Investigation on method of elasto-plastic analysis for piping system. No.1

This report proposes an elasto-plastic analysis method to be used for practical aseismic designing of nuclear piping system made of carbon steel. This elasto-plastic analysis method is based on the elasto-plastic analysis method which has been decided by JSME. By using this analysis method, the test result has been reproduced with sufficient accuracy for the strain range used as the intensity evaluation index of carbon steel piping. Furthermore, fatigue life has also been reproduced with sufficient accuracy by using the curve of fatigue of carbon steel piping upon which it decided in a cooperative study among electric power companies and manufacturers in Japan. It seems that this analysis technology is applicable also to the preservation after an earthquake since this elasto-plastic analysis method can grasp the elasto-plastic behavior of carbon steel piping analytically. (author)