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Citation |
Pineda-Porras O, Ordaz M. J. Pipeline Syst. Eng. Pract. 2010; 1(4): 141-146. |
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Copyright |
(Copyright © 2010, American Society of Civil Engineers) |
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DOI |
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PMID |
unavailable |
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Abstract |
Though differential ground subsidence (DGS) impacts the seismic response of segmented buried pipelines and increases their vulnerability, there are no fragility formulations that estimate repair rates under such conditions found in the literature. Although physical models that estimate pipeline seismic damage considering other cases of permanent ground subsidence (e.g., faulting, tectonic uplift, liquefaction, and landslides) have been extensively reported, this is not the case for DGS. The refinement of the study of two important phenomena in Mexico City--the 1985 Michoacan earthquake and the sinking of the city due to ground subsidence--has contributed to the analysis of the interrelation of pipeline damage, ground motion intensity, and DGS. From the analysis of the 122 cm (48 in.) diameter pipeline network of the Mexico City water system, fragility formulations for segmented buried pipeline systems for two DGS levels are proposed. The novel parameter PGV2/PGA (composite parameter in terms of peak ground velocity (PGV) and peak ground acceleration has been used as a seismic parameter in these formulations because in previous studies it has shown better correlation to pipeline damage than PGV alone. By comparing the proposed fragility formulations, it is concluded that a change in the DGS level (from low-medium to high) could increase the pipeline repair rates (number of repairs per kilometer) by factors ranging from 1.3 to 2.0, with a higher seismic intensity corresponding to a lower factor. |