Abstract
New model has been proposed to analyze the leak before berak characteristics and plastic collapse behaviour of statically indeterminate pipe system with circumferetial crack quantatively and easily. The main results obtained are as follows. 1) By combining limit analysis theory and elasto-plastic fracture mechaics, the effects of crack size, compliance and fracture toughness on plastic collapse behavior and structural integrity of statically indeterminate pipe system have been analyzed quantatively. 2) The analysis method adopted in this paper is useful and conveninet to evaluate the LBB and plastic collapse behavior of a piping system.
