预制节段式无粘结预应力混凝土箱梁受弯扭剪共同作用分析

SEGMENTAL BOX GIRDER WITH UNBONDED PRESTRESSED TENDONS UNDER COMBINED ACTION OF TORSION, BENDING, AND SHEAR

预制节段无粘结预应力混凝土箱型桥梁是一种在西方已推广的桥梁结构形式。它满足了人们使用工业化预制件快速施工的愿望。这种结构形式及施工方式可以节省大量施工时间并使施工不受天气影响。与有粘结预应力技术相比,无粘结预应力钢束一般有外保护层,可以防止由于混凝土开裂对预应力钢束的锈蚀损伤,保证结构的耐久性。本文针对预制节段无粘结预应力混凝土箱型桥梁受弯扭剪复杂作用力下的计算模型和破坏机理进行研究,并与德国步伦瑞克工业大学(TU Braunschweig)从事的试验结果相比较,证明了本文研究结果的正确性。

A segmental box girder with unbonded prestressing tendons under the combined action of torsion, bending, and shear is studied in the paper. The bridge has some advantages; it is widely used in Western. In order to develop this type of structures in China, the research of the bearing capacity and calculation module of such structure are introduced. The theoretical results are in good agreement with that of the test one. The test is carried out in the Technical University of Braunschweig, Germany. It is found that some conclusions are useful.