Dynamic Performance Characteristics of Pervious Concrete Pile Composite Foundations under Earthquake Loads
Publication: Journal of Performance of Constructed Facilities
Volume 31, Issue 5
Abstract
With the advantages of both granular piles and rigid piles, pervious concrete piles (PCPs) are especially suitable for improving ground bearing capacity. To study the dynamic performance characteristics of PCP composite foundation under earthquake loads, the acceleration response of subgrade and the development and dissipation of excess pore water pressure in composite foundation during the earthquake were numerically calculated. The dynamic performances of PCP were compared with those of gravel pile and low-grade concrete pile. The surface acceleration amplification coefficient of PCP composite foundation is obviously smaller than two other composite foundations. Meanwhile, its predominant period is only half that of the gravel pile and low-grade concrete pile composite foundation, which demonstrates that PCP composite foundation is more effective for avoiding the mechanical resonance of the upper building. Besides the significant damping effect, it also has obvious pressure-reduction effect. The excess pore water pressure induced by an earthquake dissipates quickly because of the high permeability of PCPs, and foundation liquefaction is effectively inhibited. Consequently, the draining-damping coupling effect of PCPs can improve deformation compatibility of soil during the earthquake.
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Acknowledgments
This work is supported by the National Program on Key Basic Research Project of China (973 Program) (No. 2015CB058101), the Science Fund for Distinguished Young Scholars of Shandong Province (No. JQ201416), the Natural Science Foundation of China (Nos. 51479105, 51279094, 51308324, and 51379115), the Program for New Century Excellent Talents in University of the Ministry of Education of China (NCET-13-0340), the Fundamental Research Funds of Shandong University (No. 2014YQ013), and the China Postdoctoral Science Foundation (2014M561761).
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Published In
Journal of Performance of Constructed Facilities
Volume 31 • Issue 5 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jul 20, 2016
Accepted: Jan 27, 2017
Published online: Apr 25, 2017
Discussion open until: Sep 25, 2017
Published in print: Oct 1, 2017
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