Study On Constraction Control Of Concrete-Filled Steel Tubular Butterfly Arch Bridge

The main purpose of construction controlling of long-span concrete filled steel tube arch bridge are to make the final line shape and force satisfy the requirement of the design and the standard codes at the extremely extend as well as to ensure the security within the process of construction.This thesis introduces the monitoring and controls to the deformation and stress in each stage of construction, based on the the construction of Nanzhonghuan Bridge in Taiyuan, Shanxi. With a strict control strategy, the displacement changes of the bridge structure in each main construction stage and the stress developments of each control selection are monitored systematically and comprehensively. For instance, sedimentation of each monitoring point of the main girder(the arch ribs) during the course of dismantling supports of the main girder (the arch ribs) is measured, srain measure of the critical section of the main girder and the arch ribs during the course of drawing the booms is observed. marks on the key sections are arranged to control the geometric shape of the structural system and the stress in each construction stage. The safety of the bridge construction and the structure of the bridge corresponding to the design requirements are ensured.At last, the MIDAS/Civil was used to analyse the practical measurement in the whole processes of the butterfly concrete- filled steel tubular arch bridges. The result shows the practical measurement fit well to the theoretical value. So finite element modeling analysis data, which reflecting the construction actual stage, can be used in the construction process. In this way, the construction stage of the butterfly concrete-filled steel tubular arch bridges can get more accurate analysis data.