Abstract
The three-dimensional response of buried steel pipes under vehicle loads is investigated using the finite element analysis. The analysis is conducted using the finite element program ABAQUS. The effects of the vehicle parameters, pipeline parameters and soil parameters on the response of the buried pipeline were discussed. The results indicate that the maximum principal stresses in a buried pipe under vehicle loads are significant for burial depths of less than 1 m. The maximum principal stresses of the buried pipeline decrease as the burial depth, vehicle velocity and surrounding soil’s elasticity modulus increase. For small burial depths, the stresses in buried pipes caused by vehicle motion in the direction normal to the pipe axis are more critical. However, the effects of motion direction are insignificant when the burial depth and the surrounding soil’s elasticity modulus increase. As the diameter of a buried pipe decreases, the maximum principal stresses increase.
Highlights
Gas pipeline system as one of the vital arteries due to passing through different areas is exposed to many local factors such as roads, railways, bridges, embankments, mechanical equipment, etc
The results indicate that the maximum principal stresses in a buried pipe under vehicle loads are significant for burial depths of less than 1 m
The results suggest that pipe stress decreases as soil-pipe relative hardness and burial depth decrease
Summary
Gas pipeline system as one of the vital arteries due to passing through different areas is exposed to many local factors such as roads, railways, bridges, embankments, mechanical equipment, etc. The studies on trench cavities generally suggest that the pressure caused by a concentrated surface load, e.g. that of a vehicle wheel weight, is very similar to the pressure distribution obtained from Boussinesq solution of a concentrated load on a semi-infinite medium [4] This may be illogical for pipes under shallow burial. Liu and Yang [14] used ABAQUS software package to model buried pipelines under impact force of falling objects They investigated the effects of relative hardness and burial depth on stress distribution of buried pipes. Noor [5] studied the three-dimensional finite element analysis of a buried concrete pipe under vehicle loads and showed that the soil-pipeline interaction should be considered for shallow buried pipeline. The results presented can be used as a reference for the safety evaluation of buried pipelines
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