Residual displacement ratio demand of oscillators representing HSSF-EDBs subjected to near-fault earthquake ground motions

2019 ◽  
Vol 191 ◽  
pp. 598-610 ◽  
Author(s):  
Ke Ke ◽  
Wei Wang ◽  
Michael C.H. Yam ◽  
Lu Deng
Keyword(s):  
Ground Motions ◽  
Residual Displacement ◽  
Near Fault ◽  
Earthquake Ground Motions ◽  
Displacement Ratio

Performance of bi-directional elliptical rolling rods for base isolation of buildings under near-fault earthquakes

2017 ◽  
Vol 21 (5) ◽  
pp. 675-693 ◽  
Author(s):  
Aruna Rawat ◽  
Naseef Ummer ◽  
Vasant Matsagar
Keyword(s):  
Base Isolation ◽  
Ground Motions ◽  
Frictional Resistance ◽  
Curved Surface ◽  
Isolation System ◽  
Near Fault ◽  
Earthquake Ground Motions ◽  
Base Isolation System ◽  
Near Fault Earthquakes ◽  
Storey Building

Rolling base isolation system provides effective isolation to the structures from seismic base excitations by virtue of its low frictional resistance. Herein, dynamic analysis of flexible-shear type multi-storey building mounted on orthogonally placed elliptical rolling rod base isolation systems subjected to bi-directional components of near-fault earthquake ground motions is presented. The orthogonally placed rods would make it possible to resist the earthquake forces induced in the structure in both the horizontal directions. The curved surface of these elliptical rods has a self-restoring capability due to which the magnitude of peak isolator displacement and residual displacement is reduced. The roughness of the tempered curved surface of the rollers dissipates energy in motion due to frictional damping. The seismic performance of the multi-storey building mounted on the elliptical rolling rod base isolation system is compared with that mounted on the sliding pure-friction and cylindrical rolling rod systems. Parametric studies are conducted to examine the behavior of the building for different superstructure flexibilities, eccentricities of the elliptical rod, and coefficients of friction. It is concluded that the elliptical rolling rod base isolation system is effective in mitigation of damaging effects of the near-fault earthquake ground motions in the multi-storey buildings. Even under the near-fault earthquake ground motions, the base-isolated building mounted on the elliptical rolling rods shows considerable reduction in seismic response. The isolator displacement with the elliptical rolling rod base isolation system is less in comparison to the pure-friction and cylindrical rolling rod systems.

Influence of Isolation Gap Size on the Collapse Performance of Seismically Base-Isolated Buildings

2013 ◽  
Vol 29 (4) ◽  
pp. 1477-1494 ◽  
Author(s):  
Zhe Qu ◽  
Shoichi Kishiki ◽  
Toshiyuki Nakazawa
Keyword(s):  
Seismic Performance ◽  
Potential Risk ◽  
Ground Motions ◽  
Retaining Walls ◽  
Incremental Dynamic Analysis ◽  
Far Field ◽  
Gap Size ◽  
Near Fault ◽  
Earthquake Ground Motions ◽  
Isolation Period

The pounding of retaining walls forms a potential risk of degrading the performance of seismically base-isolated buildings subjected to strong, especially near-fault, earthquake ground motions. Incremental dynamic analysis is employed to generate the so-called gap graph, in which two characteristic gap sizes of a base-isolated building are related with the isolation period of the building and the strengthof the superstructure. Thegapgraph canbe usedto evaluate the required gap size for a base-isolated building to have certain collapse performance. By means of gap graphs, the interdependent relations of gap size with other important factors that influence the seismic performance of the base-isolated building are examined. In particular, the results show that near-fault pulse-like ground motions are likely to impose much higher demand for the isolation gap than far-field ones.

scholarly journals Deconvolution effect of near-fault earthquake ground motions on stochastic dynamic response of tunnel-soil deposit interaction systems

2012 ◽  
Vol 12 (4) ◽  
pp. 1151-1157 ◽  
Author(s):  
K. Hacıefendioğlu
Keyword(s):  
Dynamic Response ◽  
Ground Motions ◽  
Earthquake Ground Motion ◽  
Rigid Base ◽  
Stochastic Dynamic ◽  
The Finite Element Method ◽  
Near Fault ◽  
Earthquake Ground Motions ◽  
Input Model ◽  
The Mean

Abstract. The deconvolution effect of the near-fault earthquake ground motions on the stochastic dynamic response of tunnel-soil deposit interaction systems are investigated by using the finite element method. Two different earthquake input mechanisms are used to consider the deconvolution effects in the analyses: the standard rigid-base input and the deconvolved-base-rock input model. The Bolu tunnel in Turkey is chosen as a numerical example. As near-fault ground motions, 1999 Kocaeli earthquake ground motion is selected. The interface finite elements are used between tunnel and soil deposit. The mean of maximum values of quasi-static, dynamic and total responses obtained from the two input models are compared with each other.

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