bridges & structures

www.rdso.indianrailways.gov.in

Annual Report 2010-2011

BRIDGES & STRUCTURES

RESEARCH, DESIGN & DEVELOPMENT

HeavyAxle Load Operation

Codes, Manual & Specifications

DEVELOPMENT OF STANDARD DESIGNS

Standard Designs of Steel Bridge Girders

OTHER DESIGNS

STANDARD DESIGNS OF CONCRETE

BRIDGES

Concrete Bridge Code

A&C Slip No. 13

Bridge Manual

A&C Slip No. 21

A&C Slip No. 22

Manual on the Design and construction of Well and

Pile Foundations

A&C Slip No. 2

Plate Girder for 25t Loading

Composite Girder for 25t Loading

Plate Girder for DFC Loading (32.5t axle load)

Open Web Girder for DFC Loading (32.5t axle load)

RCC Slabs

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BS 106 i.e. Broad Guidelines issued to zonal railways

for instrumentation of bridges for running of higher axle

loads. RDSO was also associated with Zonal Railways

for Instrumentation of Bridges to assess the actual

loadings on the bridges and to access the capacity of

bridges to carry Heavy Axle Loading. In this connection,

fourth consolidated report for instrumentation of Indian

Railways were issued in July, 2010 as BS 108

revising load factors and

specifying coefficient of friction in calculation of

pre stressing loss due to friction has been issued

on 25 11.2010 based on recommendations of

BTDG and 79 BSC.

has been issued on 02-07-2010

regarding underwater inspection.

regarding PSC assessment of

loss of camber has been issued on 28-03-2011.

regarding allowable bearing

pressure for well foundation has been issued on

09.03.2010.

Design and drawings of 12.2m, 18.3m & 24.4m steel

plate girder welded type for 10 million cycles

Design and drawings of composite plate girder for

12.2m, 18.3m, 24.4m and 30.5m spans for 10 million

cycles

Design and drawings of 12.2m, 18.3m & 24.4m steel

plate girder welded type for 10 million cycles.

Design and drawings of welded type open web girder for

30.5m & 45.7m for 10 million cycles for “DFC loading

(32.5t axle load)”.

Design and drawing of Man Refuge on open web

girder for safety of work man.

Design of alternative elastomeric bearing for

24.4m plate girder for 25t loading.

Channel sleeper for DFC Loading.

Modified drawings for H. Beam sleeper suitable

for all Loadings including DFC Loading.

Standard design of 18m, 24m, 30m & 36m span

composite girder ROB have been issued.

Design and drawings of RCC slab for spans of

0.6m, 0.9m, 1.22m, 1.88m and 2.44m for “25t-

loading 2008”.

Design and drawings of RCC slab for spans of

0.6m, 0.9m, 1.22m, 1.88m and 2.44m for “DFC

Loading (32.5t axle load)”.

Standard design of composite girder ROBs

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Design and drawing of RCC slab for composite girder

of span 12.2m, 18.3m and 24.4m for 25t – 2008

loading.

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PSC Slabs

Sub Structure

RCC Box Culverts

Inspection and Testing

Oscillation trial and speed certificate of various

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Checking of Suitability of Existing BGML,RBG and MBG Designs for 25t – 2008loading

Consultancy / Proof checking WorksDesign & drawing of 9.15 m and 12.2 m post-tensionedPSC slab for “25t loading – 2008”.

Design and drawing of Mass concrete Pier andAbutment (M-25) for 6.1m & 9.15m spans forPSC slabs for “25t loading – 2008”.

Design and drawing of Mass concrete Pier andAbutment (M-25) for 12.2 m 2 I girders for “25tloading – 2008”.

Design and drawing of Mass concrete Pier andAbutment (M-25) for 12.2 m composite girder for“25t loading – 2008”.

Design and drawing of Mass concrete Pier andAbutment (M-25) for 12.2 m composite girder for“25t loading – 2008”.

Design and drawing of Mass concrete Pier andAbutment (M-25) for 6.1m & 9.15m spans forPSC slabs for “DFC loading (32.5t axle load)”

Design and drawing of RCC Box Culvert forvarious span height combinations and earth fillheights up to 5.0 m for “25 t – 2008 loading”.

Design and drawing of RCC Box Culvert forvarious span height combinations and earth fillheights up to 10.0 m for “DFC loading (32.5t axleload)”.

General arrangement drawing for limited heightsubway using segmental boxes.

Plate girder (BGML and RBG) of 12.2m, 18.3mand 24.4m spans.

Open web girder (BGML) of 30.5m span.

Plate girders (MBG loading – 4 x 10 cycles and10 cycles) of 12.2m, 18.3m and 24.4m span.

Plate girders (HM loading) of 18.3m and 24.4mspan.

RCC slabs (MBG and RBG loading) 0.61m,0.915m, 1.22m, 1.83m and 2.44 span.

RCC single box and twin box (MBG loading) forvarious combinations of height and spans up to6m and fill depth up to 10m.

NP – 4 class RCC Hume pipe of 300mm, 600mm,900mm, 1000mm, 1200mm and 1800mmdiameter.

Post tensioned PSC 2- girders (MBG loading) of12.2m and 18.3m span.

Post tensioned PSC box girder (MBG loading) of24.4m span.

Consultancy was provided to E.C.Railway foraddressing failure of cross girder of Rail-cum Roadbridge on river Ganga near Mokama.

B&S Directorate is having a well furnished laboratorywith following facilities:

Impact & Static Testing Facility for full scalesleepers.

Concrete Core Cutting Machine.

