中文摘要：

工程中普遍存在的剪力滞问题可能导致工程结构构件发生大变形以致严重损坏,对工程安全造成极为不利的影响.为了深入研究其作用机理,通过构建抛物型偏泛函模型,利用偏泛函微分系统对双室组合箱梁进行了推导研究.求得了在特殊外荷载（跨中集中荷载）下的特解,进一步得到了4种模式下的剪力滞偏泛函系数表达式.并从混凝土材料参数、钢梁材料参数等影响因素出发,选取模型结构,对该类型双室组合箱梁进行了参数特性研究以及对比分析.通过该研究,可为薄壁箱室结构的设计计算提供一定的指导作用和参照价值.

英文摘要：

The shear lag effects caused large deformation and significant damage of some structural members in engineering,and had unfavorable influences on engineering safety.To deepen the understanding of the shear lag mechanism,the partial functional differential system for steel-concrete composite double-cell box girders was proposed through introduction of different parabolic partial functional modes.In turn,the particular solutions of the differential system were obtained under a specific load（the span-center concentrated load）,and the shear lag coefficients under 4 modes of partial functional expressions were also calculated.As for different concrete material parameters and steel material parameters,the shear lag characteristics of the double-cell box girder examples were comparatively studied.This work provides some reference for the design and calculation of thin-wall box girders.