Gautreau

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Published on January 1, 2008

Author: Nellwyn

Source: authorstream.com

Unknown Bridge Foundations Finding a Solution:  Unknown Bridge Foundations Finding a Solution ggautrea@dotd.state.la.us and www.fdh-inc.com Louisiana DOTD and FDH, Inc. Baton Rouge, LA and Raleigh, NC For Louisiana DOTD:  For Louisiana DOTD Gill M. Gautreau, P.E., Bridge Maintenance Engineer Jack Manno, P.E., Hydraulics Engineer FOR FDH, Inc. Senior Principals:  FOR FDH, Inc. Senior Principals John S. Fisher, Ph. D., P. E., Chairman NCSU Civil Engineering Faculty John D. Hunter, President Ex-IBM Executive J. Darrin Holt, Ph. D., P. E., Vice-Pres. NCSU, NCDOT Unknown Bridge Foundations How widespread is the problem?:  Unknown Bridge Foundations How widespread is the problem? 5,000+ of 10,000 bridges over water in Louisiana alone have unknown foundations. ~ 90,000 of 500,000 bridges nationwide. Bridges in Louisiana:  Bridges in Louisiana Scour Critical Bridges:  Scour Critical Bridges Unknown Foundation Bridges:  Unknown Foundation Bridges Why are unknown foundations a problem?:  Why are unknown foundations a problem? Many Bridges with known foundations are scour critical. Many with unknown foundations may be scour critical. Records non-existent (lost, destroyed, etc.). Records incomplete or even wrong. Original contractors may no longer be around. I-90 over Schoharie Creek:  I-90 over Schoharie Creek HEC 18 and HEC 20:  HEC 18 and HEC 20 FHWA Hydraulic Engineering Circulars HEC 18 addresses bridge related scour. HEC 20 addresses general stream changes. Both must be combined to present clear prediction of scour problem. HEC 18 Scour Predictions:  HEC 18 Scour Predictions       HEC 20 Scour Predictions:  HEC 20 Scour Predictions Possible Steps for Tackling the Problem:  Possible Steps for Tackling the Problem Gather all existing information. Bridge Maintenance Records? State Archives? Persons that may have worked on a project? Collect soils information. Determine likely foundation type. Formulate a plan for testing/investigation. Design solution. Possible Tools for Unknown Foundation Investigations:  Possible Tools for Unknown Foundation Investigations Probing (rod & hammer - what’s under ground?) Pulse-Echo (large width to thickness = spreads) Ground Penetrating Radar (GPR) (site dependent) Borehole methods (site dependent) Dispersive Wave (slender members) Rod and Hammer:  Rod and Hammer Labor Intensive Depth, soil dependent May find spreads, pile lengths? Slide16:  Computer Strike The Pulse-Echo Methods Strike Transducer Transducer Caisson / Auger cast (Be Careful ! - Dispersion occurs) Concrete Concrete Slide17:  FDH’s technology is nondestructive, easy to apply, and does not require the site to be taken out of service. FDH does not utilize conventional pile testing technologies. The mathematics were developed by the FDH Principals. Slide18:  Ground Penetrating Radar (GPR) Uses electromagnetic waves to determine approximate distance to targets. Highly soil/ site dependent, good for finding metals. Finding concrete ? Slide19:  Oscilloscope Strike Idea: Measures transit time from foundation to transducer (Hydrophone/ Geophone) Borehole Borehole Methods Dispersive Wave Methods:  Dispersive Wave Methods Researched by FDH’s principals at NCSU NCDOT/FHWA Funded Research Verified Technology over Past 12 Years Many DOT “blind tests” to Validate Broad Applications (timber, steel H, concrete) Previously used/adopted by NCDOT Background:  Background Douglas’ 1983 research The timber pile length project - 1990 Fisher, Douglas, Holt (grad student) Applications in steel, concrete driven piles Tower applications lead to other foundation types and geometry beyond piles. Projects: Wharves, buildings, bridges, towers, dams, etc. Research Approach:  Research Approach Laboratory models and software development. Field trials with known & unknown foundations. Slide23:  Where it all began.. Timber pile bridges NCDOT & FHWA’s interest Slide24:  Strike a pile on its side to create Dispersive wave motion. (bending, flexural waves) Record the wave motion. Analyze data for length/condition Dispersive Wave Propagation:  Dispersive Wave Propagation Most difficult of all wave motions to handle. Waves continually change their shape and appearance. No mathematical solution to their motion existed. Required ~10 years of experimental work. Began in 1983. Slide31:  Data Acquisition Portable Slide32:  Steel pile testing. Same principles apply. Slide33:  Concrete is more difficult, but can be tested for length and condition (breaks). Slide34:  Pile testing at a wharf in NC Slide36:  Sometimes conditions require a bigger hammer. Slide37:  Testing can even be done underwater. Foundation Types FDH has Tested:  Foundation Types FDH has Tested Driven, Cast-in-Place piles Spread footings Caissons (drilled piers) Auger cast piles Buried concrete blocks Tie-back rods Sheet Piles “Blind tests” of Dispersive Wave Technology:  “Blind tests” of Dispersive Wave Technology Slide43:  State of Mississippi Extracting piles to directly verify technology. October 1998 Slide44:  A full day to pull 10 piles. Slide46:  Pile was broken probably during original installation Slide47:  Another broken pile. Slide48:  Unknown, deteriorated pile. Dispersive wave data identified this damage. Key Features of DWT... Nondestructive Robust Structure remains in service Can be used underwater (have used in 60 ft of water) Has been verified with existing records and pile extractions.:  Key Features of DWT... Nondestructive Robust Structure remains in service Can be used underwater (have used in 60 ft of water) Has been verified with existing records and pile extractions. DOT Bridge Foundation Testing:  DOT Bridge Foundation Testing NC, SC, GA, FL, AL, MS, LA, TN, KY, MN, ID Managed a $1 Mil.+ unknown bridge foundation contract in MS. FDH Has Extensive National Experience All states except: MT, ND, AK Prime contractor for : 170 telecom sites, 1000 + unknown foundations in 4 months. The FDH Team:  The FDH Team Registered PE’s with advanced degrees in Civil Engineering Mathematician Physicist Experienced Field Technicians trained in NDT technologies Project Managers Publications...:  Publications... Transportation Research Board Various ASCE Seminars and Meetings Various State DOT Engineers’ meetings. Featured in Wireless Review magazine

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