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Bridge & Structure

Role of the Directorate

Issue of Standard drawings for Railway Bridges (Steel, Composite, PSC and RCC), Road Over Bridges (Composite and Bow String), Foot Over Bridges, Steel bridge sleepers etc.
Formulation and updation of codes, manuals & guidelines on various aspects related to bridge loading, design, planning, construction etc
Clearance of Design Basis Report of Metros and Non-standard important railway bridges.
Vetting of Speed Certificates for different rolling stocks from bridge point of view for facilitating trials and operation of new rolling stocks.
Development & adoption of new technology for bridges on Indian Railways is done for induction of new technology.
Registration of vendors for Steel girder fabrication, elastomeric bearings, POT-PTFE bearings, expansion joints and HSFG bolting assemblies is done for quality assurance during fabrication of bridges.
Fabrication inspection of newly fabricated steel bridge girders where RDSO is engaged as an inspecting agency by Zonal Railways is done to ensure quality fabrication of these steel girders.
Rail Structure Interaction (RSI) analysis for ballasted deck bridges for Zonal Railways for continuation of LWR/CWR over such bridges.
NDT Testing and instrumentation is conducted on bridges referred by Zonal Railways.
Bridge and Structures Standard Committee Meetings are conducted for discussion and finalization of various technical issues related to bridges over Indian Railways.
Development of new loading standards and dealing issues related to floods. Bridge related Consultancy services to Zonal Railways are also one of the major task.

