拱脚变位与拱上结构作用下二次抛物线无铰拱内力计算

为求解拱桥墩台发生水平位移、基础不均匀沉降引起的拱桥拱脚相对位移对二次抛物线无铰拱产生的内力,以及拱上部结构施工吊装过程中,拱上结构重力作用下二次抛物线无铰拱的内力,通过结构分析,表明在大跨度拱桥工程中,应考虑拱脚变位的影响;就二次抛物线无铰拱而言,拱上结构施工吊装顺序对拱内力影响不大,但吊装全部完成时拱内力变化最大,应以该内力值作为计算依据。

Internal Force Calculation of Second-degree Parabola Fixed End Arch under Deflection of Arch Springing and Gravity of Superstructure

In order to solve the internal force of second-degree parabola fixed end arch produced by relative displacement of arch bridge due to abutment horizontal displacement and foundation uneven settlement,and that under gravity of superstructure during lifting,through structural analysis,the influence of arch springing deflection shall be considered in large-span bridge engineering.For second-degree parabola fixed end arch,lifting sequence of superstructure has little influence on internal force of arch,but internal force changes largely when lifting is completed,so this value shall be taken as the calculation basis.