根据单箱双室箱梁截面的变形,设计位移参数,导出横截面横向、竖向畸变角的变位模式;采用刚架或板件来模拟横隔板和横隔墙的计算简图,利用力学和有限元原理,推导出横隔板、横隔墙的抗剪刚度、剪切应变能;并将此方法的计算结果与商业有限元软件计算结果进行比较.结果表明：文中提出的计算理论与方法是正确和完整的,该方法与商业有限元软件的计算结果接近;文中计算方法较之商业有限元软件更加简便实用;横隔板、横隔墙的剪切应变能都随位移呈幂函数增加.文中还得出了单箱双室箱梁横隔板最优的开孔位置.

According to the sectional deformation of single-box double-cell box girder,some displacement parameters are designed,and the displacement modes of horizontal and vertical distortion angles of the cross-section are deduced.Then,the calculation diagrams of diaphragms and side walls are simulated by using rigid frames or plates,and both the shear strain energy and the shear stiffness of diaphragms and side walls are deduced based on the principles of mechanics and finite element.Finally,the proposed method is compared with the commercial finite element software.It is found that the proposed theory and method are both correct and complete,that the proposed method is superior to the commercial finite element software with similar calculation results,and that the shear strain energy of diaphragms and side walls increases with the displacement by a power function.In addition,the optimal opening position of diaphragms of single-box double-cell box girder is determined in this paper.