Dhubri-Phulbari Bridge Project Overview
The Dhubri-Phulbari Bridge project aims to connect Dhubri town in Assam and Phulbari town in Meghalaya, reducing travel time and distance significantly. The project involves the construction of a four-lane bridge with navigational requirements meeting IWAI guidelines. Various bridge design options such as Through Type Truss Bridge, Bowstring Arch Bridge, Cable Stayed Bridge, Segmental Balanced Cantilever Bridge, and Extradosed Bridge are considered, each with different costs and construction times. Images and details of the project's genesis and form are provided.
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Presentation Transcript
Dhubri - Phulbari Bridge: Genesis of Bridge Form Neil Banerjee
Project Details This bridge is connecting Dhubri town in Assam & Phulbari town in Meghalaya. The bridge is a part of NH-127B. Four lane bridge having main navigational span of 12.625km with viaduct of 5.735 km. Reduction of Travel time by 6 hours & travel distance from 210km to 20km. 2 Genesis of Selection of Bridge Form
Navigational Requirements (IWAI guidelines) 10 meter vertical clearance above High Flood Level (HFL) 100 meter horizontal clearance between piers Pictures of Brahmaputra River at Bridge Location 3 Genesis of Selection of Bridge Form
Option - 1: Through Type Truss Bridge for Navigational Span Single span arrangement Span Arrangement 37,500 Million Cost (Approx.) 8 years Construction Time (Approx.) Cross Section of Bridge Option FRL 4 Genesis of Selection of Bridge Form
Option - 2: Bowstring Arch Bridge for Navigational Span Single span arrangement Span Arrangement 99,500 Million Cost (Approx.) 6.5 years Construction Time (Approx.) Similar Bridge Form: Sydney Harbour Bridge Cross Section of Bridge Option FRL 5 Genesis of Selection of Bridge Form
Option - 3: Cable Stayed Bridge for Navigational Span Single span arrangement Span Arrangement 1,60,000 Million Cost (Approx.) 6.5 years Construction Time (Approx.) Similar Bridge Form: Charles W. Cullen Bridge Cross Section of Bridge Option FRL 6 Genesis of Selection of Bridge Form
Option - 4: Segmental Balanced Cantilever Bridge for Navigational Span 4 Span continuous Span Arrangement 23,000 Million Cost (Approx.) 7.5 years Construction Time (Approx.) Similar Bridge Form: Sir Leo Hielscher Bridge Cross Section of Bridge Option FRL FRL 7 Genesis of Selection of Bridge Form
Option - 5: Extradosed Bridge for Navigational Span 4 Span continuous Span Arrangement 22,500 Million Cost (Approx.) 7.5 years Construction Time (Approx.) Similar Bridge Form: Pearl Harbor Memorial Bridge Cross Section of Bridge Option FRL 8 Genesis of Selection of Bridge Form
Decision Matrix Complexity of Construction Construction Time Sl No Bridge Type Cost Maintenance Aesthetic 1 Truss Bridge High Moderate High Moderate Moderate 2 Bowstring Arch Bridge High Moderate High Moderate Complex 3 Cable Stayed Bridge High Moderate Moderate Excellent Complex Segmental Balanced Cantilever Bridge 4 Economic Moderate Low Poor Easy Most Economic 5 Extradosed Bridge Moderate Moderate Excellent Moderate 9 Genesis of Selection of Bridge Form
Conclusion As per the above study, an Extradosed bridge option is proposed based on the following points: 1. Aesthetics 2. Engineering Aspects Flexible structure preferable in high seismic zone Low fatigue than Cable stayed bridge etc. 3. Accessibility during Construction 4. Serviceability & adaptation to future requirements Can increase the load carrying capacity 5. Cost of Construction 10 Genesis of Selection of Bridge Form
Animated View of Dhubri - Phulbari Bridge 11 Genesis of Selection of Bridge Form
