Ida-Based Research on Displacement Ductility and Seismic Fragility of Continuous Girder Bridge in High-Speed Rail


Abstract eng:
Comparatively huge dimensions of the cross-sections of the girder and pier of the bridges in high-speed rail were applied to cater for demand of the railway smoothness and the passengers comfort. Whether the seismic performance of the girder bridges satisfied the target performance of the three level seismic fortification targets coded in the existing Code for seismic design of railway engineering (GB50111-2006) (2009 version), is an extensively concerned question in the engineering field. A typical three span continuous girder bridge as the case bridge, the different finite element models are constructed for the different pier height and bridge arrangements using Opensees software. The incremental dynamic analysis (IDA) method is used to analyze the longitudinal seismic performance of the bridges above mentioned. It is shown that pier height and bridge arrangements have little influence on the displacement ductility coefficients for the moderate damage limit state, ranging as 2.31 to 2.38, meanwhile for the severe damage limit state, the displacement ductility coefficients can be close to 7.84 ~ 8.25, those are significantly greater than the allowable ductility coefficient of 4.8. Within the pier height range of 10 to 20m, the height of the fixed pier is the fundamental factor which affects the seismic performance of the pier; while the bridge arrangements with different pier heights are the slight factor. During the design reference period, the bridge piers in high-speed rail will be substantially slight and moderate damaged with high probability; the severe damage probability is about 30%; and the occurring probability of the complete damage (collapse) is as small as being neglected.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 3670.:
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