The Analysis of Multi-point Earthquake Inputs for Long Span Aqueduct Considering Topographic Effects
The long-span aqueducts built in earthquake-prone hilly areas often span irregular ridges and valleys. Therefore, two adjacent asymmetric ridges are depicted as the finite element analysis model.Using transmission boundary and explicit finite element method, the seismic responses of the ground surface excited by P and SV waves with different incidence angles have been analyzed. The analysis method considers the synthetic effects of wave propagation and topography. Results show that the ground motions have been amplified obviously on the ridges, while de-amplified in the valley. Besides,the differential motions especially in the upper parts of the ridges are significant. If such seismic excitations are applied to the aqueduct, the dynamic responses of the structure can be much greater than that of considering the traveling-wave effects only. Therefore, not considering the topographic effects will underestimate the damage of the structure and lead to non-conservative seismic design. The conclusions can serve as the seismic design reference for determining the reasonable seismic inputs of the long-span aqueduct.
Traveling-wave effects Topographic effects Aqueduct Seismic response
WANG Lei ZHAO Chenggang
Department of Civil Engineering,Beijing Jiao-tong University,Beijing,P.R.China,100044;College of Urb Department of Civil Engineering,Beijing Jiao-tong University,Beijing,P.R.China,100044
国际会议
2007 International Conference on Agriculture Engineering(2007年农业工程国际会议)
河北保定
英文
922-927
2007-10-20（万方平台首次上网日期，不代表论文的发表时间）