TY - JOUR
T1 - Large strain nonlinear model of lead rubber bearings for beyond design basis earthquakes
AU - Eem, Seunghyun
AU - Hahm, Daegi
N1 - Publisher Copyright:
© 2018
PY - 2019/4
Y1 - 2019/4
N2 - Studies on the application of the lead rubber bearing (LRB) isolation system to nuclear power plants are being carried out as one of the measures to improve seismic performance. Nuclear power plants with isolation systems require seismic probabilistic safety assessments, for which the seismic fragility of the structures, systems, and components needs be calculated, including for beyond design basis earthquakes. To this end, seismic response analyses are required, where it can be seen that the behaviors of the isolation system components govern the overall seismic response of an isolated plant. The numerical model of the LRB used in these seismic response analyses plays an important role, but in most cases, the extreme performance of the LRB has not been well studied. The current work therefore develops an extreme nonlinear numerical model that can express the seismic response of the LRB for beyond design basis earthquakes. A full-scale LRB was fabricated and dynamically tested with various input conditions, and test results confirmed that the developed numerical model better represents the behavior of the LRB over previous models. Subsequent seismic response analyses of isolated nuclear power plants using the model developed here are expected to provide more accurate results for seismic probabilistic safety assessments.
AB - Studies on the application of the lead rubber bearing (LRB) isolation system to nuclear power plants are being carried out as one of the measures to improve seismic performance. Nuclear power plants with isolation systems require seismic probabilistic safety assessments, for which the seismic fragility of the structures, systems, and components needs be calculated, including for beyond design basis earthquakes. To this end, seismic response analyses are required, where it can be seen that the behaviors of the isolation system components govern the overall seismic response of an isolated plant. The numerical model of the LRB used in these seismic response analyses plays an important role, but in most cases, the extreme performance of the LRB has not been well studied. The current work therefore develops an extreme nonlinear numerical model that can express the seismic response of the LRB for beyond design basis earthquakes. A full-scale LRB was fabricated and dynamically tested with various input conditions, and test results confirmed that the developed numerical model better represents the behavior of the LRB over previous models. Subsequent seismic response analyses of isolated nuclear power plants using the model developed here are expected to provide more accurate results for seismic probabilistic safety assessments.
KW - Isolation system
KW - Lead rubber bearing
KW - Nonlinear numerical model
KW - Nuclear power plants
KW - Seismic isolation
KW - Seismic response analysis
UR - http://www.scopus.com/inward/record.url?scp=85062709737&partnerID=8YFLogxK
U2 - 10.1016/j.net.2018.11.001
DO - 10.1016/j.net.2018.11.001
M3 - Article
AN - SCOPUS:85062709737
SN - 1738-5733
VL - 51
SP - 600
EP - 606
JO - Nuclear Engineering and Technology
JF - Nuclear Engineering and Technology
IS - 2
ER -