支座强迫位移法是一种在钢主梁桥合龙施工中常用的控制方法，但目前对于支座强迫位移法施工控制过程的理论研究基本处于空白。本文基于欧拉梁挠曲微分方程，采用积分法求解了支座施加强迫位移合龙和一次成桥两种状况的三跨连续梁挠曲闭合解，两种状况下所得的梁挠曲函数完全一致，证明了在弹性状态下基于强迫位移法合龙的梁式结构可实现理想一次成桥效果。最后，结合某三跨连续钢桁梁桥合龙工程实例，验证了强迫位移法在实桥合龙线形控制中的效果。该理论证明可为支座强迫位移法的工程应用和推广提供理论依据和技术参考。

The bearing forced displacement method is a widely used control method in the closure construction of steel girder bridges. However, the theoretical research on the construction process of the bearing forced displacement method still needs to be completed. In this paper, based on the differential equation of Euler beam deflection, the integral method is used to solve the flexural closure solution of a three-span continuous girder in two conditions, namely, the bridge completion and closure in stages and the one-time bridge completion. The beam deflection functions obtained in both conditions are identical, which proves that the ideal one-time bridge formation can be achieved by applying the bearing forced displacement method. Finally, with a closure construction application of a three-span continuous steel truss bridge, the applicability of the forced displacement method in bridge alignment control applications is verified. The theoretical proof can provide a theoretical basis and technical reference for the engineering application and promotion of the bearing forced displacement method.

重庆市永川区技术创新与应用发展(重点)项目(021yc-cxfz20004)；重庆市教育委员会科学技术研究计划项目(KJQN202201805)；重庆人文科技学院科学技术研究项目(JSJGC202201)；重庆人文科技学院科学技术研究项目(CRKZK2022006)