Abstract
Bridges are the most important component of transportation system of any country due to their ability of accelerating the development of the nation. Design of bridge highly depends on its function, nature of soil strata where it is constructed and the material used to construct it. Extensive growth of population and traffic leads to many changes in the use and development of different types of bridges. Box and T-beam girders are most commonly used superstructure in case of bridges. In this research work, analysis and design of box and T beam girder has been performed using SAP2000 in order to find out the most suitable type of bridge superstructure. The main objective of this study is to compare the structural behavior, optimization of materials used in each component and cost comparison of box and T beam girder bridge. Previous research in this regard is based upon working stress method but this research follows limit state design. Detailed comparison shows that box girder is more suitable as compared to T beam girder even for shorter span in terms of structural stability and cost efficiency.
Highlights
Bridges play an important role in development because they have potential to reduce the transportation cost by saving the time
Complete bill of quantities (BOQ) for box and T beam girder bridge are prepared for the comparison of cost as shown in Table 6 and 7
Allowable stress design method supports the adaptation of T beam girder for shorter span and box girder for longer spans
Summary
Bridges play an important role in development because they have potential to reduce the transportation cost by saving the time. That’s why the demand of bridge structures has sharply increased these days. Owning to its aesthetic and structural importance, bridge superstructure has major influence on overall cost of bridges. Box and T beam girders are considered as the most suitable options for short and intermediate span of bridges. Previous researches in this regard are limited to utility of one of the available design methods. These studies rule out the comparative study in term of structural and economic pros and cons. The non-availability of comparative data of bridge structure using strength design method motivated us to carry out this research
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