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http://dx.doi.org/10.14481/jkges.2015.16.9.43

Effect of Incident Direction of Earthquake Motion on Seismic Response of Buried Pipeline  

Kwak, Hyungjoo (Department of Civil and Environmental Engineering, Hanyang University)
Park, Duhee (Department of Civil and Environmental Engineering, Hanyang University)
Lee, Jangguen (Korea Institute of Construction Technology)
Kang, Jaemo (Korea Institute of Construction Technology)
Publication Information
Journal of the Korean GEO-environmental Society / v.16, no.9, 2015 , pp. 43-51 More about this Journal
Abstract
In this paper, a 3D shell-spring model that can perform time history analysis of buried pipelines is used to evaluate the effect of the incident direction of the earthquake motion. When applying harmonic motions, it is shown that the period of vibration has pronounced influence on the response of buried pipelines. With decrease in the period, the curvature of the pipeline and corresponding response are shown to increase. To evaluate the effect of the incident angle, the motions are applied in the direction of the pipleline, horizontal, and vertical planes. When the motion is applied parallel to the direction of the pipeline, it only induces bending strains and therefore, the response is the lowest. Under motions subjected in horizontal and vertical planes at an angle of $45^{\circ}$ from the longitudinal axis of the buried pipeline, the axial deformation is shown to contribute greatly to the response of the pipelines. When imposing two-components simultaneously, the calculated response is similar to the case where only single-component is imposed. It is because one component only induces bending strain, resulting in very small increase in the response. The trend of the response is shown to be quite similar for recorded motions. Therefore, it is concluded that use of a single-component is sufficient for estimation of the longitudinal response of buried pipelines.
Keywords
3D shell-spring model; Buried pipeline; Soil-sturucture interaction; Axial strain; Bending strain;
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