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Elastic-plastic Seismic Response Analysis of Hollow Thin-walled High-pier Large-span T-Shaped Rigid Frame Bridge under High-Level Earthquake Conditions

LI Lin(Lanzhou Railway Survey and Design Institute Co.Ltd.,Lanzhou 730000,China)  
By using structure analysis software,a finite element model of a hollow thin-walled high-pier and large-span T-shape rigid frame bridge is built for seismic analysis.The elastic-plastic seismic response is calculated by using the nonlinear dynamic time-history response method for high-level earthquakes in high-intensity seismic regions.The results are compared by using the linear time-history and response-spectrum methods.The seismic ductility performance of the hollow thin-walled high-pier structure is also analyzed and evaluated.It is concluded that the hollow high-pier thin-walled T-shaped rigid frame railway bridge is in weak nonlinear state under high-level earthquake conditions;however,the damage is small,as it has good seismic-resistant capability.Compared with the elastic seismic response,the seismic forces experienced by the structure are significantly reduced in the nonlinear plastic response.
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