Comparative Study And Behavior Of Box Girder Bridges Using Sap2000
DOI:
https://doi.org/10.69980/ajpr.v28i3.570Keywords:
Box girder bridges, SAP2000, Eccentricity, IRC, IRC Class 70R, IRC Class AAbstract
In modern highway system normally box girder bridges are used because they are structurally efficient, cost effective and aesthetically pleasing too. The non-uniform stress distribution of box girder section in transverse and longitudinal direction gives the complex behavior, most of the recent researchers suggested that the FEM method is best suitable for analyzing box girder bridges. According to the Indian Road Congress (IRC) provisions, linear analysis of Rectangular, Circular and Trapezoidal box girders has performed by using finite element analysis software i.e. SAP2000 for Dead Load (Self Weight), IRC Class 70 R loading and IRC Class A live loading for maximum eccentricity case. It has been analyzed that how the box girders behave with uniform depth increments. For different parameters such as longitudinal bending stress, shear stress and deflection. The accuracy of results and validation of work has been checked by comparing SAP2000 results with manual results for all sections of box girders. The comparative study has carried out for parameters like longitudinal and transverse bending stresses, shear stress distribution and deflection in girder. For analysis of box girders effectiveness of four nodded shell element is alsochecked.
References
i) With increase in depth of rectangular, trapezoidal and circular box girders the deflection in all girders decreases with small increment in depth of box girdersection.
ii) The longitudinal, transverse bending stresses and shear stresses values in top flangeand bottom flanges for all the sections also decreases with increase in depth ofgirders.
iii) After comparison of above all section of different shapes i.e. rectangular, trapezoidal and circular cross section the deflection, bending stress and shear stress values are less in rectangular as compared to trapezoidal and circular section and circular section gives the maximum values of deflection and bending stresses amongst allsections
iv) Deflection variation in rectangular and trapezoidal box girders due to IRC class A loading and IRC 70 R loading is very small as compared to the circular section for constant depthcondition
v) From the above study, it can be concluded that the rectangular box girder has more strength and stiffness as compared to circular and trapezoidal box girder under the assumed loadingconditions.
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