大跨度连续梁桥转体球铰受力分析

Force Analysis of Rotating Spherical Hinges in Long-span Continuous Beam Bridges

摘要:

桥梁平转法以其施工方便、快捷、对既有线路影响小的特点在跨越既有线桥梁建设中应用越来越广泛。桥梁转体施工的关键在于下部的球铰结构，球铰结构在桥梁转体过程中承受较大的压应力。为了研究转体结构在转体施工时的受力情况，通过弹性力学理论分析以及有限元数值分析对转体球铰结构最大压应力进行了对比计算分析，并详细分析了转体结构各部分的应力分布。结果显示：理论分析表明下部球铰最大压应力为15.54 MPa，有限元分析最大主压应力为15.40 MPa，二者吻合较好；有限元分析结果显示上、下球铰压应力总体处于较大的压应力水平，呈现出中间小、边缘大的特点。

Abstract:

The flat turning method of bridges is increasingly widely used in the construction of bridges spanning existing lines due to its characteristics of convenient and fast construction and minimal impact on existing lines. The key to the construction of bridge rotation lies in the lower spherical hinge structure, which is subjected to considerable compressive stress during the bridge rotation process. In order to study the force conditions of rotating structures during rotating construction, the maximum compressive stress of the rotating spherical hinge structure is comparatively calculated and analyzed through the analysis of elastic mechanics theory and finite element numerical analysis, and the stress distribution of each part of the rotating structure is analyzed in detail. The results show that the theoretical analysis indicates that the maximum compressive stress of the lower ball hinge is 15.54 MPa, and the maximum principal compressive stress of the finite element analysis is 15.40 MPa. The two match well. The finite element analysis results show that the compressive stress of the upper and lower ball hinges is generally at a relatively large compressive stress level, presenting the characteristics of being small in the middle and large at the edge.