多次地震灾害调查显示,在纵桥向地震作用下,梁桥往往会发生伸缩缝的破坏、主梁的碰撞、主梁的落梁以及由主梁落梁碰撞墩柱而导致的整体性垮塌,其中主梁的落梁在地震灾害统计中占据了相当大的比例。以西部山区具有不等高桥墩的典型梁桥为研究对象,在桥梁的关键部位设置限位墩,通过有限元分析手段对桥梁的整体抗纵向地震性能进行了研究。结果表明:在连续梁桥中设置限位墩,虽然在一定程度上增大了主梁之间的碰撞,但是能够有效地减小墩梁相对位移和普通墩的墩底最大弯矩,并且在普通连续梁桥中,墩梁相对位移是随着墩高的增大而增大的,因此,应该尽可能地把限位墩设置在墩高较高的地方。同时,如果桥梁较长需要设置多个限位墩的时候,限位墩之间的间距则需要加以考虑。 Multiple seismic disaster surveys have shown that under the effect of longitudinal earthquake to the earthquake, the girder bridges tend to collapse the expansion joints, the main girder collides, the main girder falls and the whole collapses due to the main girder dropping beams colliding with the pier , Of which the girders of the beam in the seismic disaster statistics occupy a large proportion. Taking the typical bridge with unequal bridge piers in the western mountainous area as the research object, the limit pier is set up in the key parts of the bridge, and the overall anti-longitudinal seismic performance of the bridge is studied by means of finite element analysis. The results show that although the limit pier is set in the continuous beam bridge, although it increases the collision between the main beams to a certain extent, it can effectively reduce the relative displacement of the pier and the maximum bending moment of the pier. In ordinary continuous girder bridge, the relative displacement of pier and girder increases with the increase of pier height. Therefore, the pier with limit pier should be set as high as possible in pier height. In the meantime, if the bridge is long and needs to set a plurality of limit pier, the spacing between the limit pier need to be considered.