空腹式刚架拱桥支架卸落的合理施工程序与方法

Reasonable construction procedure and method of removing open spandrel rigid-framed arch bridge's scaffolds

针对目前满堂支架施工的空腹式刚架拱桥支架卸落过程研究较少的现状,以某钢筋混凝土空腹式刚架拱桥为工程背景,利用Midas/Civil有限元计算软件对空腹式刚架拱桥支架卸落过程进行了仿真分析。综合考虑落架过程中结构的应力和变形,依据多方案试算分析比较得出:不同的落架过程对落架完成后各控制截面的应力和位移影响有限;结构上缘应力在刚域区和拱腿支架卸落过程中的变化较大,结构下缘应力和结构位移在拱腿支架卸落过程中的变化较大;采用对称落架和从一侧向另一侧落架的计算结果相差不大,但对称落架所需时间短。与对称逐区域落架相比,对称逐跨落架具有施工连续的优点,建议采用。

At present,with less research on the removing process of open spandrel rigidframed arch bridge＇s scaffolds,a reinforced concrete open spandrel rigid-framed arch bridge is selected as the case study,the process of removing scaffolds is simulated by using the finite element software Midas/Civil.Considering the stress and deformation of the structure in the process of removing scaffolds,it is obtained according to the calculation and analysis of multiple schemes that different process of removing scaffolds has limited influence on the stress and displacement of each control section after completion of removing scaffolds.The upper edge stress of the structure changes greatly during the removing process of the rigid area and the arch leg＇s scaffolds,the stress and structural displacement of the lower edge of the structure change greatly during the removing process of the arch leg＇s scaffolds.There is little difference between the symmetrical removing scaffolds and one side to the other side,but the time needed for the symmetrical removing scaffolds is short.Compared with the symmetrical area by area,the symmetrical span by span removing scaffolds has the advantages of continuous construction,and it is recommended to adopt.