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Structural Engineering and Mechanics
  Volume 12, Number 3, September 2001 , pages 341-346

Effects of strong ground motions of near source earthquakes on response of thin-walled L-shaped steel bridge piers
Guanmo Xie(China), Takeo Taniguchi and Nawawi Chouw(Japan)

    Near source earthquakes can be characterized not only by strong horizontal but also by
strong vertical ground motions with broad range of dominant frequencies. The inelastic horizontal
response 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 is
investigated. 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 exerts
considerable influences on the damage development and horizontal response of thin-walled L-shaped steel
bridge piers.
Key Words
    near source earthquakes; strong vertical ground motion; thin-walled steel bridge piers; inelastic response; damage index; evolutionary-degrading hysteretic model.
Guanmo Xie, Department of Engineering Mechanics, Wuhan University of Technology, Wuhan 430070, China
Takeo Taniguchi and Nawawi Chouw, Department of Environmental and Civil Engineering, Okayama University, Okayama 700-8530, Japan

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