SEISMIC RESPONSE OF UNDERGROUND STRUCTURES

2020 ◽  
pp. 145-210
Keyword(s):  
Seismic Response ◽  
Underground Structures

Evaluation of Formation of Plastic Hinge and Seismic Behavior of Steel Structures Due to Soil–Structure–Tunnel Interaction

2020 ◽  
Vol 14 (03) ◽  
pp. 2050014
Author(s):  
Arash Rostami ◽  
Abdolreza S. Moghadam ◽  
Mahmood Hosseini ◽  
Nima Asghari
Keyword(s):  
Seismic Response ◽  
Land Surface ◽  
Plastic Hinge ◽  
Free Field ◽  
Steel Structures ◽  
Underground Structures ◽  
Effective Parameters ◽  
Plastic Hinges ◽  
Underground Cavities ◽  
Real Earthquake

The seismic design of the structures is carried out by technical regulations and codes in free-field conditions (regardless of underground cavities). With the availability of tunnels and the complex interaction between the tunnel and the aboveground structures, which may be contemplated wrongly, it could be dangerous for over ground buildings and structures. Consequently, the examination of the underground tunnels and their impact on the land surface and adjacent buildings seismic response seems to be significant. The present research focuses on formation of the plastic hinges in steel structures due to underground cavities and the soil–tunnel–structure interaction of underground structures. First, an existing model was verified by finite element method and the results were compared with a sample specimen. Thus, several effective parameters were considered and studied such as soil type, multi-story structures (4, 8 and 12 stories) and dynamic load type. Then the models were evaluated under real earthquake records. As a result, the seismic response of the structures and plastic conditions of plastic hinge conditions were obtained. The results indicate that the underground cavities have affected the formation of plastic hinges in the structure. They increased the input energy to the structure and had an impact on the total behavior of the structures. Also, the high-rise structures were much more vulnerable to underground tunnels. Therefore, the structures which are located above the underground cavities should be retrofitted and rehabilitated.

Undrained seismic response of underground structures

2020 ◽  
Author(s):  
Eimar Andrés Sandoval ◽  
Antonio Bobet
Keyword(s):  
Seismic Response ◽  
Underground Structures

Seismic Response of Slab Culvert in Loess Region

2012 ◽  
Vol 204-208 ◽  
pp. 2461-2464 ◽  
Author(s):  
Hai Bo Wang ◽  
Yu Tao Pan ◽  
Jun Min Shen ◽  
Jun Jie Zheng
Keyword(s):  
Numerical Analysis ◽  
Seismic Response ◽  
Seismic Wave ◽  
Incident Angle ◽  
Numerical Results ◽  
Dynamic Loads ◽  
Active Area ◽  
Underground Structures ◽  
Earthquake Resistant ◽  
Loess Region

Buried culverts are usually considered to be earthquake-resistant underground structures. Therefore, few studies have been conducted to investigate the seismic response of slab culverts under high fill embankment which are usually subjected to extreme dynamic loads. This paper presents a numerical analysis of the seismic response of slab culvert under high fill embankment in a loess region which is also a seismically active area in China. The influence of important factors such as fill height, incident angle of seismic wave and magnitude of earthquake on the response of culvert is carefully examined. And possible failures of culverts are also analyzed according to the numerical results.

Analytical solutions for the seismic response of underground structures under SH wave propagation

2008 ◽  
Author(s):  
C. Smerzini ◽  
J. Avilés ◽  
F. J. Sánchez-Sesma ◽  
R. Paolucci ◽  
Adolfo Santini ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Seismic Response ◽  
Analytical Solutions ◽  
Sh Wave ◽  
Underground Structures

scholarly journals An Arc-consistent Viscous-spring Artificial Boundary for Numerical Analysis of the Seismic Response of Underground Structures

2021 ◽  
Author(s):  
Dan Ye ◽  
Shangzhi Yin ◽  
Dengzhou Quan
Keyword(s):  
Numerical Analysis ◽  
Seismic Response ◽  
Shaking Table Test ◽  
Near Field ◽  
Shaking Table ◽  
Test Results ◽  
Underground Structures ◽  
Artificial Boundary ◽  
Finite Element Software ◽  
Artificial Boundaries

Abstract A new arc consistent viscous-spring artificial boundary (ACVAB) was proposed by changing a traditional flat artificial boundary based on the theory of viscous-spring artificial boundaries. Through examples, the concept underpinning the establishment, and specific setting of, the boundary in the finite element software were described. Through comparison with other commonly used artificial boundaries in an example for near-field wave analysis using the two-dimensional (2-d) half-space model, the reliability of the ACVAB was verified. Furthermore, the ACVAB was used in the numerical analysis of the effects of an earthquake of underground structures. The results were compared with shaking-table test results on underground structures. On this basis, the applicability of the ACVAB to a numerical model of the seismic response of underground structures was evaluated. The results show that the boundary is superior to common viscous-spring boundaries in terms of accuracy and stability, and therefore it can be used to evaluate radiation damping effects of seismic response of underground structures and is easier to use.

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