Construction Control And Cable Force Optimization Analysis Of Double X-arch Bridge

The stress and the structure of double X-arch bridge is complex,with the obvious spatial effect.To ensure the safety of the construction of bridges and quality,the construction work on the construction of double X-archbridge must be carried out.And one of the important issues in the design and construction processlies in how to effectively confirm thereasonable cable force of finished state and that during construction,it can make the structurestress properly.Taking Meishan Nan Road bridge as engineering background,this paper has carried out the construction monitoring work of this bridge,and research analysismethod of double X-arch bridge reasonable cable force of finished state and that during construction.The main work and conclusions are as follows.The features and application of concrete filled steel tubular arch bridge was been introduced briefly in this thesis,focusing on the research results doubleX-arch bridge summarized.Thesignificance and main methods oflarge-span bridge construction control were been summarized.According to the characteristic and construction technique ofthe doubleX-arch bridge,build thebridge space finite element modeling and analysis calculated.Based on the calculation,internalforces,displacement values of structure and suspender force are given.A detailed bridge construction scheme was made.By the practice of the bridge construction control,the deformation and internal forces of the bridge were been underthe design request.From the practice of the bridge construction control,the purpose of the construction control of the double X-arch bridge has been achieved.Reviewof the common cable force optimization method,and briefly summarized the researches of determination ofdoubleX-arch bridgecable forces from domestic and foreign.For doubleX-arch bridge has obvious spatial effect,the dissertation proposes a cable tension optimization method,combining neural network and genetic algorithm.A BP neural network and genetic algorithm combineddoubleX-arch bridgecable tension optimization method steps were given in this paper.Andintroducedthe principles and steps of optimization by the BP neural network and genetic algorithm in detail.Combined with the engineering background,orthogonal design of orthogonal experiment method oftraining samplesof the BP network,the cable tension value was taken as the input of BP network,some important cross-section of stress were taken as the output.For establish the nonlinear relationship between cable tension parameters(input values)and structural changes in response(output values),neural network train the input samples and output samples.Then combined with genetic algorithm(GA)tofind out the optimal cable force.The optimized cable force was brought into the finite element model calculation and analysis in reverse.Compare the results which calculated bythe optimized cable force and the designforce.The results showed thatusingthis cable force optimization method is reasonable and effective,not only make the structural stress statemoreuniform and reasonable,but also good for the long-term operation ofbridge.In this paper,the establishment ofdoubleX-arch bridge finite element model,the combination of BP neural network andgenetic algorithm was applied to thedoubleX-arch bridgecable force optimization problems,obtained satisfactory resultsshowed that this method has a certainvalueon the optimization problemof doubleX-arch bridge design and construction work.