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箱梁桥拓宽设计时,新旧桥基础差异沉降引起的刚接翼缘板内力是新板设计和旧板验算的前提。为研究该项内力的简化算法,以某连续箱梁桥拓宽工程为例,基于变形协调原理分析了新桥基础不均匀沉降全部工况下刚接翼缘板的变形,按上拱和下挠2种情况分别比较得到刚接翼缘板横向两侧相对位移的最大值,并偏安全地将其简化。以简化值为荷载,结合梁模式,针对桥梁纵向不同位置分别提出了沉降引起的刚接翼缘板内力的简化算法。最后将荷载简化值和简化算法的内力与三维实体有限元法的计算结果进行对比,验证了简化算法的可行性和计算精度。
When the box girder bridge is broadened, the internal force of the rigid flange plate caused by the differential settlement of the new bridge and the old bridge is the precondition of the new board design and the old board checking. In order to study a simplified algorithm of this internal force, taking a widening project of a continuous box girder bridge as an example, the deformation of the rigid flange plate under all the conditions of uneven settlement of Xinqiao foundation is analyzed based on the deformation coordination principle. The two cases are compared to obtain the maximum value of the relative displacement of both sides of the flange plate just after, and to simplify it safely. Taking simplified value as load and combined beam mode, a simplified algorithm of settlement internal force caused by settlement is put forward separately for different longitudinal positions of bridge. Finally, the load simplified value and the simplified internal force of the algorithm are compared with the three-dimensional solid finite element method to verify the feasibility and accuracy of the simplified algorithm.