manitoba infrastructure and transportation radbug - august 2014 water management and structures

Manitoba Infrastructure and Transportation RADBUG - August 2014Water Management and Structures

Innovative Overload Permitting in ManitobaAllowing a 363 250 Kg (800,830 LB) G.V.M.

“Superload”

Presented by:Geoffrey C. Oramasionwu, M.Eng., P.Eng.



INTRODUCTION Increased demand to haul heavier loadsMany structures nearing the end of their Service LifeIncreasing number of overload permit applicationsMIT uses the AASHTO LRFD and LRFR Specifications for Design and Load RatingAASHTOware Bridge Rating Program uses a refined rating methodThis AASHTOWare Bridge Rating enabled MIT to review and approve a 363, 250 Kg (800830 LB) overload


THREE TRANSFORMERS, EACH WEIGHED IN AT GVM =175,450 kg (386,800 lbs)

The Overload Permit


• Two self propelled units• Dual 20-line hydraulic trailer units• 16 tires per axle• GVM = 363,250 kg (800,830 lbs)• Total length = 34 m (110ft Approx.)•Total height = 7.435 m (24ft)• Total width = 7.55 m (24.77ft)


Water Management and Structures reviewed three different truck configurations and three different routes before approving the permit application.

ROUTE OPTIONS

Precast Prestressed Concrete I GirderDesigned and built id 1975 for AASHTO HS25 Truck Live LoadIn composite action with a 200 mm (8 in) reinforced concrete deckSeven simply supported spans. Span length = 36.576 m (120 ft)


Red River Bridge

12 m (40 ft) Precast Pre stressed Concrete Channel Girder100 mm (4 in) thick asphalt overlay wearing surface Five simply supported spans. Span length = 11.8 m (38.74 ft)


ST ADOLPHE COULEE BRIDGE

BRIDGE LOAD RATING Manitoba Infrastructure and Transportation RADBUG - August 2014Water Management and Structures

NUMBER OF AXLES = 20AXLE SPACING = 1.5 m

LONGITUDINAL CONFIGURATION DEFINITION


TRANSVERSE CONFIGURATION OF A NON-STANDARD GAGE

8 WHEELS PER AXLEVARIABLE WHEEL SPACING


LONGITUDINAL FOOTPRINT OF TRUCK

OUTPUT OF VEHICLE PLAN


OUTPUT OF VEHICLE AXLE PLAN (AXLE 1)


ACTUAL CROSS-SECTION OF THE BRIDGE

BRIDGE DECK IS MODELED AS SHELL ELEMENTS WITH MATERIAL PROPERTIES BEING THE SAME AS THE BRIDGE DECK


FINITE ELEMENT MODELING

CORE ELEMENT DATA CREATED IN “BrRAT” BRIDGE WORKSPACE WERE EXPORTED TO THE STAAD ENGINESTAAD USES THE INFORMATION TO CREATE THE FINITE ELEMENT MODEL FOR THAT STRUCTUREDECK SLAB SHELL ELEMENTSBEAM INFINETELY STIFF MEMBERS


A UNIT LOAD IS APPLIED AT EACH NODE OF THE SHELL ELEMENTS

Bending Moment, Shear Force and Displacement Envelopes are generated for the Unit Load placed on at each element nodes.

STAAD THREE DIMENTIONAL VIEW OF THE MODEL


3D Stress Influence Surface for the unit Load Case No. 12, Placed at a Shell Node.


STAAD THREE DIMENTIONAL VIEW OF THE MODEL


3D Stress Influence Surface for the unit Load Case No. 6, Placed at a Shell Node.


