无缝桥加筋接线路面的拉伸变形性能

Tensile Deformation Performance of Reinforced Approach Pavement of Jointless Bridge

为减小接线路面中裂缝的离散性,在无缝桥加筋接线路面中引入等距离的预压缝,并设计了室内节段模型温降模拟试验,同时根据混凝土粘结-滑移理论推导了无缝桥加筋接线路面在纵向荷载作用下裂缝宽度的计算公式,并对试验观测值与理论计算值进行了对比。结果表明:裂缝宽度的理论值与试验值能较好吻合,初步验证了加筋接线路面的裂缝能呈规律性地发展,而且接线路面有良好的吸收变形性能,为无缝桥中带预压缝的加筋接线路面的设计提供了依据。

In order to eliminate the randomness of cracks,equidistant pre-compaction seams were introduced into reinforced approach pavement of jointless bridge.Then a scale model test was conducted.In the model,mechanical behavior of the reinforced approach pavement suffered from temperature falling was simulated.At the same time,based on concrete bonding-sliding theory,calculated formulas of crack width for the reinforced approach pavement under longitudinal loads were derived.Comparisons between the scale model test results and the results given by the derived formulas show that the two kinds of results agree well with each other.It means that the cracks can develop well under certain principle,meanwhile,the reinforced approach pavement can absorb deformation effectively.Hence,the derived formulas can be applied to the process of the design of reinforced approach pavement implanted with pre-compaction seams in jointless bridges.