Abstract
Aiming at the phenomenon of small size and concrete incompactness in the densely packed reinforcement in the web plate, the top plate, and between the prestressed reinforcement, concrete compactness coefficient was put forward based on the strength measurement principle using ultrasonic-rebound method. Based on probability theory, 2 methods are proposed to calculate compactness of the entire bridge. The compactness was calculated and concrete distribution regularity analyzed through ultrasonic-rebound test of 4 pieces of post-tensioned prestressed beams with variable sections. In addition, the influence of concrete compactness on cracking load and ultimate capacity was analyzed through the bending static test. The formulas are provided to calculate cracking load and ultimate capacity of prestressed beams with I-type sections taking compactness into consideration. Results show size and distributed reinforcing bars can influence concrete compactness which approximates normal distribution. The attribute method of compactness super limit and low limit, which takes equalizing value as the center with 95% guaranteed rate, can show concrete compactness better. It is more practical to consider concrete compactness in calculating resisting capacity.
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