A semi-analytical model for estimating seismic behavior of buried steel pipes at bend point under propagating waves

2013 ◽  
Vol 11 (5) ◽  
pp. 1373-1402 ◽  
Author(s):  
Miad Saberi ◽  
Farhad Behnamfar ◽  
Mahmood Vafaeian
Keyword(s):  
Analytical Model ◽  
Seismic Behavior ◽  
Steel Pipes ◽  
Propagating Waves

scholarly journals Comparison of the Results of Analytical and Numerical Models of Pre-Reinforcement in Shallow Tunnels

2017 ◽  
Vol 63 (4) ◽  
pp. 135-148 ◽  
Author(s):  
D. Peila ◽  
C. Marchino ◽  
C. Todaro ◽  
A. Luciani
Keyword(s):  
Analytical Model ◽  
Numerical Models ◽  
Three Dimensional ◽  
Tunnel Face ◽  
Steel Pipes ◽  
Flac 3D ◽  
Comparison Of The Results ◽  
Weak Rock Masses ◽  
Analytical Approaches ◽  
Design Aspect

AbstractThe steel pipe umbrella is a widely used technology when tunnelling in weak soils in order to create pre-support ahead of the tunnel face. The design of steel pipes is frequently done through simplified analytical approaches which are easy to apply but require proper assessment of the loads acting on the pipe. To provide information on this key design aspect, the results of the comparison between a three-dimensional numerical model developed with the code FLAC 3D and an analytical model based on the approach of a beam on yielding supports is presented and discussed. The comparison refers to a shallow tunnel with an overburden of three times its diameter for two different types of weak rock masses. The obtained results provide suggestions about the load that has to be applied in the analytical model for the design phase.

Shaking table tests of a single-span freestanding rocking bridge for seismic resilience and isolation

2019 ◽  
Vol 22 (15) ◽  
pp. 3222-3233
Author(s):  
Xiu-Li Du ◽  
Yu-Long Zhou ◽  
Qiang Han ◽  
Zhen-Lei Jia
Keyword(s):  
Experimental Study ◽  
Analytical Model ◽  
Seismic Behavior ◽  
Experimental Results ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Peak Displacement ◽  
Bridge Model ◽  
Earthquake Resilience ◽  
Seismic Resilience

Rocking philosophy has advantages to maintain a preferable post-earthquake serviceability as an alternative of seismic resistant systems. This article presents an experimental study on the seismic behavior of a rocking bridge with freestanding columns capped with a freely supported deck. A 1/10 scaled, single-span double-column freestanding bridge was constructed and tested on a shaking table. The experimental results showed that the bridge model could undergo large rocking with enough stability under earthquakes and presented excellent post-earthquake resilience after earthquakes with limited damage and negligible residual displacement. The rocking bridge model also exhibited expected isolation efficiency, which increases as the level of excitations becomes more severe. In addition, an analytical model based on multi-block rocking mechanisms was used to calculate the displacement response. Compared with the experimental results, this analytical model well predicts the peak displacement of the rocking bridge model.

Analytical Model to Capture the In-Plane and Out-of-Plane Seismic Behavior of Nonstructural Partition Walls with Returns

2017 ◽  
Vol 143 (6) ◽  
pp. 04017033 ◽  
Author(s):  
Esmaeel Rahmanishamsi ◽  
Siavash Soroushian ◽  
Emmanuel “Manos” Maragakis ◽  
Reihaneh Sarraf Shirazi
Keyword(s):  
Analytical Model ◽  
Seismic Behavior ◽  
Partition Walls ◽  
Out Of Plane

scholarly journals Numerical Analytical Model for Seismic Behavior of Prestressing Concrete Bridge Column Systems

2011 ◽  
Vol 14 ◽  
pp. 2333-2340 ◽  
Author(s):  
Zhiqiang Wang ◽  
Wei Song ◽  
Yuanyuan Wang ◽  
Hongyi Wei
Keyword(s):  
Analytical Model ◽  
Seismic Behavior ◽  
Concrete Bridge ◽  
Bridge Column
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