A Modal Pushover Analysis for Estimating Seismic Demands of Steel Post-tensioned Self-centering Frames
Date Issued
2010
Date
2010
Author(s)
Chen, Jun-Ming
Abstract
This research is investigating the modal pushover analysis (MPA) for estimating seismic demands of 3, 6, and 12-story steel post-tensioned self-centering frames. First, comparing the behavior of RS model and AS model under the ground motion. There has a large error in 12-story frame at the lower floor (75%) on displacement and interstroy drift, but has good estimation of 3 and 6-story frame (10%) on displacement and interstory drift. In strand force increment, at the 12-story frame lower floor has infinite error. The reason is when the AS model has no strand force increment (0 kN) but RS model has, then at this situation the error is infinite. The column restraining force also has large error, because the AS and RS model have different calculation on column restraining force. But the error is not especially significant for the beam axial force, because the column restraining force is small of the large error floor. Even though the strand force incerement and column restraining force has large error, but this large error is small force the beam axial force, the largest error is only 23% at the 12-story frame lower floor.
Neglecting the inherent error between the two models, then using the MPA on the PT-frame. At displacement (3 and 6-story frame has 5% error, 12-story frame has 10% error) and interstory drift (3 and 6-story frame has 10% error, 12-story frame has 20% error). Althogh the strand force increment (3-story frame has 40% error, 6-story frame has 30% error, 12-story frame has 65% error ) and the column restraining force has large error, but this error for the beam axial force is small (3, 6-story frame has 10% error, 12-story frame has 20% error).
Subjects
modal pushover analysis
post-tensioned frame
column restraining force
self-centering
flag shape hysteresis
Type
thesis
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