Simulation method of random ground motion for large-span bridge in service

ZHAO Jun; NIU Di-tao

doi:10.19818/j.cnki.1671-1637.2013.01.005

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ZHAO Jun, NIU Di-tao. Simulation method of random ground motion for large-span bridge in service[J]. Journal of Traffic and Transportation Engineering, 2013, 13(1): 27-35. doi: 10.19818/j.cnki.1671-1637.2013.01.005

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ZHAO Jun, NIU Di-tao. Simulation method of random ground motion for large-span bridge in service[J]. Journal of Traffic and Transportation Engineering, 2013, 13(1): 27-35. doi: 10.19818/j.cnki.1671-1637.2013.01.005

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Simulation method of random ground motion for large-span bridge in service

doi: 10.19818/j.cnki.1671-1637.2013.01.005

ZHAO Jun^{1, 2},
NIU Di-tao¹

1.
School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China
2.
School of Science, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China

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Author Bio:
ZHAO Jun(1980-), female, lecturer, doctoral student, +86-29-82201416, tongfeibridge@126.com

NIU Di-tao(1963-), male, professor, PhD, +86-29-82205985, niuditao@163.com
Received Date: 2012-11-18
Publish Date: 2013-02-25

Abstract

Abstract

Considering the influence of bridge structure service period on earthquake loading, equal exceeding probability method was applied to reduce earthquake role, and two fortification criterions of current anti-seismic code for highway bridge were supplemented to three levels. The probability theory was used to randomize target response spectrum by considering the randomness of ground motion. Combined with coherence function and phase difference spectrum theory, the non-stationary random ground motions of spatial correlation multi-points for existing bridge structure were generated by using MATLAB programming. Simulation result indicates that ground motion peak acceleration can be reduced rationally by using equal exceeding probability method. Probability theory can be used to get random response spectrum, which can well simulate the randomness of ground motion, and the variation coefficient maximum difference value of thirty random response spectrums is 0. 064, it meets accuracy requirement. The calculating response spectrums fit well to random target response spectrums, the goodnesses of fit for points No. 1 and No. 2 are 0.82 and 0.81 respectively, they meet accuracy requirement. The artificial ground motions can reflect the service period of existing bridge structure and therandomness of ground motion, and are similar to actual earthquake records. 7 tabs, 12 figs, 23 refs.
- bridge engineering,
- random ground motion,
- equal exceeding probability,
- probability theory,
- coherence function,
- phase difference spectrum

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References

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Simulation method of random ground motion for large-span bridge in service

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