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Parametric Study on Behavior 0f Box-Girder Bridges Using Finite Element Method
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 01 | Jan-2016 www.irjet.net p-ISSN: 2395-0072 _______________________________________________________________________________________ © 2016, IRJET ISO 9001:2008 Certified Journal Page 211 Parametric Study on Behavior 0f Box-Girder Bridges Using Finite Element Method Rajendra Thakai1, Raghunath Deshpande2, Shantinath Bedkihal3 1 Rajendra J.Thakai Asst.Professor,Civil Engineering Department,KLS Gogte Institute of Tech.,Karnataka,India. 2 Raghunath Deshpande Asst.Professor,Civil Engineering Department,KLS Gogte Institute of Tech.,Karnataka,India 3Shantinath Bedkihal M.Tech. Student, Civil Engineering Department,KLS Gogte Institute of Tech.,Karnataka,India. Abstract Box girders, have gained wide acceptance in freeway and bridge systems due to their structural efficiency, better stability, serviceability, economy of construction and pleasing aesthetics. Analysis and design of box-girder bridges are very complex because of its three-dimensional behavior consisting of torsion, distortion and bending in longitudinal and transverse directions. The longitudinal bending stress distribution in wide flange girder is distributed non-uniformity throughout the width. It remains maximum at the edge and reduces towards the center and usually cannot be obtained accurately from elementary beam theory. To study of box-girder bridge namely rectangular and trapezoidal cross-section has been carried out in the present work. Commercially available SAP 2000 software is used for the finite element analysis of these box-girders. The box girder are analyzed for load combination of Dead Load (Self weight) and Live load of IRC 70R loading for zero eccentricity (centrally placed) for simply supported span and continuous span. The study has been carried out for Bending moment and Longitudinal bending stress in top and bottom flange along the span for these cross-sections. Key Words: box-girder, complex structural systems, ductility characteristics., --------------------------------------------------------------------***--------------------------------------------------------------------- 1. GENERAL Nowadays, single or multi cell reinforced and prestressed concrete box girder bridge have been widely used economic and aesthetic solutions for overcrossing, undercrossing, separation structure and viaducts found in today’s modern highway systems. The main advantage of these types of bridges lies in the high torsional rigidity available because of the closed box section and convenience in varying the depth along the span. High torsional stiffness gives stability and load distribution characteristics and also makes this form particularly suited for Grade Separation, where the alignment of bridges are normally curved in plan. Also the hallow section may be used to accommodate services such as water mains, telephones, electric, cables, sewage pipes etc. and the section has an added advantage of being light. 1.1 Procedure for Modeling In the current study, SAP2000/Bridge software is utilized to create 3D models and carry out all the analysis. Design allows for quick and easy design and retrofitting of steel and concrete bridges. The parametric modeler allows the user to build simple or complex bridge models and to make changes efficiently while maintaining total control over the design process. Lanes and vehicles can be defined quickly and include width effects. Simple and practical Gantt charts are available to simulate modeling of construction sequences and scheduling. The SAP2000/Bridge module runs within the SAP2000 Plus or Advanced versions of SAP2000. It includes an easy to follow Wizard that outlines the steps necessary to create a bridge model 1.2 Assumptions made in the analysis i. The flange (top and bottom) and web are monolithic in nature. ii. All materials are elastic and homogeneous. iii. The vehicle load considered for analysis purpose is Class 70 R loading. This is the highest loading in IRC loading. iv. It is also presumed that the thickness of slab is not varied. v. Unless otherwise specified, the finite element method is adopted to analyze bridge behavior. 1.3 Dead loads For the purpose of dead load calculation self weight is considered. Self weight is calculated from the cross sectional properties of girder. 1.4 Vehicle loading details
