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Model to Assess the Seismic Response of Shear-Critical Rectangular Columns
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DOI：10.1061/JSENDH.STENG-13878.png)
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Abstract
En 中文
This paper describes a complete shear force-lateral displacement model for predicting the response envelope of shear-critical rectangular columns comprising (1) an effective stiffness, (2) nominal shear strength, and (3) softening, including the loss of gravity load-carrying capacity. The effective stiffness of shear-critical columns was found to correlate well with a simplified equation from the literature for the effective stiffness of flexural-dominated columns. In the model, the shear strength is estimated based on the classical approach of the sum of two independent mechanisms of shear resistance, which uses a new definition for computing the section's effective depth. Softening in the response was defined in two parts. The first part that occurs at the onset of softening was correlated to a single-dimensional parameter, making this portion of the degrading response dependent on the column size. The second part was conservatively made a sole function of the column's longitudinal reinforcement, which can either reach plastic buckling or form a local sidesway mechanism.
Keywords:
Effective lateral stiffness
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Rectangular reinforced concrete columns
Shear-critical columns
Shear strength
Softening response
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