Effects of strong ground motions of near source earthquakes on response of thin-walled L-shaped steel bridge piers

Guanmo Xie(China) , Takeo Taniguchi , Nawawi Chouw(Japan)

Abstract

Near source earthquakes can be characterized not only by strong horizontal but also bystrong vertical ground motions with broad range of dominant frequencies. The inelastic horizontalresponse of thin-walled L-shaped steel bridge piers, which are popularly used as highway bridge supports,subjected to simultaneous horizontal and vertical ground excitations of near source earthquakes isinvestigated. A comprehensive damage index and an evolutionary-degrading hysteretic model are applied.Numerical analysis reveals that the strong vertical excitation of a near source earthquake exertsconsiderable influences on the damage development and horizontal response of thin-walled L-shaped steelbridge piers.

Key Words

near source earthquakes; strong vertical ground motion; thin-walled steel bridge piers; inelastic response; damage index; evolutionary-degrading hysteretic model.

Address

Guanmo Xie, Department of Engineering Mechanics, Wuhan University of Technology, Wuhan 430070, ChinaTakeo Taniguchi and Nawawi Chouw, Department of Environmental and Civil Engineering, Okayama University, Okayama 700-8530, Japan

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