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 01 | Jan-2016 www.irjet.net p-ISSN: 2395-0072 _______________________________________________________________________________________ © 2016, IRJET ISO 9001:2008 Certified Journal Page 212 All vehicles used in the study are Class 70 R wheeled vehicle with seven axles, specified in the IRC. The distance between the interior face of the barrier to the outer most line of wheels of the first vehicle was varied from 150 mm to 1200 mm. In the standard load configuration, the vehicle was spaced 1200 mm apart. The live load placement configurations are shown in fig. 1. Fig. 1: IRC class Wheeled Vehicle loading in longitudinal direction The vehicle has seven axles. The distance between the each axle and load carried by each wheel is shown in figure below. The front and rear clearance for the vehicle is 90310 mm and the vehicle width is 2.72 m. 2. BOX GIRDER DETAILS In the present work two different cross-sections namely Rectangular and Trapezoidal section of the Single-cell Box-Girder Bridges are analyzed. The details of the cross-sections are given in Fig. 2a , 2b and Table 1. Fig.2a: Single-cell Rectangular cross-section of Box Girder Bridge Fig.2b: Single-cell Trapezoidal cross-section of Box Girder Bridge Ttf, Tbf and Tw are 0.3 m and same for all cross-sections. All dimensions are in meter. Table- 1: Geometries of bridges used in parametric study Depth Rectangular Trapezoidal D A B C A B C 2.0 2.4 4.8 4.8 1.8 6.0 4.6 2.4 2.4 4.8 4.8 1.8 6.0 4.7 2.8 2.4 4.8 4.8 1.7 6.2 4.6 The analysis of the bridge was done taking into consideration same width of the bridge deck with same area of cross-section and a span of 20.0 m and 40.0 m for all types of cross sections. A constant thickness of 0.3 m was assumed throughout the bridge cross section with varying depth parameter. Linear analysis was performed for dead load (Self Weight) and I.R.C live load Class 70R loading for both the cross-sections of the bridge. The loads are placed in accordance with IRC: 6- 2000. The results and graphs are obtained by using SAP- 2000 software. 3. PROCEDURE FOR THE ANALYSIS Fig. 3: New Model form
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 01 | Jan-2016 www.irjet.net p-ISSN: 2395-0072 _______________________________________________________________________________________ © 2016, IRJET ISO 9001:2008 Certified Journal Page 213 Fig. 4: SAP2000/Bridge Wizard Fig. 5: Bridge deck section Fig. 6: Specify deck section properties Fig. 7: 3D view of bridge model and lanes Fig. 8: IRC 70 R Vehicle Data form Fig. 9: Showing the analysis
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 01 | Jan-2016 www.irjet.net p-ISSN: 2395-0072 _______________________________________________________________________________________ © 2016, IRJET ISO 9001:2008 Certified Journal Page 214 Fig. 10: Graphical Results Fig. 11: Bridge Object Response Display 4. RESULTS 4.1 Span 20 m (simply supported span) Table- 2: Maximum Bending Moment for Single-Cell Rectangular Box-Girder Bridge Dept h (m) Rectangular box-girder (KN- m) Increase Percentage in Bending Moment 2.0 6185.31 --- 2.4 6468.07 4.57 2.8 6750.83 9.14 Table- 3: Maximum Longitudinal Bending Stress in Top Flange along the span for Single-Cell Rectangular Box-Girder Bridge Dept h (m) Rectangular box-girder (KN/m2) Decrease Percentage in stress 2.0 1572.46 --- 2.4 1276.01 18.85 2.8 1082.53 31.15 Table- 4: Maximum Longitudinal Bending Stress in Bottom Flange along the span for Single-Cell Rectangular Box-Girder Bridge Dept h (m) Rectangular box-girder (KN/m2) Decrease