Effect of Near-Fault Vertical Ground Motions on the Seismic Response of Bridges with Rocking Foundations

2021 ◽  
pp. 95-107
Author(s):  
Omar El-Hawat ◽  
Behzad Fatahi ◽  
Mohammadreza Mostafa
Keyword(s):  
Seismic Response ◽  
Ground Motions ◽  
Near Fault ◽  
Vertical Ground Motions ◽  
Vertical Ground ◽  
Rocking Foundations

Effect of Near-Fault Vertical Ground Motions on Seismic Response of Highway Overcrossings

2008 ◽  
Vol 13 (3) ◽  
pp. 282-290 ◽  
Author(s):  
Sashi K. Kunnath ◽  
Emrah Erduran ◽  
Y. H. Chai ◽  
Mark Yashinsky
Keyword(s):  
Seismic Response ◽  
Ground Motions ◽  
Near Fault ◽  
Vertical Ground Motions ◽  
Vertical Ground

scholarly journals Seismic Response Analysis of an Isolated Structure with QZS under Near-Fault Vertical Earthquakes

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Dewen Liu ◽  
Yang Liu ◽  
Dongfa Sheng ◽  
Wenyuan Liao
Keyword(s):  
Bearing Capacity ◽  
Seismic Response ◽  
Large Deformation ◽  
Seismic Isolation ◽  
Ground Motions ◽  
Damping Ratio ◽  
Isolation System ◽  
Near Fault ◽  
Vertical Ground Motions ◽  
Vertical Ground

Seismic isolation devices are usually designed to protect structures from the strong horizontal component of earthquake ground shaking. However, the effect of near-fault (NF) vertical ground motions on seismic responses of buildings has become an important consideration due to the observed building damage caused by vertical excitation. As the structure needs to maintain its load bearing capacity, using the horizontal isolation strategy in vertical seismic isolation will lead to the problem of larger static displacement. In particular, the bearings may generate large deformation responses of isolators for NF vertical ground motions. A seismic isolation system including quasi-zero stiffness (QZS) and vertical damper (VD) is used to control NF vertical earthquakes. The characteristics of vertical seismic isolated structures incorporating QZS and VD are presented. The formula for the maximum bearing capacity of QZS isolation considering the stiffness of vertical spring components is obtained by theoretical derivation. From the static analysis, it is found that the static capacity of the QZS isolation system with vertical seismic isolation components increases when the configurative parameter reduces. Seismic response analyses of the seismic isolated structure model with QZS and VD subjected to NF vertical earthquakes are conducted. The results show that seismic responses of the structure can be controlled by setting the appropriate static equilibrium position, vertical isolation period, and vertical damping ratio. Adding a damping ratio is effective in controlling the vertical large deformation of the isolator.

Amplification Effect of Near-Fault Vertical Ground Motions on Horizontal Deformation Response of Structures

2012 ◽  
Vol 204-208 ◽  
pp. 2713-2718
Author(s):  
Jiang Yin ◽  
Xian Yan Zhou ◽  
Jian Yin
Keyword(s):  
Ground Motions ◽  
Time History ◽  
Linear Displacement ◽  
Horizontal Deformation ◽  
Concrete Frames ◽  
Concrete Frame ◽  
Deformation Response ◽  
Near Fault ◽  
Vertical Ground Motions ◽  
Vertical Ground

In this paper, the amplification to structural non-linear displacement response caused by near-fault vertical ground motions is investigated quantitatively. Based on a set of 30 acceleration records of near-fault ground motions, two typical concrete frame structures, as numerical examples, are examined by means of nonlinear dynamic time-history analysis at two different stages: (1) through the application of horizontal components of acceleration records, (2) through application of the combined horizontal and vertical components at the same time. The numerical results show that the maximum floor-displacements of two concrete frames are limitedly amplified by the vertical effect of near-fault ground motion. On the other side, the maximum inter-story drifts are amplified obviously, and the magnification caused by the vertical effect is about 15%~20% on average. Hence it is evident that the amplification of near-fault vertical effect on horizontal deformation response could not be neglected, and worth serious consideration in future seismic design and evaluation.

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