Response Characteristics of Operating Floor of Reactor Building in Onagawa Nuclear Power Plant Unit2 During Tohoku Earthquake 2011


Abstract eng:
The accelerometers recorded a maximum of 607 Gal and 1755 Gal on the basemat slab and roof slabs of the reactor building of Unit 2 of the Onagawa Nuclear Power Plant during the 2011 Tohoku Earthquake. In our previous paper [1], we confirmed the stiffness of the upper part of the operating floor was evidently degraded even though the reactor building maintained its structural integrity during the earthquake based on simulation analysis using lumped mass models. In this paper, we perform additional simulation analysis by 3D-FEM in order to understand the behavior of the reactor building focusing on the material nonlinearity of the upper part of the shear walls during the earthquake. The initial stiffness of walls before the earthquake and the nonlinear material properties of concrete are calibrated with the seismic records and the simulation model. The characteristics of the actual response of the operating floor were fully captured by the FEM model and as a result of the simulation the model numerically confirmed that the maximum strain values of the reinforcing bars were much smaller than the seismic capacity of shear walls during the earthquake.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 2668.:
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