PURPOSE: To make possible more realistic and short-time analysis by modeling straight pipes and a curved pipe of a pipeline respectively by a cylinder shell model, and carrying out operation on respective physical quantities of the pipeline by a correction transmitting matrix into which disturbed data is considered after the disturbed data of the ground by an earthquake is inputted.
CONSTITUTION: One end of the first straight pipe 21 is installed in a structure 1, and the other end of this is installed on one end of a curved pipe 4 by the first joint 31. The other end of the curved pipe 4 is installed on one end of the second straight pipe 22 by the second joint 32, and the other end of this is made free. Behavior against an earthquake of a pipeline buried underground in this way is analyzed. In this case, in the first place, the straight pipes 21 and 22 and the curved pipe 4 are modeled respectively by a cylinder shell model. Next, disturbed data of the ground by the earthquake, for example, a spring constant of the ground or displacement of the earthquake and the like are inputted. In succession, by a correction transmitting matrix into which the disturbed data is considered, operation is carried out on respective physical quantities of the pipeline, for example, on pipe shaft directional stress, circumferential directional stress and circumferential directional shearing force and the like.
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NIIMI TATSUHIKO
KATAGIRI MAKOTO
TANIGAWA SHINICHI
KUBOTA KK