Seismic Response Analysis of Nuclear Island Buildings in LNNP Unit 1

摘要

The paper studies the seismic response characteristics of nuclear island buildings in Leningrad Nuclear PowerrnPlant unit 1. The excitation in the free field is assumed to be seismic ground motion and will be defined by thernacceleration response spectrum described in the reference [1]. The spectral shape to be used to define this motionrncorresponds to a median (50 percentile) spectrum developed for soil sites. For the Leningrad plant, the horizontalrnpeak ground acceleration will be assumed equal to 0.1g. The vertical spectrum will be assumed equal to 2/3 of thernhorizontal spectrum. In order to form the analysis model used in the seismic response calculation of the seismicrnresponse of the nuclear island buildings of LNNP unit one the finite element model for reactor building has beenrnmerged with electrical building and turbine building models to form the joint structural model for nuclear islandrnbuildings. The floor response spectra for the seven floor elevations of the nuclear island buildings are developed. Thernspatial location of the response spectra generation in the plane of the floors was the shear center of the respective floorrnslab. The spectra were generated in three directions for x-, y-, and z-directions and for the damping ratios of 0.5%,rn2%, 5%, 7% and 15.