鉄筋コンクリート造原子炉建家の地震時挙動に関する構造実験とその解析 : (その 2) 地震応答解析

抄録

Dynamic behaviors of a reactor building when subjected to severe earthquakes were analyzed and discussed in the light of experimental facts. A model reactor building for dynamic analyses had all the same structural features as the tested specimen except that it was 25 times size and had additional steel framing at the top floor portion. Weights located on every floor were decided so as to correspond to actual loads. A vibration model was idealized to have lumped masses which were interconnected by flexural and shearing elements to each other. Strength deformation characteristics of elements were already formulated by a proposal in the previous part of the paper. Then, nonlinear dynamic responses of the model to the input ground motions were computed using step direct integration method. The results of responses to strong earthquakes with maximum acceleration up to 600 gals were summarized as follows : 1. Due to the strong ground motion, a model structure always entered into nonlinear ranges. For instance, flexural and shearing yield specified by the test results occurred against earthquakes with maximum acceleration of 400 gals or more. 2. Structural damages estimated by the test results were, however, very minor even against the worst earthquake with 600 gals. Comparing the ultimate strength and the largest deformability with those of response values, it was concluded that the safety factors of the model structure were satisfactorily assured.