Elasto-plastic response spectra for beam bridge seismic design

LI Yu,WANG Sen,CHE Yan-yang,WU Fang-wen

Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (10) : 1-5.

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (10) : 1-5.

Elasto-plastic response spectra for beam bridge seismic design

  • LI Yu,WANG Sen,CHE Yan-yang,WU Fang-wen
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Abstract

320 Strong motion records of four sites are appropriately selected. The elasto-plastic dynamic analysis program is used to research the effects of characteristics of earthquake motion and dynamic parameters of restoring model on elasto-plastic displacement spectra and residual displacement spectra. The study results are obtained as follow: 1) Elasto-plastic response spectra of other protected earthquake intensity can be obtained by adjusting elasto-plastic response spectra of the standard protected earthquake intensity according to the ratio of PGA (protected earthquake intensity) to PGA (standard protected earthquake). 2) Effects of yielding rigidity ratio on elasto-plastic displacement spectra can be neglected. But conservative yielding rigidity ratio is chosen to establish residual displacement spectra which can be applied in low and medium-height piers of general regular bridge with short natural period and low ductility. 4) Elasto-plastic displacement spectra and residual displacement spectra are affected obviously by both damping ratio and ductility. And, the elasto-plastic displacement and residual displacement can be decreased by increasing damping ratio. Based on conclusions above, elasto-plastic displacement spectra and residual displacement spectra, which is applicable in seismic design for Chinese bridge, are established. So, some meaningful references are provided for performance-based seismic design for bridge considering residual displacement.

Key words

elasto-plastic response spectra / seismic design / PGA / yielding rigidity / ductility

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LI Yu,WANG Sen,CHE Yan-yang,WU Fang-wen. Elasto-plastic response spectra for beam bridge seismic design[J]. Journal of Vibration and Shock, 2015, 34(10): 1-5

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