Xie, Tianyou (2017) Force Modification Factors for the Seismic Design of Bridges. Masters thesis, Concordia University.
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Abstract
The current seismic design of bridges is based on a well-known principle, i.e., capacity design, in which the superstructure should remain elastic during earthquake events while the nonlinear deformation (i.e., plastic hinges) should occur in the substructure and should be ductile in term of flexure. Given this, the Canadian Highway Bridge Design Code (CHBDC) allows reducing the demands for the design of substructure elements (mainly columns) by a response modification factor R. Since the R-factor will affect the design forces significantly, the objective of the study is to determine its value from detailed finite element analyses, and evaluate its dependency on the ductility and bridge dominant period. For the purpose of the study, eight existing typical highway bridges in Montreal are examined including slab type bridges, slab-girder type bridges, and box-girder bridges. The substructure of the bridges consists of multiple columns from two to four. Nonlinear time-history analyses are conducted on each bridge model using IDARC. Thirty simulated accelerograms are used as input for the seismic excitations, and they are scaled to three intensity levels based on the first mode period of the bridge, namely, 1.0Sa(T1), 2.0Sa(T1), and 3.0Sa(T1). It is found in the study that the configuration of the substructure affects the R-factor, such as, number of columns in the bent, using of crush struts, type of the bearings, etc. In addition, neither the equal displacement rule nor equal energy rule is observed in this study.
Divisions: | Concordia University > Gina Cody School of Engineering and Computer Science > Building, Civil and Environmental Engineering |
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Item Type: | Thesis (Masters) |
Authors: | Xie, Tianyou |
Institution: | Concordia University |
Degree Name: | M.A. Sc. |
Program: | Civil Engineering |
Date: | 16 August 2017 |
Thesis Supervisor(s): | Lin, Lan |
Keywords: | Force modification factor, Bridges, Seismic design |
ID Code: | 982770 |
Deposited By: | TIANYOU XIE |
Deposited On: | 10 Nov 2017 14:53 |
Last Modified: | 18 Jan 2018 17:55 |
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