Date of Award
Master of Science (MS)
Two separate columns were studied for this thesis. The first column was a column designed and tested by Marriot (2009) this column had energy dissipating (ED) links (or dissipators) and four internal unbonded tendons which served as a self-centering mechanism for the rocking column. The second column was a column designed and tested by (Sideris, 2012). This column did not include ED links and had eight internal unbonded tendons that served as a self-centering mechanism for the rocking column. The column by Sideris also included sliding at the segmental joints, which was not considered herein, as this thesis focuses solely on rocking columns. Two analytical models were created for each column with two modeling approaches for the contact interface (at the rocking joint), calibrated through parametric studies in this thesis. Parametric studies were also performed for design parameters to investigate their effect on the overall response of the columns.
The column by (Sideris, 2012) was further subjected to an Incremental Dynamic Analysis (IDA). The far-field record set from FEMA-P695 was used and scaled to the model/experimental domain through similitude analysis, since the column was not the prototype structure. The IDA looked at the effect of assuming that tendons fracture at a strain of 7.00% (typical design assumption), compared to experimental data gathered, which concluded that the individual wires start to fracture at 2.41% (Sideris, Aref, & Filiatrault, 2014) Damage measures (DMs) were recorded for each IDA and the probability of them exceeding specified limit states (LSs, threshold values representing damage states) under given seismic intensity, represented by a selected intensity measure (IM), was calculated. With this data, fragility curves were produced to compare the responses of the two separate IDA’s.
Bowman, Brandon William, "Modeling of Post-Tensioned Rocking Bridge Columns" (2016). Civil Engineering Graduate Theses & Dissertations. 424.