Experimental and numerical modeling of horizontally-bent buried pipelines crossing fault slip

Abstract

The behavior and response of pipelines subjected to slip fault movement is studied by numerical simulations as well as experimental setup. A finite element modeling is also developed via ABAQUS software. In this study, an artificial accelerogram is applied to the system and matched against the response spectrum according to the standard No. 2800 (Iranian code of practice for seismic resistant design of buildings, 2014). Three different pipe nominal sizes and thicknesses (1 ½ " , 2 " and 4 ") are considered in the experiments on the shaking table. According to the results, plastic hinge as well as the extremum stress and strain is formed in the fixed soil wedge and at locations close to the fault line. Further, as the pipe D/t ratio increases, the plastic hinge forms further away from the fault line. According to the results, the pipe-soil strain ratio (εp/s) has lower values at larger pipe diameters. Also, the axial strains would be greater for the systems with higher (εp/s) ratios.

Study of the seismodynamics of spatially located underground pipelines with a nodal connection of non-orthogonal configuration

“…The seismic motion of the Earth's crust contributes to the appearance of substantial horizontal and vertical strains in soil that can lead to accidents in underground pipelines [1][2][3][4].…”

“…In the past, the seismic design of buried structures has received less attention than the design of surface structures [3][4][5][6][7]. The methods for calculating non-orthogonally connected underground-extended structures with arbitrarily directed seismic effects were developed.…”

Seismic Response of a Water Transmission Pipeline Across a Fault Zone Adopting a Large-Scale Vibration Table Test

“…Considerable numerical simulations and large-scale physical model tests were adopted to analyze structures that cross faults under special and complex conditions. The influence of pipeline shell thickness, buried depth, fault zone width, fault displacement, intersection angle of pipeline and fault, material nonlinear characteristic, etc., were taken into account systematically during the numerical simulations (Joshi et al, 2011;Karamitros et al, 2011;Chen et al, 2012;Yang et al, 2013;Vazouras and Karamanos, 2017;Demirci et al, 2018;Dezhkam and Nouri, 2018;Sarvanis et al, 2018;Yifei et al, 2018;Fard et al, 2019;Fadaee et al, 2020). Centrifuge model tests were implemented for segmental tunnels subjected to a normal fault and for a high-density polyethylene pipeline crossing a strike-slip fault (Abdoun et al, 2009;Kiani et al, 2016).…”