effects of the transverse reinforcement, axial load, and the aspect ratio of columns on their deformation capacities. Using shear force transfer mechanics, a shear strength capacity model is also developed for RC columns. In addition to the section and material characteristics, the shear strength capacity model accounts for the effects of the aspect ratio (shear span divided by the depth of section), compressive load, and displacement ductility on the column strength. It is shown that, compared with available models in current codes and standards, the proposed model predicts the shear strength of columns more reliably.