NDT Testing of Concrete Bridges with CorrosionAnalyser, Profometer, Rebound Hammer, CAPOTest & Lock Test, WINDSOR Probe etc.

Testing of Steel Bridges by Acoustic EmissionTechnique

Residual LifeAssessment of Steel Bridges.

Testing of Brick & Stone Masonry by FLAT JackMethod.

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Bridges & Structures

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rolling stocks

Condition Assessment of Bridges Using VibrationSignatureAnalysis (Approx. Cost: 1,04,00,000)

Development of guidelines for seismic design ofRailway bridges (Approx. Cost : 21, 24,000)

TDC :

Continuous Scour Monitoring of Bridge Pier/Abutment Foundation Using Time DomainReflectometry etc. (Approx. Cost: 1,61,51,000)

RESEARCH PROJECTS COMPLETEDRECENTLY

CURRENT RESEARCH PROJECTS INPROGRESS

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B&S Dte has a major role in issuing the speed certificateand finalizing the oscillation trial reports for all newrolling stock including locomotives. In last one and a halfyear more than 200 speed certificates and more than 40reports for trial of various types of rolling stocks weredealt.

Mathematical models of two bridges have beencreated by which static analysis canbe performed for self weight, dead loads, pre-stressing forces and live loads.

The module can be used to compute naturalfrequencies and mode-shapes.

The analysis of the bridge can also be performed

for moving loads having any number ofpredefined axle loads.

Field measurements indicated that:

Displacement of bridge at a locationcannot be obtained reliably by numericalintegration of acceleration measured

Measured frequencies cannot be used forupdating model reliably due to large spatialvariation and uncertainties in materialproperties

Thus it has been concluded that the traditionalvibration measurements and signature analysistechniques may result in significant errors whenapplied for condition assessment.

The experimental work and analysis of fieldobservations has led to the conclusion that it isnot feasible to deploy this technology forcondition monitoring of concrete bridges atpresent.

In view of above, the project was recommendedfor closure vide RDSO's letter No. RB/1988 dated10.08.2010 summarizing various projectactivities and respective achievements. Theproject has been closed from Mission-22 byRailway Board vide letter No.

dated 18.10.2010.

Training of RDSO officials organized atIIT1Mumbai in Nov.'2010.

The provision of seismic design are very old and afterthe major earthquake of Bhuj, need was felt for re-looking the existing provisions of seismic design for thedesign of new bridges considering the developments inBIS and other international standards.

A project was taken up with IIT/Kanpur The projectstarted in 2007-08 and followed up regularly. Theguidelines have been developed and have beencirculated to zonal railways. Training to RailwayEngineers was given from 2nd to 6th May, 2011.The Project is completed.

December, 2010

This project has been taken up with IIT/Kharagpur withfollowing objectives:

Formulae for estimation of scour depth at BridgePier for alluvial, sand, gravel and layered beds.

Identification of suitable instruments formeasurement of scour depth and monitoring realtime scour in different bed conditions.

Effective and economical protective measures

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Corrosion Analysing Equipment (CANIN)

Pulsator for Sleeper Testing

Resistivity meter, Profometer, Pull off tester, Permeability tester,Ultrasonic Pulse Velocity meter and Corrosion Analyser


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for scour at piers for different bed conditions.

A state of the Art Review Report on Bridge Pier Scourhas been prepared. Laboratory Equipments namelyAcoustic Doppler Profiler and Acoustic DopplerVelocimeter have been procured.

Identification of Bridges for filed investigation and forinstallation of monitoring equipments/ protectivemeasures has been done. Laboratory experimentswere conducted and a report on design formulae forbridge scour based on lab and filed observations hasbeen prepared.

For review of current practices for control and protectivemeasures against scour, visit to University of Aucklandand various sites having control and protectionmeasures under leadership of professor of University ofAuckland who are leading expert in the field wasproposed earlier as pre MOU but not agreed by Board.Board has now directed RDSO to send fresh proposal.University of Auckland has now indicated availability ofslot in May 2011. Accordingly, proposal is beingprocessed. This activity has significant bearing on otheractivities of project.

August, 2013

A lecture by Dr. Prakash Rao on project topic wasdelivered on 16th Extra Ordinary BSC at IRICEN, Pune.

Equipments such as K type thermocouples (150 nos.),Data Logging System, Computer procured.

Literature Survey Report submitted by the PI.

The casting of three RCC Box girder specimens (5mlong) completed & Thermocouples installed.

Data collection by temperature measurements on thebox girder specimens is in progress.

Sanction for procurement of ANSYS software andanemometers obtained. ANSYS software andanemometer have been procured.

FEM Model has been developed onANSYS.

2nd installment of fund Rs. 2.64 lakhs been released toOsmania University. Temperature measurements onunventilated girders with ballast cushion depth of 300mm and 400 mm has commenced.

Sept., 2012

During the year a total of 27,770 MT was clearedagainst annual target of 15,000 MT, which is the highestever inspection done by RDSO.

A one day workshop on “Fatigue Assessment of SteelGirder Bridges – New Fatigue Provisions” wasorganized on 11 June, 2010 by B&S Directorate,RDSO to apprise the Dy.CE/Design, Ex.Engr/Designand Design Assistant about the new provisions as perCorrection Slip No. 18. The workshop was attended by

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legates of various zonal railways.

TDC :

Study of temperature gradient in concrete boxgirder Bridges (Approx. Cost 19,71,500)

TDC :

Inspection of Fabrication of Steel Girders

Workshop on “Fatigue Assessment of Steel GirderBridges – New Fatigue Provisions”


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bridges & structures

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