Mechanical Analysis And Monitoring In Construction Process Of A Long Span Steel-Concrete Combined Girder Bridge With Swivel Method

During the past decades,with the rapid development of rail transportation,the prestressed reinforced concrete composite-beam bridge has been widely used in construction of railway bridges with increasingly novel structure system,expanding complicated layout and progressively larger scale.However,because of the increasing accident in the long-span steel-concrete combined girder bridge construction process,the studies of the construction monitoring technology and the applications can ensure the safety of the structural constructions.This thesis is to study the construction monitoring technology based on the project of a long-span steel-concrete combined girder bridge on Anqing-Jiujiang high-speed railway,which is being in the construction.Firstly the detailed methods of the monitoring in steel-concrete combined girder bridge construction process at home and abroad are summarized.Secondly the main measuring methods of the deformation,stresses and the construction environmental in the construction process of steel-concrete combined girder bridge are introduced.In addition,the recent engineering examples of the bridge constuctions have been introduced and compared.Here,the long-span steel-concrete combined girder is constructed with the swivel method.In the thesis,the mechanical models for the bridge and auxiliary facilities in the construction were established firstly.Then the finite element method was used to analyze the stress and deformation status of the bridge and auxiliary facilities in construction.Moreover,the site test was done to monitor the high stress zone of the bridge and auxiliary facilities in the bridge construction.The high stress rigion of the structure was monitored according to the results of the finite element analysis and test,and the mechanical model and the stress strength of the bridge and auxiliary facilities in the construction process were evaluated and analyzed.Eventually,it is found that the computed results of the stresses of the focused members with finite element method are in agreement with the measured ones in the construction process.And the structural geometry and line-shape after the bridge construction conform with the requirements of the design,which guaranteed that the auxiliary facilities are safe and the steel-concrete combined girder bridge has good construction quality.