根据大型多槽式矩型渡槽槽身结构及其受力特点，采用结构力学法使复杂的空间结构分离成相互联系的两个平面问题：横向计算时，横梁底部弹性支承在各纵梁上，根据力法位移协调理论，给出了双槽式和三槽式渡槽横向结构弹性支承反力的计算公式，并依此求得结构的横向受力与弹性支承反力；以弹性反力作为荷载，反向作用于纵梁上，从而进行纵向梁的受力分析。通过三维实体有限元软件（MIDAS)对某大型三槽式渡槽单跨槽身整体进行了建模分析，并将结构力学法和有限元法计算所得结果进行了比较分析，验证了方法的合理性和公式的准确性。利用其进行渡槽结构计算，能满足工程设计的精度要求。

According to the structure of large-scale multi-troughs rectangular aqueduct and its mechanical characteristics, the structural mechanics method was applied to decompose the complicated space structure into two connected plane problems. In the lateral calculation, the beam bottom was supported by the longitudinal beams. According to the displacement coordination theory, the elastic supporting force calculation formula of double and triple troughs were proposed, and the lateral force and the elastic support force of the structure can be obtained. The elastic supporting forces were regarded as loads and acted reversely on the longitudinal beams, and then the forces on the longitudinal beams were calculated. The solid 3D finite element software (MIDAS) was adopted to simulate the triple-troughs rectangular aqueduct, and the results obtained from the finite element model and the structural mechanics method were compared, which verified the reliability of the proposed method and accuracy of the formula. Consequently, the method used to calculate the aqueduct structure can meet the accuracy requirements of engineering design.

长江学者和创新团队发展计划资助(IRT1139)；国家自然科学基金项目资助(10902045)