Dynamic response and limit analysis of buried high-pressure gas pipeline under blasting load based on the Hamilton principle

摘要: For non-conservative systems consisting of elastic-plastic material, dissipative damping a system in dynamic environment involves two parts: (1) the energy related to velocity mass point and (2) associated with strain rate. In this paper, response buried high-pressure gas pipeline under blasting load is studied, where, dissipation explicitly considered. The work was introduced into Lagrange function. According Hamilton principle finite element theory, explosion model composed elastic plastic materials established identify propagation characteristics detonation wave earth medium, where cavity triangle pressure time history on internal wall used describe explosive stress from pipeline. scheme modeling, 15 cases different payloads, distances center thicknesses pipe were regarded as generalized carried out. Then specific responses shown post processing, well relationship between peak particle vibration distance payload. Using three types limit analysis methods, critical loading, thickness loading determined. computational method results paper could be referenced for security operation construction scheme.