@Article{cmes.2022.018113,
AUTHOR = {Yuhang Jin, Endong Guo, Houli Wu, peilei Yan},
TITLE = {Dynamic-Response Analysis of the Branch System of a Utility Tunnel Subjected to Near-Fault and Far-Field Ground Motions in Different Input Mechanisms},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {130},
YEAR = {2022},
NUMBER = {1},
PAGES = {167--186},
URL = {http://www.techscience.com/CMES/v130n1/45730},
ISSN = {1526-1506},
ABSTRACT = {There are few studies on the dynamic-response mechanism of near-fault and far-field ground motions for large
underground structures, especially for the branch joint of a utility tunnel (UT) and its internal pipeline. Based on
the theory of a 3D viscous-spring artificial boundary, this paper deduced the equivalent nodal force when a P wave
and an SV wave were vertically incident at the same time and transformed the ground motion into an equivalent
nodal force using a self-developed MATLAB program, which was applied to an ABAQUS finite element model.
Based on near-fault and far-field ground motions obtained from the NGA-WEST2 database, the dynamic responses
of a utility tunnel and its internal pipeline in different input mechanisms of near-fault and far-field ground motions
were compared according to bidirectional input and tridirectional input, respectively. Generally, the damage to
the utility tunnel caused by the near-fault ground motion was stronger than that caused by the far-field ground
motion, and the vertical ground motion of near-fault ground motion aggravated the damage to the utility tunnel.
In addition, the joint dislocation of the upper and lower three-way joints of the pipeline in the branch system under
the seismic action led to local stress concentrations. In general, the branch system of the utility tunnel had good
seismic performance to resist the designed earthquake action and protect the internal pipeline from damage during
the rare earthquake.},
DOI = {10.32604/cmes.2022.018113}
}