الفهرس 
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Abstract
In this thesis, the mechanical analysis of the most important gas pipeline components is presented according to the process piping code ASME 31.3. The analysis is focused on dead and live loading cases for a buried pipeline used for transmitting natural gas to buildings. A three dimensional computer model is created in which all significant structural elements are modeled using the CAEPIPE software. This model is used for both static and dynamic loads. Piping vibration problem is discussed by calculating the first twenty natural frequencies and mode shapes. Some pipeline vibration excitation sources and the evaluation of possible solutions are studied. A new approach for piping vibration called dynamic susceptibility is described and the fundamental basis of this method is mentioned with its applications. Some actual loading conditions which the buried gas pipeline may be subjected to, have been studied as the earthquakes, automotive vehicles, footing, slabs, and gas flow. These loading conditions have been covered through ten mathematical model case studies. Some of the basic methods necessary for studying the static and dynamic behavior of buried gas pipelines which can be used as guideline techniques are presented through this study. Results of the pipeline analysis are divided into eight categories, stresses and code compliance, soil restraints, support loads, element forces, pipeline displacements, natural frequencies, mode shapes, and dynamic susceptibility. The results enable designers to provide with more insight into the mechanical characteristics of buried gas pipelines of similar configuration but different geometry.