Percentage in stress 2.0 2550.46 --- 2.4 2052.72 19.51 2.8 1721.83 32.48 Table- 5: Maximum Bending Moment for Single-Cell Trapezoidal Box-Girder Bridge Dept h (m) Trapezoidal box-girder (KN- m) Increase Percentage in Bending Moment 2.0 6397.38 --- 2.4 6680.14 4.41 2.8 6962.90 8.83 Table- 6: Maximum Longitudinal Bending Stress in Top Flange along the span for Single-Cell Trapezoidal Box-Girder Bridge Dept h (m) Trapezoidal box-girder (KN/m2) Decrease Percentage in stress 2.0 1592.54 --- 2.4 1292.17 18.86 2.8 1095.65 31.20 Table- 7: Maximum Longitudinal Bending Stress in Bottom Flange along the span for Single-Cell Trapezoidal Box-Girder Bridge Dept h (m) Trapezoidal box-girder (KN/m2) Decrease Percentage in stress 2.0 2376.88 --- 2.4 1919.03 19.26 2.8 1614.19 32.08 4.2 Span 40 m (continuous span) Table- 8: Maximum Bending Moment for Single-Cell Rectangular Box-Girder Bridge Depth (m) Rectangular box- girder (KN-m) Increase Percentage in BM + ve BM - ve BM + ve BM - ve BM 2.0 5698.38 3658.55 --- --- 2.4 5835.65 3875.09 2.40 5.91 2.8 5933.73 4107.31 4.13 12.26 Table- 9: Maximum Longitudinal Bending Stress in Top Flange along the span for Single-Cell Rectangular Box-Girder Bridge
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 01 | Jan-2016 www.irjet.net p-ISSN: 2395-0072 _______________________________________________________________________________________ © 2016, IRJET ISO 9001:2008 Certified Journal Page 215 Depth (m) Rectangular box- girder (KN/m2) Decrease Percentage in stress + ve BM - ve BM + ve BM - ve BM 2.0 1448.67 930.09 --- --- 2.4 1151.25 764.47 20.53 17.80 2.8 951.50 658.63 34.31 29.18 Table- 10: Maximum Longitudinal Bending Stress in Bottom Flange along the span for Single-Cell Rectangular Box-Girder Bridge Depth (m) Rectangular box- girder (KN/m2) Decrease Percentage in stress + ve BM - ve BM + ve BM - ve BM 2.0 2349.67 1508.56 --- --- 2.4 1852.01 1229.80 21.17 18.47 2.8 1513.42 1047.58 35.59 30.55 Table- 11: Maximum Bending Moment for Single-Cell Trapezoidal Box-Girder Bridge Depth (m) Trapezoidal box- girder (KN-m) Increase Percentage in BM + ve BM - ve BM + ve BM - ve BM 2.0 5556.18 3511.84 --- --- 2.4 5939.89 4036.98 6.90 14.95 2.8 6023.56 4274.96 8.41 21.72 Table- 12: Maximum Longitudinal Bending Stress in Top Flange along the span for Single-Cell Trapezoidal Box-Girder Bridge Depth (m) Trapezoidal box- girder (KN/m2) Decrease Percentage in stress + ve BM - ve BM + ve BM - ve BM 2.0 1443.96 912.67 --- --- 2.4 1148.98 780.89 20.42 14.43 2.8 947.84 672.69 34.35 26.29 Table- 13: Maximum Longitudinal Bending Stress in Bottom Flange along the span for Single-Cell Trapezoidal Box-Girder Bridge Depth (m) Trapezoidal box- girder (KN/m2) Decrease Percentage in stress + ve BM - ve BM + ve BM - ve BM 2.0 2528.88 1598.40 --- --- 2.4 1706.38 1159.72 32.52 27.44 2.8 1396.42 991.05 44.81 37.99 Fig. 12: Variation of Maximum Bending Moment for Single-Cell Rectangular Box-Girder Bridge Fig. 13: Variation of Maximum Longitudinal Bending Stress in Top Flange along the span for Single-Cell Rectangular Box-Girder Bridge Fig. 14: Variation of Maximum Longitudinal Bending Stress in Bottom Flange along the span for Single-Cell Rectangular Box-Girder Bridge
6.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 01 | Jan-2016 www.irjet.net p-ISSN: 2395-0072 _______________________________________________________________________________________ © 2016, IRJET ISO 9001:2008 Certified Journal Page 216 Fig. 15: Variation of Maximum Bending Moment for Single-Cell Trapezoidal Box- Girder Bridge Fig. 16: Variation of Maximum Longitudinal Bending Stress in Top Flange along the span for Single-Cell Trapezoidal Box-Girder Bridge Fig. 17: Variation of Maximum Longitudinal Bending Stress in Bottom Flange along the span for Single-Cell Trapezoidal Box-Girder Bridge Fig. 18: Variation of Maximum Bending Moment for Single-Cell Rectangular Box-Girder Bridge Fig. 19: Variation of Maximum Longitudinal Bending Stress in Top Flange along the span for Single-Cell Rectangular Box-Girder Bridge Fig. 20: Variation of Maximum Longitudinal Bending Stress in Bottom Flange alongthe span for Single-Cell Rectangular Box-Girder Bridge Fig. 21: Variation of Maximum Bending Moment for Single-Cell Trapezoidal Box- Girder Bridge
