本研究以某在建先简支后连续T梁桥为背景，探究负弯矩区预应力张拉对翼缘板湿接缝受力性能的影响。通过施工过程监测与参数化数值模拟，分析了湿接缝的应力分布规律。为方便施工，背景工程先张拉预应力束、后浇筑纵向湿接缝。参数化分析在原有施工顺序（第一种）的基础上额外考虑了先浇湿接缝后张预应力（第二种）以及负弯矩区部分浇湿接缝再张预应力最后浇剩余湿接缝（第三种）两种工况。监测表明：施工中预应力张拉水平差异超10%，但湿接缝因后浇未受显著影响；湿接缝浇筑完成后其横向基本受压，纵向仅在横梁处呈低水平受拉（15με）；监测显示预应力张拉未直接增加湿接缝开裂风险。参数化分析表明：三种施工顺序下湿接缝都有一定的应力富余度。恒载作用下最大主拉应力依次为0.2MPa、1.9MPa和0.8MPa；且前两种在二期恒载后拉应力持续显著；而第三种，即分阶段浇筑湿接缝在二期恒载后拉应力依然较低，但施工过程较为复杂。以上结果可为同类结构施工过程受力分析及过程优化提供支撑。

This study investigates the effect of prestressing tensioning in the negative moment zone on the force performance of wet joints in the flange slabs against the background of an under-construction simply-supported and then continuous T-girder bridge.The stress distribution law of wet joints is analysed through construction process monitoring and parametric numerical simulation. In order to facilitate the construction, the prestressing bundles were firstly tensioned and the longitudinal wet joints were poured afterwards in the background project. In addition to the original construction sequence (first type), the parametric analysis considered two additional conditions: the joints were poured first and then prestressed (second type), and the negative moment zone was partially poured with joints, then prestressed and finally poured with the remaining joints (third type). Monitoring showed that: the difference in prestressing tensioning level during construction exceeded 10%, but the wet joints were not significantly affected due to post-casting; the transverse direction of the joints was basically compressed after casting, and the longitudinal direction was only tensed at a low level in the beams (15 με); the monitoring showed that the prestressing tensioning did not directly increase the risk of cracking of the joints. Parametric analyses show that there is a certain degree of stress redundancy in the joints under all three construction sequences. The maximum main tensile stresses under constant load were 0.2 MPa, 1.9 MPa and 0.8 MPa in order; and the first two tensile stresses continue to be significant after the second period of constant load; while the third one, casting wet joints in stages still has lower tensile stress after the second stage of constant load, but the construction process is more complicated. The above results can provide support for the force analysis and process optimisation of the construction process of similar structures.