预应力索对连续曲线箱梁桥受力的影响分析

Analysis of Influences of Prestressing Cables on Mechanical Behavior of Continuous Curved Box Girder Bridge

分别在箱梁顶、底板不同位置布置平弯索,并在箱梁腹板中不同高度布置竖弯(含平弯)索,计算分析不同布索方式对连续曲线箱梁的受力影响。结果表明,在箱梁顶、底板不同位置布置平弯索,会对梁体的位移和水平力矩产生较大的影响,而腹板内竖弯索主要影响梁体的竖向位移,同时顶板平弯索和在腹板内靠上布置竖弯索有利于减小扭矩,并使内外侧支座反力趋于均衡。

By respectively arranging the horizontal curved prestressing cables at different positions in the top and bottom slabs of a concrete continuous curved box girder and the vertical curved cables （horizontal curved cables are included） at different heights in the webs of the girder, the influences of the different ways of arrangement of the cables on the mechanical behavior of the girder are calculated and analyzed. The results indicate that the horizontal curved cables arranged at the different positions in the top and bottom slabs will have considerable influence on the displacement and horizontal moment of the girder while the vertical curved cables arranged in the webs will mainly cause influence on the vertical displacement of the girder. However, the horizontal curved cables arranged in the top slab and the vertical curved cables arranged close to the upper part of the webs are helpful to reduce the torsional moment and will make the reaction force of the inner and outer bearings tend to be equilibratory.