Analysis of elastoplastic seismic response of high-speed railway bridge with round-ended piers

作者：Chen Ling Kun^*; Jiang Li Zhong; Wang Li Ping; Luo Bo Fu

来源：Journal of South China University of Technology(Natural Science Edition), 2011, 39(6): 126-131.

DOI：10.3969/j.issn.1000-565X.2011.06.022

• Different speed
• Earthquake acceleration
• Earthquake load
• Elasto-plastic
• Elasto-plastic analysis
• Finite element software
• High-speed railways
• Moment-curvature relationship
• Multi-spans
• Natural vibration
• Non-linear beams
• Plastic hinge region
• Plastic hinges
• Round-ended pier
• Seismic action
• Strong motion records
• Train loads
• Train speed

As the high-speed railway is developing rapidly both in China and abroad at present, it is necessary to deeply analyze the dynamic responses of high-speed railway bridges under seismic action. In this paper, a whole-bridge model of a multi-span simply-supported high-speed railway bridge with round-ended piers is set up with the finite element software, and the natural vibration properties of the structure are analyzed. Then, different speeds, strong motion records, pier heights, earthquake accelerations and earthquake load combinations in various directions are respectively input to calculate the elastic seismic responses of the bridge. Finally, by applying the moment-curvature relationship to the nonlinear beam element, the elastoplastic seismic responses of the round-ended piers with and without train loads are calculated. The results show that, under the designed earthquake, the bridge is in the elastic stage and the seismic responses increase with the train speed and pier height, while under severe earthquakes, the pier bottom steps into the elastoplastic stage, the impact of train loads on the seismic responses of the round-ended piers is relatively slight, and plastic hinges occur at the pier bottom, so that some countermeasures should be taken to ensure the security of the plastic hinge region.

• 出版日期2011
• 单位中南大学