| dc.description.abstract | ABSTRACT
Lately, modern bridge seismic design has been developed toward the seismic performance design on whole bridges as well as their elements. Based on the traditional dynamic analysis, it is difficult to predict the performance of the components of bridges, such as bearing, unseating prevention devices, and columns.
The Vector Form Intrinsic Finite Element (VFIFE) is superior in managing the engineering problems with material nonlinearity, discontinuity, large deformation, large displacement and arbitrary rigid body motions of deformable bodies. The VFIFE is thus selected to be the 3-D analysis method in this study. It is easily to predict the nonlinear behavior of bridges subjected to extreme earthquakes, such as impact between girders, plastic hinge, unseating of decks, fracture of unseating prevention devices, and collapse situation.
In order to analyze the real condition of the section, this study is aimed to develop the new model of Fiber Element that using stress-strain relation in plastic hinge zone to simulate high-degree nonlinear behavior of bridges by strong motion. Implicit time integration method (Newmark-β) is adopted to renew the iteration type of Fiber Element Method to calculate the element internal force. Finally, this study analyzes a three-span-continuous isolated bridge to investigate the extreme functions of the columns and unseating prevention devices between Fiber Element and Bilinear Spring, and predict the collapse situation of the target bridge. | en_US |