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Bridge Monitoring in South East Central Railway. Presented By P. Barapatre (Chief Bridge Engineer). South East Central Railway, Bilaspur (C.G.). SECTION NOTIFIED FOR RUNNING OF HIGHER AXLE LOAD. DUG – DRZ FOR 25 T AXLE LOAD FOR BOBS JHARSUGUDA- KIRODIMAL NAGAR FOR CC+8+2 FOR BOXN

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Bridge monitoring in south east central railway

Bridge Monitoring in South East Central Railway

Presented By

P. Barapatre

(Chief Bridge Engineer)

South East Central Railway, Bilaspur (C.G.)


Section notified for running of higher axle load

SECTION NOTIFIED FOR RUNNING OF HIGHER AXLE LOAD

DUG – DRZ FOR 25 T AXLE LOAD FOR BOBS

JHARSUGUDA- KIRODIMAL NAGAR FOR CC+8+2 FOR BOXN

KRBA-CPH-BSP-APR-NKG FOR CC+6+2 FOR BOXN AND BOBRN

DKU-KNHN-KPKD-KRDH FOR CC+6+2 FOR BOXN AND BOBRN


Action taken

ACTION TAKEN

(A) DESIGN CHECKING

CHECKING OF SUBSTRUCTURE

CHECKING OF SUPER STRUCTURES

FATIGUE STRESS FOR 2 MILLION CYCLE

FATIGUE STRESS FOR 10 MILLION CYCLE

VERIFICATION OF DESIGN CALCULATION BY RDSO

CLEARANCE FOR RUNNING HIGHER AXLE LOAD


B identification of bridges

(B) IDENTIFICATION OF BRIDGES

BRIDGES ARE IDENTIFIED FOR INSTRUMENTATION BASED ON

ITS STRENGTH

TYPE OF SPAN

TYPE OF GIRDER

OTHER REASON LIKE NON AVAILABILITY OF DRAWINGS


Bridges proposed for instrumentation

Bridges Proposed For Instrumentation

1. BRIDGE NO. 105 IN DUG–DRZ SECTION (5X100’+2X40’ STEEL GIRDER)

2. BRIDGE NO 154 UP IN JSG-KDTR SECTION

(4X20’ ARCH + 1X100’ STEEL GIRDER)

3. BRIDGE NO.91 K IN CHULHA–APR SECTION (7X60’ STEEL GIRDER)

4. BRIDGE NO. 175 UP NEAR UMARIA

(2X100’ STEEL GIRDER)

5. BRIDGE NO 34 UP IN KNHN-KP SECTION

(7X150’ + 2X 60’ STEEL GIRDER)


C tendering

(C) TENDERING

SPECIAL LIMITED TENDERS WERE INVITED WITH GM’S APPROVAL

1. FOR BRIDGE NO. 105 IN DUG-DRZ SECTION

A) OPENED ON 24/3/06

B) AWARDED ON 13/04/06 (TO SHARMA ASSOCIATES)

C) TESTING DONE ON 26/05/06 and 17&18 Nov 06

2. FOR OTHER FOUR BRIDGES COMBINED TOGETHER

A) OPENED ON 11/05/06

B) AWARDED ON 30/08/06 (TO SHARMA ASSOCIATES)

C) NUMERICAL MODELING COMPLETED.

D) TESTING ON TWO BRIDGES PLAN FROM 08 Nov, TO 15 Nov, 2006.


Scope of work

SCOPE OF WORK

SCHEDULE INCLUDES

1. TO DEVELOP NUMERICAL MODEL SOFTWARE BASED ON

TYPE OF STRUCTURE

TYPE OF LOADING

TO KNOW THEORETICAL

MAXIMUM STRESSES IN BENDING

MAXIMUM STRESSES IN SHEAR

MAXIMUM DEFLECTION

2. INSTRUMENTATION TO GET

MAXIMUM BENDING STRAIN (AT CENTER OF GIRDER)

BENDING STRAIN AT FIRST CUT OFF POINT

MAXIMUM DEFLECTION (AT CENTER OF GIRDER)

MAXIMUM SHEAR STRESS AT SUPPORT

LONGITUDINAL STRAIN ON BEARING

SETTLEMENT OF PIER

TILT OF PIER cont…


Scope of work cont
SCOPE OF WORKCONT..

  • DATA COLLECTION , RECORDING ,STORAGE AND REPORT SUBMISSION (THIS WILL BE DONE QUARTERLY)

  • RESIDUAL LIFE ANALYSIS

  • DETERMINE REHABILITATION/STRENGTHENING SCHEME. (OPTIONAL)

  • CONT. MONITORING FOR TWO YEARS. (OPTIONAL)


Field work
FIELD WORK

INVOLVES

  • FIXING OF SENSORS.

