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• W784033202 abstract "The behavior of straight jointed buried pipelines subjected to seismic wave propagation is investigated in this study. A realistic model which takes into account the nonlinearity as well as the variability of the system characteristics is developed and used to analyze this type of pipeline. First, the seismic environment is quantified in terms of the seismic ground strain and ground rotation. Second, the axial and flexural behavior of pipelines is presented. The pipeline systems considered herein are Cast Iron Pipes with Lead Caulked Joints and Ductile Iron Pipes with Rubber Gasketed Joints. In the first part, well established stress/strain relationships for the pipe segment materials are presented. The second part involves the quantification of the mechanical properties of the joints, which show nonlinear behavior and pronounced variability. Third, the soil resistance to axial and lateral movements of the pipeline is studied. Then, an analytical model is constructed to evaluate the response of straight jointed buried pipelines. For this purpose, a nonlinear static formulation is used. The variability of the system characteristics is accounted for by a simplified Monte Carlo simulation technique. The model consists of a number of straight pipe segments surrounded by axial and lateral soil spring-sliders and jointed by axial and rotational nonlinear springs. Results for the response of straight jointed buried pipelines to seismic wave propagation indicate that the variability of system characteristics can have a significant influence upon the response parameters. This influence is stronger for cast iron pipes with lead caulked joints than for ductile iron pipes with rubber gasketed joints. Vulnerability graphs giving the probability of exceedence for selected response parameters as a function of the ground strain, are established for the cast iron system. For the ductile iron system, graphs giving values of selected response parameters as a function of the ground strain are proposed. Of particular interest are the joint displacement and force since damage occurs more frequently at the joints. The effects of ground rotation are found to be negligible. The vulnerability graphs proposed are combined with available information on leakage of lead caulked joints in cast iron systems to develop estimates of damage ratios due to a joint pull-out failure mode. These estimates are benchmarked against observed damage to water systems and are found to yield reasonable results. The proposed procedure could be extended to include a bell crushing failure mode." @default.
• W784033202 created "2016-06-24" @default.
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• W784033202 date "1989-08-24" @default.
• W784033202 modified "2023-09-27" @default.
• W784033202 title "SEISMIC WAVE PROPAGATION EFFECTS ON STRAIGHT JOINTED BURIED PIPELINES. TECHNICAL REPORT" @default.
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