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By: Sunidhi Rajput
Student, Sir Chhotu Ram Institute of Engineering & Technology, Chaudhary Charan Singh University Campus, Meerut, Uttar Pradesh, India.
Prestressed concrete box girder bridges exhibit complex structural behavior due to various loading scenarios. Extensive studies, both experimental and numerical, have helped advance their use in engineering. The spatial stress in prestressed concrete box girder bridges, especially during construction and service phases, has been analyzed using shell cells, which provide more accurate tensile stress data than beam cells. The deck with the numerous hat section was evaluated in the current study for its deck type properties in single span, continuous span, and end span settings in accordance with the testing guidelines in AS/NZ 2327-2017. Research has demonstrated that the initial casting temperature is important in preventing cracks at pier tops. Furthermore, prestress loss and creep significantly affect the deflection ratio of the main and side spans. Transverse prestressing, widely studied through finite element analysis, is effective in reducing top plate transverse stress and deflection. The use of advanced composite materials, such as carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP) has been found to enhance the structural performance of reinforced concrete box girders (RCBGs), increasing load capacity by up to 78%. Additionally, finite element (FE) simulations and ferrocement reinforcement techniques demonstrate promising improvements in bridge performance. Despite these advancements, gaps remain in addressing the complex stress states during failure, and further analytical studies are needed to optimize material use.
Citation:
Refrences:
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