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The diagonal crack in the webs of box-girder has been one of the most common diseases in long-span prestressed concrete box-girder bridges in recent years.One of the key reasons is the great prestress loss in the vertical prestressing tendons.In order to solve the problem,the authors propose a new type of anchorage system,namely,the Double-Tensioned Prestressing Steel Strands Anchorage System (DTPSSAS)(Figure 1).