RC box culvert Project Presentation.pptx

BOX CULVERT ANALYSIS

1. “ COMPARITIVE ANALYSIS OF 4 LANE RC SLAB CULVERT BRIDGE USING INDIAN, AMERICAN AND EURO CODES ” Presented by Guided by

2. CONTENT Introduction Objectives GENERAL PROBLEM STATEMENT for ANALYSIS MODELLING Results Conclusion References

3. 1. INTRODUCTION What is a culvert? Culvert is a hydraulic structure that allows water to flow under a road, railroad, trail, or similar obstruction from one side to another side. A culvert may be a bridge like structure designed to allow vehicle or pedestrian traffic to cross over the waterway while allowing adequate passage for the water. The structural analysis involves consideration of load cases, live load, effective width, load dispersion through fill, impact factor, coefficient of earth factor. They are suitable for difficult site conditions, require minimum maintenance and have a prolonged service life.

4. INTRODUCTION What is a BOX CULVER T? It is a monolithically cast, rigid framestructure suitable for non perennial streams where the soil is weak. The bottom slab reduces the pressure on the ground below, Therefore a separate foundation is not required making them economical. Even though box culverts are easy to install, a dry surface is needed for installation.

5. 2 . OBJECTIVES Analyse 4 lane reinforced concrete slab culvert bridge by Indian(IRC), American(AASTHO) and EURO codes having same material and geometric configuration. Generate results for max and min vertical reactions, bending moments on the culvert slab, displacements of the slab in the direction of vehicular load and displacement contour. Comparison of the results obtained by IRC, AASTHO and EURO codes for most critical load combinations. Conclusion obtained from the comparison of analysis results.

6. Span length : 8 m Depth of the slab : 700 mm Transverse width of the slab : 16 m Number of lanes considered : 4 Width of one lane   4m Width of crash barrier and footpath : 450mm and 1000mm on both sides. Material considered : M 3 0 grade( for Indian code) Material considered : ASTM RC grade 4500(American code) Material considered :   C25/30 grade( EUROCODE)     3. GENERAL PROBLEM STATEMENT for ANALYSIS

7. 4.MODELLING 4.1) BY IRC 6 and IRC 112( most critical) Vertical reaction Displacement contour

8. Max Sagging and Hogging bending moment

9. 4.2) By AASTHO LRFD(2007) CODE( most critical) Vertical reaction

10. Displacement contour

11. Max Sagging and Hogging bending moment

12. 4.3) By EUROCODE EN 1991-2:2003 CODE( most critical) Vertical reaction

13. Displacement contour

14. Max Sagging and Hogging bending moment

15. 5.Results Code Vertical reaction max(kN) Vertical reaction min(kN) Max vertical displacement(mm) Max +ve BM Max -ve BM IRC 1357.7 434.4 3 .35 442.31 481.74 AASTHO 1393.5 287.5 1.38 188.9 311.56 EURO 1229.287 266.43 1.35 213 286.1 1. T he values of maximum forces, displacements and bending moment are as follows:

16. 2 . Critical combination of vehicles and loads for max values Code Vehicle combination IRC 2 vehicles of class 70 R, one in lane 1,2 and one in lane 3,4 AASTHO Design truck HL93 + Design lane load on all 4 lanes EURO Code Load Model 3 Special vehicle SV 100 on all 4 lanes

17. 6. Conclusion Maximum displacement by IRC is 2.43 times of that obtained by AASTHO code and 2.48 times of th at obtained by EURO code. Maximum sagging moment by IRC is 2.34 times of that obtained by AASTHO code and 2.07 times of th at obtained by EURO code. Maximum hogging moment by IRC is 1.54 times of that obtained by AASTHO code and 1.68 times of that obtained by EURO code. Hence for the nearly identical material configuration and geometric properties, we obtain higher displacements and Bending moments in IRC code as compared to AASTHO and EURO CODE for their respective vehicle load configurations.

18. References : IRC:6-2017, “Standard specifications and code of practice for road bridges (Section: II)”, Loads and Load Combinations, Indian Road Congress, New Delhi. IRC:112-2020, “Code of practice for concrete road bridges”, Indian Road Congress, New Delhi Standards specifications for Highway bridges adopted by The American Association of State Highway officials, ELEVENTH EDITION 1973. AASTHO LRFD Bridge Design Specifications 4th edition 2007 Bridge design practice3, California Department of transportation 2022. EUROCODE Handbook 4, Design of Bridges. EUROCODE EN 1991-1:2003

19. Thank you