TY - JOUR ID - 72462 TI - A Continuum Shell-beam Finite Element Modeling of Buried Pipes with 90-degree Elbow Subjected to Earthquake Excitations JO - International Journal of Engineering JA - IJE LA - en SN - 1025-2495 AU - Vafaeian, M. AU - Saberi, Miad AD - Civil Engineering, Isfahan University of Technology Y1 - 2015 PY - 2015 VL - 28 IS - 3 SP - 338 EP - 349 KW - Buried Pipe KW - elbow KW - Finite element method KW - Hybrid Model KW - Continuum model DO - N2 -   In the current work, the seismic analysis of bent region in buried pipes is performed, and effects of soil properties and modeling methods on pipe’s response are investigated. To do this task Beam, Beam-Shell Finite Element modeling and a Continuum shell FE models of a 90 degrees elbow are employed. In the Beam model, the pipe is simulated by beam elements while combined shell-beam elements are used for the Continuum shell finite element model. The surrounding soil is simulated by nonlinear spring and solid elements; moreover, soil hardening behavior and soil-pipe slippage are considered in the models. In addition, an equivalent boundary condition has been employed at the end of each elbow leg to simulate far field effects more closely. From these analyses, it can be revealed that axial strain at bends is larger in stiffer soil due to smaller slippage. In addition, a full three dimensional soil-pipe interaction using Continuum Shell FE model causes a substantial increase of elbow strain. UR - https://www.ije.ir/article_72462.html L1 - https://www.ije.ir/article_72462_9b38055d505a0efb5c2494bcab5a616a.pdf ER -