RED RIVER BRIDGE RATING FACTORS

GIRDER LIMIT STATE CHBDC

AASHTO STANDARD

Single/two or more Lanes

AASHTO LRFD Single/Multi-

Lanes

FINITE ELEMENT MODEL

1 Shear 0.614 0.390/0.390 0.468/0.429 0.131

Moment 0.567 0.390/0.390 0.468/0.429 0.131

2 Shear 0.614 0.98/1.24 0.633/0.731 0.207

Moment 0.525 0.98/1.24 0.436/0.622 0.207

3 Shear 0.614 0.98/1.24 0.633/0.731 0.221

Moment 0.525 0.98/1.24 0.436/0.622 0.221

4 Shear 0.614 0.98/1.24 0.633/0.731 0.231

Moment 0.525 0.98/1.24 0.436/0.622 0.231

5 Shear 0.614 0.85/0.85 0.582/0.619 0.223

Moment 0.567 0.85/0.85 0.582/0.619 0.223


ST. ADOLPHE COULEE BRIDGE RATING FACTORS

GIRDER LIMIT STATE CHBDCAASHTO

STANDARD Single/two or more Lanes

AASHTO LRFD Single/Multi-

Lanes

FINITE ELEMENT MODEL

1 Shear 0.400 1.00/1.00 0.60/0.60 0.055Moment 0.339 1.00/1.00 0.60/0.60 0.055

2 Shear 0.400 0.56/0.72 0.60/0.60 0.172Moment 0.345 0.56/0.72 0.325/0.325 0.172

3 Shear 0.400 0.56/0.72 0.60/0.60 0.180Moment 0.345 0.56/0.72 0.325/0.325 0.180

4 Shear 0.400 0.56/0.72 0.60/0.60 0.089Moment 0.345 0.56/0.72 0.325/0.325 0.089

5 Shear 0.400 0.56/0.72 0.60/0.60 0.089Moment 0.345 0.56/0.72 0.325/.0325 0.089

6 Shear 0.400 0.56/0.72 0.60/0.60 0.180Moment 0.345 0.56/0.72 0.325/.0325 0.180

7 Shear 0.400 0.56/0.72 0.60/0.60 0.172Moment 0.345 0.56/0.72 0.325/.0325 0.172

8 Shear 0.400 1.00/1.00 0.60/0.60 0.055Moment 0.339 1.00/1.00 0.60/0.60 0.055


CHBDC AASHTO Standard Sin-

gle Lane

AASHTO Standard

Multi Lane

AASHTO LRFD Single Lane

AASHTO LRFD Multi Lane

Finite Element Model

0

0.2

0.4

0.6

0.8

1

1.2

1.4

For Red River Bridge

Interior Girder Shear

Interior Girder Moment

Exterior Girder Shear

Exterior Girder Moment


RATING FACTORS FROM DIFFERENT CODES

CHBDC AASHTO Standard Sin-

gle Lane

AASHTO Stan-dard Multi Lane

AASHTO LRFD Finite Element Model

0

0.2

0.4

0.6

0.8

1

1.2

St. Adolphe Coulee Bridge

Interior Girder ShearInterior Girder MomentExterior Girder ShearExterior Girder Moment



LOAD RATING IS CARRIED OUT USING THE CONVENTIONAL BRIDGE RATING PROCEEDURES AS DESCRIBED EARIERIT CAN BE SEEN THAT THIS SUPERLOAD WOULD NOT HAVE BEEN APPROVED IF WE HAD USED THE CONVENTIONAL DISTRIBUTION FACTOR CALCULATION METHOD.



Manitoba Hydro Transformers Nov 3/2012 8 scales linked together (KG) Nov 14/2012 separate weighing, 4 scales/side (KG) FEB 05/2013 separate weighing, 4 scales/side (KG)

axle drive side passenger side drive side passenger side Feb 05/20131 17,550 17,400 7,400 7,150 14,550 7950 7750 15,7002 16,750 17,400 7,450 7,350 14,800 7850 7850 15,7003 17,150 17,600 7,600 7,450 15,050 7900 7950 15,8504 17,600 18,000 7,600 7,300 14,900 7900 8050 15,9505 17,300 17,600 7,500 7,400 14,900 7800 8050 15,8506 17,900 18,400 7,400 7,300 14,700 8050 8150 16,2007 19,050 18,650 9,900 10,450 20,350 9400 9950 19,3508 18,900 18,600 9,800 10,250 20,050 9150 10000 19,1509 19,850 18,900 10,100 10,150 20,250 9250 10000 19,25010 18,800 18,650 10,050 10,200 20,250 8950 9800 18,75011 18,500 19,400 9,750 10,000 19,750 8900 9900 18,80012 18,700 18,900 9,900 9,800 19,700 8850 9750 18,60013 18,650 18,600 9,750 9,700 19,450 8900 9750 18,65014 17,950 19,050 9,850 9,600 19,450 8900 9800 18,70015 17,900 17,750 10,150 9,700 19,850 9050 9650 18,70016 16,250 17,900 9,050 9,150 18,200 9100 9550 18,65017 17,450 17,700 10,500 9,900 20,400 9150 9750 18,90018 17,600 17,550 8,850 9,400 18,250 8950 9500 18,45019 17,500 17,350 8,850 8,950 17,800 8900 9250 18,15020 15,500 17,000 10,500 10,100 20,600 8450 9200 17,650

total 356,850 362,400 181,950 181,300 363,250 total 173,350 183,650 357,000

* During the first weighing, the unit was on an angle, and the mover attempted to maintain levelness by adjusting hydraulics.** The second weighing was on a relatively flat surface, with no pitch adjustments.

0

5,000

10,000

15,000

20,000

25,000

0 5 10 15 20 25

AXL

E W

EIG

HT

AXLE NUMBER

MEASURED WEIGHT OF EACH AXLE

1 st* Nov 3/2012

2nd* Nov 3/2012

Non 14/2012

Feb 05/2013

PORTABLE SCALES


WE ALSO NEEDED TO VERIFY THAT OUR MODEL IS CORRECT BY DOING SOME MEASUREMENTS DURING ONE OF MOVES.


Travel from 8:00 pm – 6:00 am 10 km/h maximum speed Traveling on centreline of bridge Police escort inside the city limits and Manitoba Compliance Officers for traffic control. Total move – three nights


Permit Conditions

Instrumentation and Data Collection


Manitoba Infrastructure and Transportation September 2013Water Management and Structures


manitoba infrastructure and transportation radbug - august 2014 water management and structures

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