中文摘要：

为了了解集中荷载作用下,连续直线单箱梁在弹性工作阶段的力学性能,利用有限元软件及有机玻璃模型试验对两跨连续直线单箱梁进行分析.在第一跨跨中施加不同的集中荷载,分析每跨跨中顶板与底板横截面的剪力滞效应.通过采集的试验数据分析得出：在不同集中荷载作用下,第一跨跨中顶板与底板出现剪力滞效应,第二跨跨中剪力滞效应微小,荷载大小对剪力滞系数影响不大.

英文摘要：

In order to investigate the elastic mechanical properties of continuous box girder subjected to concentrative load, a two-span continuous box girder bridge was chosen and both FEM software and model experiment were used to analyze it. At the middle of first span of the bridge, a series of concentrative loads were applied successively, the coefficients of top plate and bottom plate in both spans were calculated, respectively. The results show that： under a large variety of concentrative loads, there exist apparent shear lag effects on the top plate and the bottom plate of the first span in which the concentrative load was applied, and on the contrary, the second span in which no loads were applied has only a tiny effect of shear lag, and also the magnitude of load does not have great effect on the shear lag coefficients of the second span.