| 英文摘要 |
In a previous experimental study for the flanged joint of a RHR piping system in a NPP, leakage occurred at the tested flanged joint, due to its loosened bolts while the joint was subjecting to pure-bending loading. To clarify the cause of this phenomenon, this study aims to investigating the effect of the deformation of the flange gasket on the decrease in the pre-stress of the bolts. In the first part of this study, a series of compression loading tests for components of the flange gasket is executed in order to understand in detail the behavior of the flange gasket with pre-stressed bolts. Next, according to the deformation ehavior of the gasket obtained from tests, the flanged joint is modelled using the ABAQUS commercial code. Finally, shaking table tests for a part of the RHR piping system with the flanged joint are executed to verify the accuracy of the corresponding numerical model under dynamic loading. The applicability of ASME’s Boiler and Pressure Vessel Code to evaluating of this type of flanged joints is discussed as well. |
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