Analysis of structural force characteristics of crescent-shaped stacked arch continuous girder bridge

School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

^* Corresponding author: 83061709@qq.com; b2764507057@qq.com; c2183271282@qq.com

Abstract

Through the finite element analysis software simulation of Lankao Special Bridge (40+168+40)m down-loaded steel-tube concrete tie-arch stacked-arch continuous girder bridge and on-site measured data, the crescent-shaped stacked arch in the bridge and the overall structure of the whole bridge are analysed in terms of force characteristics and stability. (1) Using Midas/Civil finite element analysis tool, a series of suggestions and methods are proposed for the construction of geometric model, simplification of solids, selection of cell type, setting of load SC, loading application method and simulation of boundary conditions of the bridge, etc., which can be used as a reference for the construction of finite element models of similar bridges. (2) The force characteristics and stability of the crescent-shaped stacked arch ribs and the whole bridge are calculated and analysed with measured and simulated data. (3) On the basis of static test analysis, the local stress study and analysis of the boom rope force and anchorage block parts were carried out. The results of the study show that: the construction programme is more reasonable after construction of main girders, column supports and arch ribs assembled in sequence, and then the construction programme of second-phase constant load is more reasonable, and the construction programme meets the requirements of the stress and stability of the whole bridge; the strength, stiffness and stability of (40+168+40)m span top- bearing tie-stayed stacked arch bridge meet the requirements, and the crescent-shaped stacked arch ribs have better mechanical properties than those of traditional arch bridges.