000			03234 a a2200325 04500
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003			CoBo-ECI
005			20230201133113.0
008			150717b xxu||||| |||| 00| 0 eng d
020			_aISSN 1520295X
082	0		_a624 _bG659c
100	4	0	_aGonzález Lagos, Lenart Luis _914663
245	0		_aCentrifuge Modeling of Permeabilty and Pinning Reinforcement Effects on Pile Response to Lateral Spreading/ _cLenart Luis Gonzalez Lagos; Tarek Abdoun and Ricardo Dobry
260	4		_aNew York: _bUniversity at Buffalo _c2007
300	4		_a354 p.
490			_aTechnical report (Multidisciplinary Center for Earthquake Engineering Research (U.S.); _vMCEER 07-0020
504	4		_aIncluye bibliografía p. 323
520	4		_aThe vulnerability of highway bridges to earthquake-induced ground failures arising from liquefaction has been clearly demonstrated by the extensive damage observed in the past earthquakes, particularly when a nonliquefied soil layer rides on top of the liquefied soil. Liquefaction induced lateral spreading may be reduced by the restraining forces provided by pile group foundations. This reduction in lateral displacement reduces the loads and displacement demands that are imposed on the piles. The first part of this work presents experimental results and analyses of six centrifuge tests that were conducted at the 150 g-ton RPI centrifuge to investigate the effect of soil permeability in the response of single piles and pile groups to lateral spreading. In the models that simulate a liquefiable coarse sand layer (saturated with water), the piles bounced back after a couple of cycles of shaking _ahowever in the models that simulate a liquefiable fine sand layer (saturated with viscous fluid), the piles never bounced back, reaching maximum displacements and bending moments as large as 6 times the one measured in the models saturated with water. In the models with lower soil permeability (saturated with viscous fluid) the results and analyses indicate that negative excess pore pressures developed close to the foundations stiffened the soil, increasing the effective area subjected to the liquefied soil pressure, explaining hence the large bending moments. The second part presents experimental results and analyses of four centrifuge tests that were conducted at the RPI centrifuge. The project was to study the reinforcing or pinning effect the pile groups have on the lateral spreading. An analysis approach developed in this study proved to be very useful in understanding the reinforcement effect pile groups have in liquefaction induced lateral spreading and to give a good estimation, at least in centrifuge modeling, of the expected pile group deformations
650			_aMODELOS CENTRIFUGOS _914664
650			_aESTUDIOS DE VULNERABILIDAD SISMICA _914665
650			_aPUENTES _95767
650			_aDESPENDIMIENTO DE TIERRAS _914666
650			_91268 _aCIMENTACIONES _6PRUEBAS
650			_aPERMEABILIDAD DE SUELOS _914667
650			_9118 _aINGENIERÍA CIVIL
650			_92656 _aCARRETERAS _zINFRAESTRUCTURA
700	4	0	_aDobry, Ricardo _aAbdoun, Tarek _914668
942			_2ddc _cBK
999			_c11312 _d11312