Investigation on Rational Analytical Model of Tall Bridge Pier

Abstract eng:
Two analytical models for a tall pier and a low pier are developed based on the elastic-plastic beam-column element and the elastic-plastic fiber beam-column element. Structural seismic demands such as the rotation of the plastic hinge, the development of the plastic zone, and the displacement at the top of a pier are investigated. The effect of the division density of the elastic-plastic beam-column element on seismic demand is investigated and compared. The results show that seismic demands of a tall pier are different from those of a lower pier due to the higher vibration modes contribution. For a tall pier, the multiple plastic hinges occur at the middle and the bottom of the pier and develop with the increase of the seismic intensity. Furthermore, different element division densities have a significant effect on the plastic rotation demand if multiple plastic hinges appears.

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