中文摘要：

为研究连续箱梁混凝土开裂后的内力重分布和翼缘有效分布宽度的变化规律，制作了钢筋混凝土（RC）连续宽箱梁模型，并对加载至混凝土开裂这一过程进行了试验，研究了均布荷载作用下连续箱梁各控制截面应力及应变分布规律、翼缘有效分布宽度、挠度和抗裂性能变化情况。基于换算截面法，运用变分原理对开裂混凝土连续箱梁的剪力滞效应进行了分析，并与规范方法和试验结果进行了对比。考虑弹性支座的影响，对连续箱梁的内力重分布与变形进行了分析，分析结果与试验结果吻合较好。

英文摘要：

In order to research variation rule of internal force redistribution and effective width of flange for continuous box girder after concrete cracking, RC continuous box girder with wide flange was made and tested on the course of loading to concrete cracking. Some behaviors under uniform load were studied, such as stress and strain distribution rule, effective distribution width of flange, deflection and anti-crack performance at dominate section. Based on transformed section method, shear lag effect of continuous box girder was analyzed adopting variational principle, and compared with design code and experimental result. Internal force redistribution and deflection were analyzed considering elastic effect of support in RC continuous box girder and it agreed well with experimental result.