Pipeline Integrity Management Under Geohazard Conditions (PIMG)
Chapter 25 ANALYSIS OF EARTHQUAKE-RESISTANT DUCTILE IRON PIPE JOINT AT FAULT LOCATION USING ABAQUS - A CASE STUDY FOR SIMULATION BASED PRODUCT QUALIFICATION
Download citation file:
- Ris (Zotero)
- Reference Manager
A seismic event can cause severe damage, including ruptures and leaks to pipelines and distribution systems, leading to environmental hazard, loss of life, and impairment of the infrastructure. An Earthquake-Resistant Ductile Iron Pipe (ERDIP) is capable of absorbing large ground displacements that occur during severe earthquakes by movement of its joints through expansion, contraction, and deflection. This engineering solution brings great potential to reduce environmental hazard and disruption of critical public services for cities with expansive infrastructure that are on a seismically active zone. However, to ensure safe operation and feasibility of design such pipeline products are to be subjected to rigorous verification and validation process. Although physical test based design validation is assuring it is often time not feasible to perform full scale tests of large diameter pipe joints, especially considering the effect of a fault movement within the test framework. Alternative is to use physics based realistic simulation to model the pipe joint behavior and use numerical results to determine if the design meets allowable criteria. A recent study involved design qualification of ERDIP large diameter joint against seismic event using simulation based approach. Utilizing the advanced non-linear modeling capabilities within Abaqus (a Dassault Systèmes FEA simulation software), first the pipe joint stiffnesses were calculated using a 3D model. Validation of the FEA model was performed using physical test data for a small diameter pipe joint. Further analysis was carried out wherein the pipe-soil interactions and the pipe-joint behaviors are represented by sets of non-linear springs. A stretch of the pipeline consisting of many pipe joints was undertaken to ascertain integrity under seismic fault movement conditions. The pipeline was acted upon by a fault rupture at specified azimuth angles and fault length. The simulation predicted that the pipe joints would meet the design criteria if the fault azimuth angle was within a certain threshold.