二次负弯矩预应力筋的张拉和临时支座的拆除是先简支后结构连续体系桥梁施工的关键工序,不同的施工顺序会对结构内力产生不同影响。通过4跨50mT梁的具体工程实例,对二次负弯矩预应力筋的张拉和临时支座的拆除不同的施工程序进行计算分析。分析表明:梁端湿接缝的预应力张拉顺序对结构内力产生一定的影响,临时支座的拆除顺序也会对结构内力产生一定的影响。 Tensioning of secondary negative moment prestressing tendons and removal of temporary supports are the key processes for the construction of bridges with simply supported and post-structural continuous systems. Different construction sequences will have different effects on the internal forces of structures. Through the concrete engineering examples of 4 span 50mT beams, the different construction procedures of the tensioning of the secondary negative moment prestressing tendons and the removal of the temporary supports are calculated and analyzed. The analysis shows that prestressed tension sequence of the wet joints at the beam end has some influence on the internal force of the structure, and the removal order of the temporary bearing also has some influence on the internal force of the structure.