Analytical Lateral Load Response of Unbonded PT CIP Special Structural Walls

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ANALYTICAL LATERAL LOAD RESPONSE OF UNBONDED POSTTENSIONED CIP SPECIAL STRUCTURAL WALLS WITH BONDED OR DEBONDED LONGITUDINAL MILD STEEL REINFORCEMENT

Author: Sonam Srivastava | Size: 4.8 MB | Format: PDF | Quality: Unspecified | Publisher: Sonam Srivastava | Year: 2013 | pages: 258

This research investigates the analytical lateral load responses of unbonded posttensioned
cast-in-place concrete special structural walls with bonded or debonded
longitudinal mild steel reinforcement under the action of monotonic lateral load. Two sets
of generalized closed-form expressions are derived for estimating the lateral load
responses, base moment and lateral drift, of the walls for critical limit states. First set of
equations is for cast-in-place special structural walls with bonded longitudinal
reinforcement and the second for cast-in-place special structural walls with
predetermined length of debonded longitudinal reinforcement at the base of the wall.
Analytical models for walls, with the two configurations of longitudinal reinforcement,
using fiber elements are also presented for nonlinear analysis of walls under monotonic
lateral load. In general, results of the closed-form expressions are in good agreement with
the results of analytical models.
The analytical models and the closed-form expressions are also used for investigating
effects of six design parameters in the lateral load response of the walls. The parameters
considered are area of post-tensioning steel with constant initial prestress; initial prestress
in post-tensioning steel with constant area of post-tensioning steel; constant initial
prestress force with varying area and initial prestress; area of boundary longitudinal
reinforcement; area of web longitudinal reinforcement; and spacing of web longitudinal
reinforcement.

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