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Structural Engineering and Earthquake Simulation Laboratory Task 1 (1g Tests) Experimental and Micromechanical Computational Study of Pile Foundations.

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Presentation on theme: "Structural Engineering and Earthquake Simulation Laboratory Task 1 (1g Tests) Experimental and Micromechanical Computational Study of Pile Foundations."— Presentation transcript:

1 Structural Engineering and Earthquake Simulation Laboratory Task 1 (1g Tests) Experimental and Micromechanical Computational Study of Pile Foundations Subjected to Liquefaction-Induced Lateral Spreading - Task 1 (1g Tests) S. Thevanayagam, UB Research Progress Meeting Feb. 15, 2006, UB-VTC -- Draft PI: R. Dobry, co-PIs: A. Elgamal, S. Thevanayagam, T. Abdoun, M. Zeghal UB-NEES Lab: A. Reinhorn, M. Pitman, J. Hanley, T. Albrechcinski Acknowledgements: T. Kanagalingam, N. Ecemis, Peng Hao

2 Structural Engineering and Earthquake Simulation Laboratory 5.0 m 2.75 m 6.2 m SECTIONAL VIEW PLAN Shaking Frame on Strong Floor Pile ( Test 1A : High EI pile, Test 1B : Low EI pile) =2 or 3 deg. F#55 Sand, Dr~45% 3.35 m 5.6 m 2-D Laminar Box (24 Laminates) Ball Bearings Tests 1 and 2: Single Pile (shaking in perpendicular directions) Yr-1: Tests #1A & 1B Yr-2: Tests #2A & 2B

3 Structural Engineering and Earthquake Simulation Laboratory Tests 3 and 4: Group Pile (shaking in perpendicular directions) Yr-2: Tests #3 Yr-3: Test #4

4 Structural Engineering and Earthquake Simulation Laboratory Year-1 Schedule ( ) – Nov 19, 2005 Meeting

5 Structural Engineering and Earthquake Simulation Laboratory Year-1 Plans ( ) Planning, Design, Fabrication & Instr. Procurement Box, Sand, Control, Ground Motion, Instruments Preparatory Testing Sand Construction, Dry Runs & Preliminary Equipment Tests Saturated Free-Field Liquefaction Level Ground (LG-1) – Harmonic progressive amplitude increase (May-June 06) Sloping Ground (SG-1) - Harmonic progressive amplitude increase (June-July 06) Pre-test Data for FEM/DEM modelers – 2mo before tests for Class A prediction Single Pile High-EI Pile (Test 1A) – Harmonic progressive amplitude increase, g (Aug. 06) Low-EI Pile (Test 1B) – Harmonic progressive amplitude increase, g (Oct. 06) Coordination w/ Centrifuge Tests & IT

6 Structural Engineering and Earthquake Simulation Laboratory Year-1 Schedule ( )

7 Structural Engineering and Earthquake Simulation Laboratory Year-1 Schedule ( )

8 Structural Engineering and Earthquake Simulation Laboratory Laminar Box Dimensions Parameter UnitValue Single laminate thicknessm0.254 Single laminate weightkN7 Empty box weight excluding steel bridge kN168 Empty box weight including steel bridge kN250 Friction between laminates %----- Inter-laminate displacement limit m0.036 Maximum soil volumem3m Maximum weight (soil & box) kN1850 Maximum horizontal acceleration g0.3

9 Structural Engineering and Earthquake Simulation Laboratory Laminar Box – Strong Floor Foot Print Strong Floor – Reserved April 1 – Oct.31, 06

10 Structural Engineering and Earthquake Simulation Laboratory LAMINAR BOX-ACTUATOR Reserved April 1 – Oct.31, 06 Controller – To be tested by Mark Pitman – 3/15- 4/15/06

11 Structural Engineering and Earthquake Simulation Laboratory Laminar Box – Strong Floor Shaking Setup

12 Structural Engineering and Earthquake Simulation Laboratory Loading Frame Design Completed; Quotes Accepted; Purchase in progress; Delivery March15, 06

13 Structural Engineering and Earthquake Simulation Laboratory Strong Floor – Bearing Support

14 Structural Engineering and Earthquake Simulation Laboratory Laminar Box – Strong Floor Modification PLAN VIEW Machined Base Steel Plate – UB NEES Funded

15 Structural Engineering and Earthquake Simulation Laboratory Actuator Loading Setup

16 Structural Engineering and Earthquake Simulation Laboratory Floor Reactions (kips) (Dead Weight) Design Completed; Loading within Tolerable Limits; Strong Floor to be leveled using Steel Base Plate, Funding approved; Purchase in progress

17 Structural Engineering and Earthquake Simulation Laboratory Floor Reactions (kips) (Longitudinal Shaking) See Next Page for results after removing tensions

