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Seismic Performances of Underground RC Structures in Liquefiable Soils in Nuclear Plants
To ensure earthquake resistance capability of underground reinforced concrete (RC) box culvert structures in liquefiable soils in nuclear plants, appropriate seismic safety evaluation is of prime importance. Based on 30g centrifuge tests, seismic responses are investigated by effective stress analysis method. It is found that lateral displacements of soil layer and RC structure in earthquake input wave model increase with input waves and displacement at top slab of RC structure is smaller than that in the saturated ground at same depth. However, in sine input wave model the displacements in the case with frequency 0.8 Hz under 0.35g are larger than those of the case with frequency 1.2 Hz under 0.50g. Plastic yielding region of RC structure first occurs at top and bottom corners, reaches up to around the corner area. Dynamic earth pressures acting on sidewalls of RC structure increase gradually to values of total vertical stress in free field on average. Furthermore, comparison of seismic responses between centrifuge test and numerical modelling in the representative case of peak acceleration amplitude 0.85g is fairly good.
Seismic Performances of Underground RC Structures in Liquefiable Soils in Nuclear Plants
To ensure earthquake resistance capability of underground reinforced concrete (RC) box culvert structures in liquefiable soils in nuclear plants, appropriate seismic safety evaluation is of prime importance. Based on 30g centrifuge tests, seismic responses are investigated by effective stress analysis method. It is found that lateral displacements of soil layer and RC structure in earthquake input wave model increase with input waves and displacement at top slab of RC structure is smaller than that in the saturated ground at same depth. However, in sine input wave model the displacements in the case with frequency 0.8 Hz under 0.35g are larger than those of the case with frequency 1.2 Hz under 0.50g. Plastic yielding region of RC structure first occurs at top and bottom corners, reaches up to around the corner area. Dynamic earth pressures acting on sidewalls of RC structure increase gradually to values of total vertical stress in free field on average. Furthermore, comparison of seismic responses between centrifuge test and numerical modelling in the representative case of peak acceleration amplitude 0.85g is fairly good.
Seismic Performances of Underground RC Structures in Liquefiable Soils in Nuclear Plants
Wang, M. W. (author) / Iai, S. (author) / Tobita, T. (author)
GeoShanghai International Conference 2006 ; 2006 ; Shanghai, China
2006-05-11
Conference paper
Electronic Resource
English
Seismic Performances of Underground RC Structures in Liquefiable Soils in Nuclear Plants
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