Optimal selection of ground motion intensity measures for probabilistic seismic demand analysis of long-span bridge structures

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (10) : 91-97.

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Optimal selection of ground motion intensity measures for probabilistic seismic demand analysis of long-span bridge structures

Chen Liang1; Li jian-zhong2

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Abstract

Intensity measures (IM) should be reasonably selected on the basis of earthquake engineering and earthquake resistance of structures for seismic design and analysis of long-span bridges. The nonlinear dynamic time-history analysis was conducted for a long-span highway cable-stayed bridge with two towers. It is concluded that the influence of frequency content in the range of period with predominant cumulative modal mass participation on structural seismic demands is significant because of obvious higher mode effects in different directions of long-span bridges. The effects of spectra in the high-frequency domain on structural seismic demands are more than in the low-frequency domain. In general, PGA and short-period spectra accelerations are applicable to be as IMs to conduct dynamic time-history analysis.

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earthquake resistance of bridges / long-span bridge structure / intensity measure / optimal selection / probabilistic seismic demand analysis

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Chen Liang;Li jian-zhong. Optimal selection of ground motion intensity measures for probabilistic seismic demand analysis of long-span bridge structures [J]. Journal of Vibration and Shock, 2011, 30(10): 91-97