Experimental and Numerical Investigation of Buried Pipeline Due to Axial Vibration

Abstract eng:
Literature shows that axial behavior of buried pipeline due to vibration or dynamic loading is an important factor for design procedure. Recently, many researchers are focused to improve design criteria for this type of structure in different geotechnical conditions and construction methods. Static and dynamic stiffness, damping coefficient, mass association of surrounding pipe material in many cases characterized the dynamic loading system in analytical model of buried pipelines. Therefore, in this paper an analytical model based on the laboratory testing method is presented to investigation some important factors which effects on buried pipeline structure. Based on the statistical interpretation for the laboratory testing results the actual data is applied to the presented model for understanding the sensitivity of the parameters which involves in pipeline structures. The concept of analytical model is based on the dynamic structures and mechanical vibration theory with using the Fourier transfer in time and frequency domain. The Winkler spring is also applied to provide facility for considering the linear and nonlinear behavior of surrounding material in the model of buried pipeline. The available loading and measurement equipments such as Loadcell, Actuator, and Computer network are applied with Servo-Hydraulic system in the laboratory investigation. In the laboratory work, the pipeline with a suitable scale is simulated with a box which the pipe is laid between the several compact layers of nominated soil. The reflection of the dynamic wave in the both end- boundaries of pipe was controlled through several plates which submerged in viscous fluid. The sensitivity of soil material parameters , depth of buried pipe, pipe diameter, pipe material , soil water content, soil compaction factor, amplitude and frequency of harmonic vibration and etc., are investigate in this research work. The study shows that: Stiffness between pipe and surrounding material in dynamic condition is less than static. Force-displacement relationship between pipe and soil in axial direction of pipe is nonlinear. Investigation shows that increasing the frequency of harmonic vibration decreases amplitude of axial force and dynamic stiffness between pipe and surrounding material.

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