  • CONNECTION TO DATA ACQUISITION SYSTEM.

  • RUNNING OF TEST TRAIN.

  • COLLECTION & STORAGE OF DATA.

    5. REPORT SUBMISSION

    NOTE :- THE DATA WILL BE PROCESSED FOR PREPARATION OF TECHNICAL REPORT


Strain gauges used for instrumentation

Super Structure

STRAIN GAUGES USED FOR INSTRUMENTATION

CONTINUE



2. FOR VERTICAL FORCE TEST TRAIN WERE RUN AT VARIOUS SPEED

A) 5 KMPH (CONSIDERED AS STATIC LOADING)

B) 15 KMPH

C) 30 KMPH

D) 45 KMPH

E) 60 KMPH

F) 75 KMPH

3. FOR LONGITUDINAL FORCE TEST IS CONDUCTED FOR

A) BREAKING FORCE AND

B) TRACTIVE EFFORT

NOTE:- FOR VERTICAL FORCE, TEST TRAIN WAS COMPRISED OF SINGLE WDG3A LOCO WITH 10 BOBSNM1 WAGON LOADED WITH 100 TON (25 T AXLE LOAD)

FOR LONGITUDINAL FORCE, TEST TRAIN WAS COUPLED 2WDG3A LOCO WITH 48 BOBSNM1 WAGON LOADED WITH 100 TON (25 T AXLE LOAD)


Comparison of Theoretical Stress with numerical modeling and actual stress1.Bending stresses at mid span (In Kg /CM2 )




3 deflection in mm
3. Deflection:- /CM( In mm)



5 deflection of pier

5. Deflection of pier /CM

6. Pier Tilt


Thank you

Thank You /CM

South East Central Railway, Bilaspur (C.G.)

Exit


Pier /CM

Back


Super structure

Super Structure /CM

Back




Collecting data

COLLECTING DATA /CM

Back



Shear gauge

Shear Gauge /CM

Back









Collecting data2

COLLECTING DATA /CM

Back









Gage at cutoff

GAGE AT CUTOFF /CM

Back



Gage on rail

GAGE ON RAIL /CM

Back


DESIGN CHECKING /CM

DUG - DRZ SECTION

DESIGN CRITERION:

(i)Loco: Double headed WDM2.

(ii)Wagons:BOBS wagons with CC+8+2t loading.

(iii)Basic wind pressure =150 kg/m2

(iv)Speed of train=75 Kmph

(v)Dispersion of longitudinal forces to approach is allowed.

(vi)Permissible stresses have been adopted for 10 million cycles.

RESULTS:SUB STRUCTURES:

Substructures have been found safe .

SUPER STRUCTURES:

(i)40’ plate girder confirming to RDSO Drg. No. BA 1056 has been found safe.

(ii)100’ plate girder confirming to RDSO Drg. No. BA 1518 has been found unsafe for above criterion. But it is safe for 50 Kmph speed in 2 million cycles.


KORBA - NKJ, JHARSUGUDA - KIRORIMALNAGAR, DUMRIKHURD - KANHAN SECTIONS

DESIGN CRITERION:-

(i)Loco: Double headed WDM2/Double Headed WAG5/Single Headed WAG7.

(ii)Wagons: 58 Nos. BOXN Wagons Loaded with CC+6+2t for Korba-NKJ& Dumrikhurd - Kanhan routes and with CC+8+2 for Jharsuguda - Kirorimalnagar

(iii)Basic wind pressure = 150 Kg/m2, as stipulated in bridge rules for broad gauge bridges.

(iv)Speed of the train = 60Kmph (Ref: CE/SECR/Bilaspur letter No. Engg/TC-1/ Increase in axle load/1767; dated 03-03-06.)

(v)Dispersion of Longitudinal forces to approaches is allowed.

(vi)Permissible stresses have been adopted for 10 million cycles.


RESULTS KANHAN SECTIONS:

SUB STRUCTURES: Substructures have been found safe .

SUPER STRUCTURES:

(i)40’ plate girders confirming to RDSO Drg. No. BA 1056,BA11003 have been found safe.

(ii)60’ plate girders confirming to RDSO Drg. No. BA 1057,BA11004 CE’s Drg. No. 10291, CE’s Drg. No. 11237 have been found safe.

(iii)80’ plate girders confirming to RDSO Drg. No. BA 1058,

(iv)100’ girders confirming to RDSO Drg. No. BA 1059(Plate Girder) ,BA 6081 (Under Slung Type) have been found safe for 100’ plate girder confirming to RDSO Drg. No. BA 1518 has been found unsafe for above criterion.But it is safe for 50 Kmph speed in 2 million cycles.

(v)150’ open web girders confirming to RDSO Drg. No. BA 5025,BA11101 have been found safe. Cross Girders and Stringers for these girders have also been found safe.

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