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为解决大跨PC梁桥下挠问题,该文首次提出在施工阶段应用主动沉降法。对双肢薄壁墩、单肢薄壁墩刚构桥和连续梁桥边支座下沉的力学原理进行剖析,重点考察对主梁和主墩的受力影响,提出了边支座沉降量的控制原则,并通过实例进行分析说明。因边跨支点反力小易实施,主动沉降法能很好地应用于大跨PC梁桥并对跨中下挠有着很好的控制效果,沉降工况对主梁弯矩、剪力影响较小,对刚构桥主墩不利弯矩有一定增加,但量级不大。
In order to solve the problem of deflection of long-span PC girder bridges, this paper proposes for the first time an active settlement method in the construction phase. The mechanical principle of sinking of thin-walled piers with double limbs, rigid framed bridge with single-limb thin-walled piers and continuous support of bridge abutment is analyzed. The influence of stress on main girder and main pier is emphatically studied. The control principle, and through the example carries on the analysis explanation. Because of the small cross-bearing reaction force is easy to implement, the active subsidence method can be well applied to a large span PC girder bridge and has good control over the mid-span deflection, settlement conditions on the main beam bending moment, shear force Small, a rigid bridge rigid piers unfavorable bending moment has increased, but the magnitude is not large.