I came across this problem last year. Although the issue has been solved, still I think we can share our views on this.
The problem occurred on 19m long pre tensioned PSC beam. The cracks, in the range of 0.2 mm – 0.5 mm, were noticed on the top flanges of the 19 m beams and near the two lifting positions of the each side ends of the beams as shown in the following figure.
|cracks positions of the beam|
|closed view of the cracks|
The crack positions, sizes and the propagation are almost identical in every beams at the site and I had my uncertainties on the structural integrity of the defected beams.
I would highly welcome your opinion on what next to do?