Study On The Whole Process Of The Construction Monitoring Of The Yihe Extradosed Cable-stayed Bridge With Cast-in-place Reinforced Concrete Structure

Extradosed cable-stayed bridge combines the advantages of cable-stayed bridge and beam bridge performance,and has the advantages of convenient construction,good economy,more advanced technology,more choice of span,unique and beautiful bridge-type and being in harmony with the surrounding environment,which has attracted much attention in the field of engineering.It was widely recognized in the industry and has developed rapidly at home and abroad.To ensure the safety in the process of bridge construction and achieve the ideal state after completion of the bridge,the construction process of the extradosed cable-stayed bridge was needed to conducte construction monitoring.Taking Taoran road Yihe bridge of Linyi as an engineering project in this paper,the construction monitoring of extradosed cable-stayed bridge were studied,the specific contents are as follows:(1)The developmental general situation ? characteristics and advantages of extradosed cable-stayed bridge were introduced,and the purpose and significance of the construction monitoring of the extradosed cable-stayed bridge were summarized.(2)The contents and influencing factors of construction control were introduced.The construction control methods and construction control calculation methods were summed up.The adaptive control method was adopted from among construction control methods and the forward calculation method was adopted from among the construction control calculation methods for Yihe bridge.(3)The finite element model for Yihe bridge was established with the MIDAS/Civil software,the theoretical values of the structural forces and deformations at stage of construction and completed bridge were obtained,as well as theory value of the initial cable force.According to the theoretical calculation of the model,the elevation of formwork erection of the main girder was also obtained.(4)Sensitivity analysis and identification of the parameters of Yi River Bridgewere carried out.The main influencing parameters were obtained by analyzing the sensitivity of the parameters.The main sensitivity of the parameters were obtained by analyzing the sensitivity of the parameters.The main parameters were corrected by least squares method in the construction process,and the influence of secondary parameters were ignored at the same time,the calculation model will be more closer to the actual structure,The theoretical calculation values of the model in the process of construction control will be more accurate.The errors caused by temperature which was uncorrectable parameter can be directly corrected based on the results of temperature sensitivity analysis.(5)The monitoring objectives?principles and schemes of Yihe bridge were introduced,and the construction monitoring of Yihe Bridge was carried out.In the process of construction,the theoretical values of the main parameters were constantly adjusted taking into account of the error between actual measured values and theoretical values,so the theoretical values of the parameters will be closer to the actual values.The measured values of the structural stress and deformation of Yihe Bridge were close to theoretical values in the process of construction,and they have the same trend;The error between measured values and theoretical values of cable force is small,the error was in the allowable range;Good results were achieved by means of construction monitoring.The final completed bridge state meets the design requirements.In this paper,the construction monitoring of Yihe Bridge was introduced,With a view to providing relevant reference and useful reference for construction monitoring of similar bridge.