Plastic Collapse and LBB Behavior of Statically Indeterminate Piping System under Static Load

摘要

The plastic collapse and LBB behavior of statically indeterminate piping system were investigated in this study, compared with statically determinate piping system. Special attention was paid to evaluate the crack opening displacement after a crack penetrated wall thickness. The main results obtained were as follows: (1) The reduction of ultimate strength caused by a crack was relatively small in the statically indeterminate piping system. The main reason is considered that a sufficient redistribution of the bending moment occurs in this system. (2) A method to evaluate the crack opening displacement in pipe was proposed. From this method, it was known that the crack opening displacement could be evaluated by using the plastic rotation angle.