Abstract
A novel self-centering prestressed concrete (SCPC) beam-column connection with web friction devices has been recently proposed for moment-resisting concrete frames. This paper presents the fragility analysis results of a SC concrete frame and a conventional reinforce concrete (RC) frame at various performance levels. Three performance limit states (i.e., Immediate Occupancy, Life Safety and Collapse Prevention limit states) are defined based on the peak story drift ratio and two other performance limit states (i.e., Re-centering and Repairable limit states) are defined based on the residual story drift ratio. Statistical analyses of the seismic demands reveal that the SC frame reduces the softening and dispersion of the residual story drift behavior. Fragility curves indicate that the SC frame experiences much smaller residual deformations and shows considerable reduction in the median fragility and probability of exceedance for the residual drift-related performance levels, as compared with the conventional RC frame.
Highlights
Recent seismic events have highlighted the limitations of the current building code provisions, in which the conventional reinforced concrete (RC) moment-resisting frames (MRFs) are expected to sustain significant residual deformations and structural damage after strong earthquakes
To assess the possible benefits of reduced residual deformations of the SC frame, two performance levels associated with the residual story drift ratio are used, i.e., “Re-centering” and “Repairable” performance levels, with corresponding maximum allowable residual story drifts of 0.2% and 0.5%, according to the study in Song et al [9]
Incremental dynamic analysis has been performed to estimate the seismic demands using a suite of selected earthquake records
Summary
Recent seismic events have highlighted the limitations of the current building code provisions, in which the conventional reinforced concrete (RC) moment-resisting frames (MRFs) are expected to sustain significant residual deformations and structural damage after strong earthquakes. The behavior of an SCPC frame is characterized by the gap opening/closing at the beam- column interfaces. An SCPC frame with WFDs uses unbonded post-tensioned (PT) tendons to compress the precast beam and column together, and to provide an elastic restoring force that returns the frame to its initial position (i.e. the frame is “self-centering”) after earthquakes. A conceptual connection moment-relative rotation (M-θr) behavior is shown, The beam-column interface is in complete contact until the applied external moment exceeds the imminent gap-opening moment. Two demonstration concrete frames (i.e. the conventional RC frame and the SCPC frame) are designed and analyzed by performing the seismic fragility analyses so as to provide a quantitative comparison of the probabilistic performance of the two frame systems
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