Response of a group of piles to liquefaction-induced lateral spreading by large scale shake table testing

2012 ◽  
Vol 38 ◽  
pp. 25-45 ◽  
Author(s):  
S. Mohsen Haeri ◽  
Ali Kavand ◽  
Iraj Rahmani ◽  
Hooman Torabi
Keyword(s):  
Large Scale ◽  
Lateral Spreading ◽  
Shake Table ◽  
Shake Table Testing ◽  
Group Of Piles

Asymmetric input motion for accumulation of lateral ground deformation in laminar container shake table testing

2020 ◽  
pp. 1-14
Author(s):  
Muhammad Zayed ◽  
Ahmed Ebeido ◽  
Athul Prabhakaran ◽  
Zhijian Qiu ◽  
Ahmed Elgamal
Keyword(s):  
Earthquake Engineering ◽  
Ground Deformation ◽  
Numerical Models ◽  
Lateral Spreading ◽  
Practical Significance ◽  
Shake Table ◽  
Shake Table Testing ◽  
Sloping Ground ◽  
Preferred Direction ◽  
Experimental Response

Due to seismic response, accumulation of permanent ground deformation (lateral spreading) is an important mechanism of much practical significance. Such deformations typically occur near a ground slope, behind retaining structures such as sheet-pile and quay walls, and in mildly sloping ground. In conducting a shake table test, the generation of permanent deformations further elucidates the underlying mechanisms and allows for related ground–foundation–structure response insights. In this paper, an approach for development of accumulated ground deformations is presented, in which asymmetric inertial loading results in a biased dynamic one-dimensional shear state of stress. As such, the proposed approach allows for further insights into the soil cyclic response and pore pressure build-up, with deformations accumulating in a preferred direction. To permit a virtually unlimited number of such loading cycles, focus is placed on motions that do not cause the shake-table actuator to accumulate displacement, in view of its possible limited stroke. Using this approach, representative experimental response is outlined and discussed. This experimental response can be used for calibration of numerical models to emulate the observed permanent strain accumulation profile and associated mechanisms. In addition to liquefaction-induced lateral spreading, this asymmetric shaking approach might be beneficial for a wide class of earthquake engineering shake table testing applications.

scholarly journals Implementation of a Novel Inertial Mass System and Comparison to Existing Mass-Rig Systems for Shake Table Experiments

2021 ◽  
Vol 11 (2) ◽  
pp. 692
Author(s):  
Alvaro Lopez ◽  
Peter Dusicka
Keyword(s):  
Seismic Performance ◽  
Large Scale ◽  
Inertial Mass ◽  
Setup Time ◽  
Shake Table ◽  
Shake Table Testing ◽  
Earthquake Excitation ◽  
Mass System ◽  
Using Data ◽  
Shake Table Experiments

Shake table testing is one of the more effective experimental approaches used to study and evaluate seismic performance of structures. Reduced-scale models can still result in large-scale specimens where incorporating the required inertial mass effectively and safely can be challenging. This study proposes a new system of arranging the mass in the experiments that combines the realism of mass participation during earthquake excitation when supported by the shake table with laboratory practicality considerations of the mass positioned off the specimen. The characteristics and dynamic motion equations for the proposed system are described and applied to shake table experiments involving large-scale cantilevered columns. Using data from large-scale experiments to validate a numerical model, the proposed approach was numerically compared to two other testing approaches. Based on the measured performance and the validated numerical simulations, it can be concluded that the proposed inertial mass system can result in seismic performance as if the mass was placed directly on top of the specimen. Combined with the advantages of reduced setup time, incorporating safety restraints and direct measurement of inertial loads, the proposed system can be suitably used for effective shake table testing of large-scale specimens taken to non-linear near-collapse performance levels.

Large-Scale Liquefaction and Postliquefaction Shake Table Testing

2020 ◽  
Vol 146 (12) ◽  
pp. 04020138
Author(s):  
R. E. S. Moss ◽  
T. R. Honnette ◽  
J. S. Jacobs
Keyword(s):  
Large Scale ◽  
Shake Table ◽  
Shake Table Testing
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