18 Structural Engineering and Earthquake Simulation Laboratory Floor Reactions (kips) (Longitudinal Shaking) All negative reaction Supports are removed

19 Structural Engineering and Earthquake Simulation Laboratory LG-1 & SG-1 Data for FEM/DEM Modelers Draft Report Released Feb 15, 06. Ground Motion Report – Released Feb. 1, 06. Soils Report -- Thevanayagam, S., Shenthan, T., and Kanagalingam, T., (2003). Role of intergranular contacts on mechanisms causing liquefaction and slope failures in silty sands. Final Report, USGS Award No. 01HQGR0032 and 99HQGR0021; US Geological Survey, Department of Interior, USA, web.er.usgs.gov/reports/abstract/2001/pt/01hqgr0032- report.pdf, 396p. Soil Property Test Data – Available in EXCEL Format

20 Structural Engineering and Earthquake Simulation Laboratory Gradation and Index Properties of OS#55 Sand

21 Structural Engineering and Earthquake Simulation Laboratory Typical Cyclic Triaxial Test Data for OS#55 Sand

22 Structural Engineering and Earthquake Simulation Laboratory Draft Ground Motion: Draft Ground Motion: u max = 0.74 f = 2 Hz f n = 5 – 7 Hz a max = 0.3 g

23 Structural Engineering and Earthquake Simulation Laboratory Expected Pore Pressure Vs Time - Draft Shaking Motion r u vs Time (Based on UB Energy based Liq. Model)

24 Structural Engineering and Earthquake Simulation Laboratory Equipment & Instruments – Plan Equipment & Instruments – Plan Planning & Quotes Completed; Purchase in progress; Delivery April 5, 06

25 Structural Engineering and Earthquake Simulation Laboratory Instrumentation – LG-1 & SG-1 Plan View Instrumentation to be coordinated with NEES-Wood Project

26 Structural Engineering and Earthquake Simulation Laboratory Soil Instrumentation

27 Structural Engineering and Earthquake Simulation Laboratory Instrumentation: Tests LG-1 & SG-1

28 Structural Engineering and Earthquake Simulation Laboratory Instrumentation – Test 1A & 1B (Single Pile)

29 Structural Engineering and Earthquake Simulation Laboratory N-S W-E MEMS Shape Cable Instrumentation – Test 1A & 1B

30 Structural Engineering and Earthquake Simulation Laboratory Instrumentation: Single Pile (Test 1A & 1B) 0

31 Structural Engineering and Earthquake Simulation Laboratory Soil-Pile Instrumentation KRYPTON

32 Structural Engineering and Earthquake Simulation Laboratory Group Pile - Test 3 (Yr-2)

33 Structural Engineering and Earthquake Simulation Laboratory Instrumentation: Test 3 (2x2 Group) 0

34 Structural Engineering and Earthquake Simulation Laboratory Instrumentation: Test 3 (2x2 Group)

35 Structural Engineering and Earthquake Simulation Laboratory Year-1 Status Planning, Design, Fabrication & Procurement Box, Sand, Instruments - Design completed, Quotations received, purchase order in progress – Product Delivery March 15. Instruments Delivery April 15. Box Assembly – Scheduled March 15 – 31 Ground Motion to be discussed - Finalize by April 15 Control – Mark Pitman - Scheduled March 1-April 15 Preparatory Testing Sand Construction, Dry Runs & Preliminary Equipment Tests – Scheduled April 1-30 Saturated Free-Field Liquefaction Level Ground (LG-1) – Scheduled May 1-30 Sloping Ground (SG-1) – Scheduled June 1-30 Pre-test Data for FEM/DEM modelers – Preliminary Report Released Feb. 15 Single Pile High-EI Pile (Test 1A) – Preparation May 1-July31; Testing Aug 1-31 Low-EI Pile (Test 1B) – Preparation May 1-July31; Testing Sept Coordination w/ Centrifuge Tests & IT

36 Structural Engineering and Earthquake Simulation Laboratory Equipment & Instruments – Plan Equipment & Instruments – Plan Planning & Quotes Completed; Purchase in progress; Delivery April 5, 06

37 Structural Engineering and Earthquake Simulation Laboratory Sand Construction - Hydraulic Filling Initial Slurry Pump Tests completed – Oct 05; Sand pumping/Density Control Tests – April 06 (weather)

38 Structural Engineering and Earthquake Simulation Laboratory Hydraulic Placement Methods

39 Structural Engineering and Earthquake Simulation Laboratory Field Hydraulic Fill Placement Methods & CPT Results High Speed Low Speed + Compaction Bottom Dump

40 Structural Engineering and Earthquake Simulation Laboratory Hydraulic Fill – Field CPT Data (Mitchell et al.) Better Control Possible in the Lab. Environment; Includes plans for development of placement controls to achieve desired density ranges

41 Structural Engineering and Earthquake Simulation Laboratory Open for Discussion by All Researchers


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