Gautreau

Information about Gautreau

Published on January 1, 2008

Author: Nellwyn

Source: authorstream.com

Content

Unknown Bridge Foundations Finding a Solution:  Unknown Bridge Foundations Finding a Solution [email protected] 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

Related presentations


Other presentations created by Nellwyn

The New Right
19. 02. 2008
0 views

The New Right

Bengal Presentation
15. 10. 2007
0 views

Bengal Presentation

notes china
16. 10. 2007
0 views

notes china

sendintheclowns061
17. 10. 2007
0 views

sendintheclowns061

WEST NILE ENCEPHALITIS
23. 10. 2007
0 views

WEST NILE ENCEPHALITIS

s07 info extraction
24. 10. 2007
0 views

s07 info extraction

fp 242
04. 12. 2007
0 views

fp 242

511 Intro
10. 12. 2007
0 views

511 Intro

Lec29 Quantum Atom
15. 10. 2007
0 views

Lec29 Quantum Atom

maher
31. 10. 2007
0 views

maher

Multilateral slideshow
02. 11. 2007
0 views

Multilateral slideshow

MaryAnnWilsonWWILess onplan
11. 10. 2007
0 views

MaryAnnWilsonWWILess onplan

kbirman ams03
30. 10. 2007
0 views

kbirman ams03

Integumentary System
04. 01. 2008
0 views

Integumentary System

Keynote Sobotka
17. 10. 2007
0 views

Keynote Sobotka

Norris AstronomersDataManif esto
08. 10. 2007
0 views

Norris AstronomersDataManif esto

Thomas
09. 10. 2007
0 views

Thomas

eliminating inequalities
02. 11. 2007
0 views

eliminating inequalities

lec2 su06 obsastro
13. 11. 2007
0 views

lec2 su06 obsastro

business in russia 062807
11. 10. 2007
0 views

business in russia 062807

PSA Didymo
04. 01. 2008
0 views

PSA Didymo

Alta Definicion
24. 10. 2007
0 views

Alta Definicion

SPIROCHETES 2006
16. 11. 2007
0 views

SPIROCHETES 2006

The Renunciation Mind
16. 02. 2008
0 views

The Renunciation Mind

ELM market
24. 02. 2008
0 views

ELM market

NSTPRSC SPUR 05 07 SH final
29. 09. 2007
0 views

NSTPRSC SPUR 05 07 SH final

Speeding Aggressive Driving 9 07
27. 02. 2008
0 views

Speeding Aggressive Driving 9 07

weps 11
06. 03. 2008
0 views

weps 11

cavoukian
10. 03. 2008
0 views

cavoukian

ROC
29. 02. 2008
0 views

ROC

enron hih awb
04. 10. 2007
0 views

enron hih awb

Qualcomm Belk
16. 04. 2008
0 views

Qualcomm Belk

sir raman
12. 10. 2007
0 views

sir raman

Slides7
18. 04. 2008
0 views

Slides7

F303 Class 05
28. 04. 2008
0 views

F303 Class 05

oferta publica inicial
22. 10. 2007
0 views

oferta publica inicial

Alpaslan Korkmaz
21. 11. 2007
0 views

Alpaslan Korkmaz

Parents weekend JLB
07. 05. 2008
0 views

Parents weekend JLB

burden of overweight DrTempleman
02. 05. 2008
0 views

burden of overweight DrTempleman

AIShortforAfterDinne rSpeech
02. 05. 2008
0 views

AIShortforAfterDinne rSpeech

majumdar 251005
02. 05. 2008
0 views

majumdar 251005

basa sip
17. 10. 2007
0 views

basa sip

Urata 6 2 06
22. 10. 2007
0 views

Urata 6 2 06

Hughes presentation
25. 10. 2007
0 views

Hughes presentation

Yamada
09. 10. 2007
0 views

Yamada

FoV Latin America Rey
22. 10. 2007
0 views

FoV Latin America Rey

sandra vales
16. 10. 2007
0 views

sandra vales

1 ponencia mexico
22. 10. 2007
0 views

1 ponencia mexico

class 10 synapse formation
16. 10. 2007
0 views

class 10 synapse formation

Basu1
28. 09. 2007
0 views

Basu1

BSR in international politics
15. 10. 2007
0 views

BSR in international politics

novembre
02. 11. 2007
0 views

novembre

Syn05CFServices
16. 11. 2007
0 views

Syn05CFServices

biochem925 2006n
15. 10. 2007
0 views

biochem925 2006n

fermi siterpt 2000
29. 09. 2007
0 views

fermi siterpt 2000

coopis99 sli
23. 10. 2007
0 views

coopis99 sli

IAEA General Intro 2004 MGray
17. 10. 2007
0 views

IAEA General Intro 2004 MGray

sweet
27. 03. 2008
0 views

sweet

Hernado de SotoJuly04
16. 10. 2007
0 views

Hernado de SotoJuly04

vets presentation
29. 12. 2007
0 views

vets presentation

DRU web
07. 11. 2007
0 views

DRU web

outer space4a2
03. 01. 2008
0 views

outer space4a2

H Cai
11. 03. 2008
0 views

H Cai

City of Dalian
12. 10. 2007
0 views

City of Dalian