Assessment of the Effect of Inertia Forces in Problems of Underground Pipeline Seismodynamics
D.A. Bekmirzaev1, R.U. Kishanov2

1Bekmirzaev Diyorbek Abdugapporovich*, Senior Researcher, Institute of Mechanics and Seismic Stability of Structures of the Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan,
2Kishanov Ruslan Urazgalievich, Lecturer at the Department “Bridges, Tunnels and Overpasses” of the Tashkent Institute of Design, Construction and Maintenance of Automobile Roads, Tashkent, Uzbekistan.
Manuscript received on December 15, 2019. | Revised Manuscript received on December 24, 2019. | Manuscript published on January 10, 2020. | PP: 500-503 | Volume-9 Issue-3, January 2020. | Retrieval Number: C8526019320/2020©BEIESP | DOI: 10.35940/ijitee.C8526.019320
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Abstract: A research to assess the effect of inertia forces in solving specific problems of seismodynamics of underground life support systems is conducted in the paper. A calculation algorithm is constructed using the finite difference method; a system of applied programs based on the developed algorithms and their debugging is created. Dangerous points of maximum normal stress occurrence under seismic loading in underground pipeline are determined taking into account elastic pipe-soil system interaction. The limits of inertial load effect on the behavior of underground systems are estimated. The possibility of considering the seismodynamic problems of underground structures in quasistatic and static statements is substantiated theoretically. The methods of solving the equations of underground pipeline vibrations are given with account for elastic interactions in the pipe-soil system under seismic effect – seismodynamic and quasistatic methods. The conducted computational and experimental studies allow solving the problems of assessing the stress-strain state of pipelines under seismic loading, which is important for practical calculations. 
Keywords: Underground Pipeline, Seismo-dynamics, Seismic Effect, Interaction, Soil, Elastic Constants, Parameters of the Viscosity, Model, Seismic Load.
Scope of the Article: Behaviour of Structures under Seismic Loads