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Influence of vertical ground motion on the seismic response of underground structures and underground-aboveground structure systems in liquefiable ground
Highlights Analysis for underground structure in liquefiable sand with vertical motion. Vertical ground motion increases underground structure column axial force. Aboveground structure amplifies the influence of vertical input motion. Relative position of the structures affects underground structure response.
Abstract Vertical ground motion components are often observed during earthquakes, which could affect the seismic performance of underground structures. This study investigates the influence of vertical ground motion on the seismic response of underground structures and underground-aboveground structure systems (UASS) in liquefiable ground. Both centrifuge shaking table tests and numerical simulations are conducted. The centrifuge shaking table tests provide basic insights into the seismic response of underground structures under simultaneous horizontal and vertical shaking, and also serve to validate the numerical simulation method. Numerical simulations are conducted using solid–fluid coupled FEM with a constitutive model for soil liquefaction analysis. The analysis results show that although the influence of vertical ground motion on the shearing related motions and internal forces of underground structures is limited, its influence on the axial force of the structure is significant, especially for the center column. The inertia effect of the aboveground structure in UASS can amplify the influence of vertical ground motion via structure-soil-structure interaction. For UASS, the horizontal and vertical relative positions of the aboveground structure and the underground structure also affect the influence of vertical ground motion.
Influence of vertical ground motion on the seismic response of underground structures and underground-aboveground structure systems in liquefiable ground
Highlights Analysis for underground structure in liquefiable sand with vertical motion. Vertical ground motion increases underground structure column axial force. Aboveground structure amplifies the influence of vertical input motion. Relative position of the structures affects underground structure response.
Abstract Vertical ground motion components are often observed during earthquakes, which could affect the seismic performance of underground structures. This study investigates the influence of vertical ground motion on the seismic response of underground structures and underground-aboveground structure systems (UASS) in liquefiable ground. Both centrifuge shaking table tests and numerical simulations are conducted. The centrifuge shaking table tests provide basic insights into the seismic response of underground structures under simultaneous horizontal and vertical shaking, and also serve to validate the numerical simulation method. Numerical simulations are conducted using solid–fluid coupled FEM with a constitutive model for soil liquefaction analysis. The analysis results show that although the influence of vertical ground motion on the shearing related motions and internal forces of underground structures is limited, its influence on the axial force of the structure is significant, especially for the center column. The inertia effect of the aboveground structure in UASS can amplify the influence of vertical ground motion via structure-soil-structure interaction. For UASS, the horizontal and vertical relative positions of the aboveground structure and the underground structure also affect the influence of vertical ground motion.
Influence of vertical ground motion on the seismic response of underground structures and underground-aboveground structure systems in liquefiable ground
Wang, Rui (author) / Zhu, Tong (author) / Yu, Jia-Ke (author) / Zhang, Jian-Min (author)
2021-12-25
Article (Journal)
Electronic Resource
English
| Trans Tech Publications | 2013
| British Library Conference Proceedings | 2013
Dynamic Response of Underground Structure Under Bidirectional Shaking in Layered Liquefiable Ground
| Springer Verlag | 2018