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 01 | Jan-2016 www.irjet.net p-ISSN: 2395-0072 _______________________________________________________________________________________ © 2016, IRJET ISO 9001:2008 Certified Journal Page 217 Fig. 22: Variation of Maximum Longitudinal Bending Stress in Top Flange along the span for Single-Cell Trapezoidal Box-Girder Bridge Fig. 23: Variation of Maximum Longitudinal Bending Stress in Bottom Flange along the span for Single-Cell Trapezoidal Box-Girder Bridge 5. CONCLUSION An extensive parametric study was conducted on behavior of box-girder bridges analyzed using finite element model. Based on this study the following conclusions were made: i. As the depth of box-girder Increases the Bending moment also increases. ii. As the depth of box-girder Increase the longitudinal bending stress in top flange and bottom flange along the span decreases. iii. Among rectangular and trapezoidal cross section box girders for all depths, the bending moment is highest in trapezoidal girder under the load combination of dead load and live load (centrally) and least in rectangular girder. Therefore it can be concluded that the rectangular section is the stiffest section among these two sections. REFERENCES [1] Cem Topkaya, Eric B. Williamson Karl H. Frank, “Behaviour of curved steel trapezoidal box-girders during construction”. Engineering Structures 26 (2004) 721– 733 [2] IRC: 6-2000, Standard Specifications and Code of Practice for Road Bridges, Section II, Loads and Stresses, The Indian Roads Congress, 2000. [3] IRC: 21-2000, Standard Specifications and Code of Practice for Road Bridges, Section III, Cement Concrete (Plain and Reinforced), The Indian Roads Congress, 2000. [4] John B. Kennedy, Magdy Samnna, Khaled M. Sennah, “Dynamic analysis of curved continuous multiple-box girder bridges”. ASCE (Journal of Bridge Engineering) vol-12, 2007, pp-184-193 [5] Kenneth W. Shushkewich, “Approximate Analysis of Concrete Box Girder Bridges”. ASCE (Journal of Structural Engineering), July 1988. [6] Khaled M. Sennah, John B. Kennedy, “Literature Review in Analysis of Box- Girder Bridges”. ASCE (Journal of Bridge Engineering), March/April 2002. [7] Manoj Kumar, “Influence of box-geometry on shear lag in RC box-girder bridges”. The Indian Concrete Journal, vol-84, January 2010. [8] Shreedhar R., Spurti Mamadapur, “Analysis of T- beam Bridge using Finite Element Method", International Journal of Engineering and Innovative Technology (IJEIT) - (ISSN 2277-3754), Volume 2, Issue 3, September 2012, pp 340-346. [9] Sujata Shreedhar, Shreedhar R., “Design Coefficients for Three Cell Box Culvert ” , Global Journal of Researches in Engineering -(ISSN 0975- 5861), Volume 13, Issue 6, Version 1.0, Year 2013, pp 25-36. [10]Sujata Shreedhar, Shreedhar R., “Design Coefficients for Single and Two Cell Box Culvert ”, International Journal of Civil and Structural Engineering - (ISSN 0976 – 4399), Volume 3, Issue 3, March 2013, pp 475-494, doi:10.6088/ijcser.201203013044
8.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 01 | Jan-2016 www.irjet.net p-ISSN: 2395-0072 _______________________________________________________________________________________ © 2016, IRJET ISO 9001:2008 Certified Journal Page 218 BIOGRAPHIES Rajendra J.Thakai Assistant Professor, Civil Engineering Department, Gogte Institute of Technology Belagavi, Karnataka, India. Email:.rjthakai@git.edu Raghunath .D. Deshpande Assistant Professor, Civil Engineering Department, Gogte Institute of Technology Belagavi, Karnataka, India. Email:rddeshpande@git.edu. Shantinath Bedkihal M.Tech. Student, Civil Engineering Department, Gogte Institute of Tech.,Karnataka,India. Email: shantinath04@gmail.com
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