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Construction of intermediate diaphragms is an extra cost financially and in scheduling. Practice of intermediate diaphragms in prestressed concrete bridges is still controversial, and the practice in each state is different. This paper presents a review of the state-of-the-art practice regarding intermediate diaphragms of prestressed concrete bridges. Through a critical review, issues regarding the intermediate diaphragm effects on bridge performance are discussed. It is found that the ways to model the intermediate diaphragms make a significant difference on the results, and it is crucial to quantify the actual stiffness contribution of the intermediate diaphragms. Through field inspections, more specific information has been acquired for the current practice in Louisiana. This information is of invaluable help for developing finite element analysis and for the research team to make sound recommendations regarding the practice of intermediate diaphragms. The presented information will also help other states in examining the functions of intermediate diaphragms and in developing their policies of practice.
Cai et al. (2007) studied this question.