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Comparative Study of Earthquake Input Methods for the Seismic Analysis of Underground Structures
(Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031)
Abstract Considering that the selection of earthquake input methods has a direct impact on the accuracy and reliability of calculation results in the numerical simulation of seismic responses for underground structures, and based on a visco-elastic artificial boundary, this paper analyzes the calculation principles of three input means (acceleration input, displacement input and stress input) and researches the differences among the three methods using ANSYS. The results show that the envelopes of internal force amplitude of the lining are similar, while the numerical differences are quite obvious. A compatible stress input method shall be adopted for the visco-elastic artificial boundary due to the significant effects of different input methods on the efficiency of its energy absorption.
Abstract：
Considering that the selection of earthquake input methods has a direct impact on the accuracy and reliability of calculation results in the numerical simulation of seismic responses for underground structures, and based on a visco-elastic artificial boundary, this paper analyzes the calculation principles of three input means (acceleration input, displacement input and stress input) and researches the differences among the three methods using ANSYS. The results show that the envelopes of internal force amplitude of the lining are similar, while the numerical differences are quite obvious. A compatible stress input method shall be adopted for the visco-elastic artificial boundary due to the significant effects of different input methods on the efficiency of its energy absorption.
WANG Jing-He,
ZHOU Xiao-Jun,
MAO Lu-Lu etc
.Comparative Study of Earthquake Input Methods for the Seismic Analysis of Underground Structures[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(3): 103-109
2015, Vol. 52 