| The steel-concrete composite beam cable-stayed bridge has achieved rapid development in recent years in theoretical research and engineering practice.In view of the linear error produced by the steel main girder in the manufacturing and installation process,the adoption of reasonable control measures is conducive to the construction and construction of the structure.A reasonable state is reached after the bridge is completed.This paper takes the Chibi Yangtze River Highway Bridge as the engineering background,based on the relevant calculation theory of the composite girder cable-stayed bridge,and according to the manufacturing and installation technology of the steel main girder,the cause,influence and control measures of its linear error are studied in detail.The content and work of this article are mainly divided into the following aspects:(1)The advantages and development history of composite beam cable-stayed bridges are introduced,and the current research status of composite beams in terms of calculation theory,section form,manufacturing and installation linear errors,and construction methods are summarized.(2)The geometric nonlinear effects such as the sag effect,the beam-column effect and the large displacement effect of the cable-stayed bridge are elaborated;the converted section method and the double-layer beam element method for simulating steel-concrete composite beams are studied respectively;The calculation method of the shrinkage and creep of the bridge deck in the composite girder and the related algorithm of the steel main girder manufacturing and installation line are analyzed.(3)Established a finite element model of the plane rod system of the Chibi Yangtze River Highway Bridge by using BDCMS software;calculated the manufacturing alignment and installation elevation of the steel main girder;in order to ensure the safety of the main girder,the construction process and the results were calculated according to the calculation data of the full bridge.The internal force of the composite beam in the bridge state is analyzed.(4)Described the main points of steel main girder factory manufacturing process and linear control;deduced the manufacturing error transmission formula under multi-process;combined with on-site pre-assembly data,obtained the beam length and included angle error of some steel main girder of the Chibi Yangtze River Highway Bridge Distribution;based on single-parameter sensitivity analysis,the influence of beam length and included angle error on the elevation of the main girder in the construction process is obtained;the adjustment method and control method of the linear error of the steel main girder are explored;according to the allowable manufacturing error and measurement error The necessity of pre-assembly of steel beams of Chibi Bridge was discussed.(5)The feasibility analysis of the two beam erection methods proposed in the early stage of the Chibi Yangtze River Highway Bridge,the hoisting of the steel beam integral section and the cantilever assembly of the loose parts,was carried out through finite element modeling.According to the on-site construction method of the steel main beam,the possible torsion,beam length and beam angle errors that may occur during the installation process are analyzed;feasible adjustment and control methods are proposed for the torsion,axis deviation,elevation and other errors;the north bank side span main beam The elevation error after erecting the auxiliary pier is analyzed and identified;finally,the effectiveness of the linear error control of the steel main girder is judged according to the actual closing alignment. |
PDF Full Text Request