装配式混凝土空心板梁桥单板受力问题的数值解析

Numerical Analysis on Single Plate Loading Effect of Precast Hollow Plate Girder Bridge

借助空间有限元分析软件ABAQUS,分析了装配式空心板梁桥铰缝开裂对桥梁跨中截面荷载横向分布的影响,分析了单侧铰缝开裂、双侧铰缝同时开裂的情况,通过数据回归分析得到了跨中截面荷载横向分布系数随铰缝开裂长度变化的规律,采用等效面积法得到了出现单板受力现象的铰缝开裂临界长度值,分析得出了以下结论:对于单侧铰缝开裂情况,建议临界铰缝长度定为1.0L;对于双侧铰缝开裂情况,建议临界铰缝开裂长度约为0.67L。该研究成果为养护检查中定量化判定"单板受力"问题提供了技术依据,同时也为装配式混凝土空心板梁桥横向整体性加固试验研究提供了理论参考。

The finite element software ABAQUS is used to analyze the influence of hinge joint crack onmidspan sectional load transverse distribution coefferent of precast hollow plate girder bridge, including single-side crack and two-side cracks. The regularity of transverse distribution coefficient of midspan sectional load varying with hinge joint crack length is obtained by using data regression analysis. The critical hingejoint crack length for single plate loading effect is obtained by using equivalent area method, It is concluded that （ 1 ） the recommended critical crack length for single plate loading effect is 1. OL, while that for two-side cracks is 0. 67L. The result provided a technical basis for the quantitative assessment of single plate loadingphenomenon in the technical inspection practice of the bridge, and also offered a reference to the experimental research on the transverse retrofit techniques for the bridge.