Organizational Chart

Brief Achievements of the Directorate during last one year and current year

Design & drawing of Road Over Bridge Truss Steel Girder of 102m clear span for NHAI three lane one way and two lane one way (with special class loading of 385 ton) for seismic zone – V and Wind Zone- VI issued.
Checking of suitability of existing RDSO standard ROB drawings of 18m, 24m, 30m and 36m for skew angle > 20° and upto 30°.
Vetting of 258 speed certificates and 67 Nos. trail reports of different types of rolling stocks from bridge point of view.
Approval of 56 vendors of Steel Bridge Girder, Elastomeric Bearing, POT-PTFE Bearing, Expansion Joints and HSFG bolts.
“Guidelines of approval of Design Basis Report for Important Bridges (Revision-1)” Report No. BS-122 (R1), has been revised and issued to Zonal Railway.
Compendium work for RCC Box RUBs completed. This will help field engineers in planning, designing & executing of RUBs over Indian Railways.
Technical approval of instrumentation schemes for 20 Nos. bridges (1 of NER, 14 of CR, 4 of ECR and 1 of SECR).
A supplement to Guidelines on water logging and drainage problem in RUBs/Subways sent to Railway Board.
The design and drawings of 6m wide FOB for span 25m to 30m with main girder as composite girders, tubular sections for columns and roofing arrangements and dog legged ramps were issued.
Drawings of 60m, 54m, 48m & 42m clear span for NHAI two lane one way (four lane), bow string girder has been revised due to revision in IRC SP:84 and issued (RDSO/B-10434 to 10434/11),( RDSO/B-10435 to 10435/11), (RDSO/B-10436 to 10436/11) and (RDSO/B-10437 to 10437/11).
Revision of RDSO standard ROB drawings of 18, 24m, 30 m & 36m for revised deck widths as per latest IRC specification
Drawing of 45.7m OWG has been revised due to issue of Bending of BLB Gusset plate above Bearing at (L0) location in Drg. No. RDSO/B-17181/9 and issued to all zonal railways.
Drawing of 91.4m OWG has been revised to accommodate spherical bearing and issued vide Drg. No. RDSO/B-17184/9.
Guidelines for the Use of High Performance Concrete in Bridges have been revised (BS-89R).
A&C slip No. 50 to IRS Bridge Rules (Third Repint-2014) on accidental impact loads has been issued in Dec. 2022.
A&C Slip No. 51 to IRS Bridge Rules (Third Reprint-2014) regarding modification to Sub Clause (b), (d), & (g) of Clause 2.8.2.4.3 related with ballastless track (BLT) bridges has been issued.
Standard design and drawings of RCC (M-35) Abutments of height 4m and more than 4m & up to 6m for span 12.2m Post Tensioned PSC slab (4units) for severe environment exposure condition conforming to 25t Loading-2008 for seismic zone V have been issued to Zonal Railways.
New Design and drawing of 12.2m PSC 2I-Girder for 25t loading with provision of footpath issued.
Standard Quality Assurance Plan (QAP) for Elastomeric Bearing, POT-PTFE Bearing and Expansion Joint has been issued in Feb.2023.
K.C.Sood Memorial Award has been conferred to Sh. B.P.Awasthi, PED (Infra-II) and team for third best technical paper presented during International Technical Seminar held at Udaipur on “Suitability of Existing Railway Bridges for higher speed and higher axle land over Indian Railway Network”.
A Technical Paper on “Challenges in performance of existing railway bridge infrastructure for traffic regime of higher speed and heavier axle loads” has been presented by Sh. B.P.Awasthi, PED (Infra-II) and team, in International Technical Seminar held at Kolkata on 24th & 25th February, 2023.
Standard design of RCC (M-35) Abutments of height 4m and more than 4m & up to 6m for span 12.2m Post Tensioned PSC slab (4units) for severe environment exposure condition conforming to 25t Loading-2008 for seismic zones II, III & IV.
Standard design of 12m width FOB for span 25 to 30m for Amrit Bharat Station Scheme & 1 in 8 ramp were issued.
Standard design of V shaped columns and 1 in 8 straight ramp for 12m FOB were issued.
Revision of Plate Girder Drawings of Railway Bridges as per IRS Seismic Code, Revised (2020).
Guidelines for suitability of existing bridges (Composite/RCC/PSC Super-Structure) designed to BGML,RBG and MBG-1987 loading for running 25t loading-2008 at 100kmph on DFC Feeder Routes and 25t identified routes issued.
Revised drawings RDSO/B-10275R series and drawing RDSO/B-10275/4 (ALT.-1) of elastomeric bearing for 12.2 m post tensioned U girder for 25t 2008 loading issued.
Drawing of Signal Gantry for four tracks issued.
Standard Drawing of RCC Box Pushing using Protection Plate Arrangement RDSO/B-10161 & RDSO/B-10161/1 issued.
Revised Design/Drawings series for 18.3m span PSC U Girder (Post Tensioned) of 25t 2008 loading issued.

Current Assignment in hand

Standardization of design of drawings of 1 span of Open Web Girders with ballasted deck for 25-t loading with its suitability for passenger train operation upto 220kmph.
Research Project with CSIR-SERC on “Evaluation and management of longitudinal forces on substructure of Railway Bridges”
Upgradation of B&S Lab.
Detailed checking of all standard drawings of Concrete girders including bearings /slabs for 25t loading.
Dynamic analysis and evaluation of existing RDSO standard bridge superstructures for various axle load and speed configurations.
Preparation of Appreciation Report for field trials of Continuous Scour Monitoring of Bridge Foundation.
TAG on Vasai Creek Bridge of WR.
Guideline for pipe-pushing by micro-tunneling.
RCC Boxes of Dedicated Test Track at NWR.
Issue of draft A&C slip no 10 of IRS Bridge Substructures and Foundation Code.
Review of Manual on Design and Construction of Well and Pile Foundation.
Revision of RDSO Standard Bow string girder ROB drawings of 72m clear span for NHAI two lane one way (four lane) revised deck widths as per latest IRC specifications.
TAG on Manjhi Bridge (Bridge No. 16) of NER
Revision of RDSO standard design of PSC ‘U’ slab/girder.

Source : WELCOME TO RDSO CMS Team Last Reviewed on: 25-08-2023