Focused on the problems of prefabricated prestressed concrete small box beams cambering at mid-span, FEM theory and orthogonal test method are applied to analyze the sensitivity of factors involving elastic modulus of concrete (E), effective prestressed force (P), environmental relative humidity (RH), beam-preserving time (T) etc, and approximate expressions for calculating camber of the prestressed concrete small box beam are obtained by stepwise regression method. The fitting precision can meet the requirements of the engineering design, and the study method can provide reference for prediction and control of main beam camber.
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Yue Zhang (2013) studied this question.