Optimal selection of ground motion intensity measures for probabilistic seismic demand analysis of long-span bridge structures
Chen Liang1; Li jian-zhong2
1. School of civil engineering, Hefei university of technology, Hefei Anhui 230009; 2 Tongji University，National key Laboratory of Disaster Reduction in the civil engineering, Shanghai 200092
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.
2011, Vol. 30 
