| The main bridge of the Inner Lake Bridge in Liaodong Bay District of Panjin City is a combination system of tandem arch and continuous beam of 31 m + 62 m + 200 m + 62 m + 31 m,in which the main span is a 200 m medium bearing steel box tie arch bridge.The large tonnage arch needs to be divided into two parts through the positive angle vertical rotation method in place,and then constructing the closed section.The height of the lifting tower is 87.8m in the vertical construction.Therefore,it is particularly important to turn the system and lift the safety and stability of the tower during the swivel process,so research and analysis must be carried out to ensure the safety of the swivel construction process.Carry out the tension of the rod tie after the main arch is closed and the main beam is assembled,a reasonable boom tension program for the arch bridge force has a vital significance.In this paper,the finite element model of the construction stage of the main bridge is established by using the finite element analysis software Midas Civil.The safety of the construction process is analyzed.The finite element software ANSYS is used to model the lifting tower.The finite element method of dynamic stress-free state finite element method based on stress-free state control theory is applied to the vertical swivel arch construction process of arch ribs.The minimum strain energy method is used to calculate the reasonable cable boom force of the arch bridge,And apply it to the construction control of Inner Lake Bridge.Specifically do the following work:Firstly,Introducing the engineering profile and construction steps of the Inner Lake Bridge.The dynamic stress-free finite element method is used to analyze the swivel process of the arch ribs.The results show that the buckling and back-cable tension,and develop a tension control program of vertical swivel process of arch ribs.At the same time,the structure is assumed to be rigid body,and the cable force of the buckling and back-cable is calculated by the geometric relation and the equilibrium equation.The results of the two methods are compared with the measured data.It is proved the accuracy of dynamic stress-free finite element method.Secondly,the analysis of the force of the arch ribs in the process of swivel is carried out.It is decided to install the temporary tie bar when the ribs are off the holder,reduce the stress of the ribs in the process of swivel and improve the shape of the ribs.The stability of the tower is studied by considering the double nonlinearity linearity,and the influence of the wind cable on the stability of the tower is studied.The results show that the wind cable can improve the stability factor of the tower under the wind and transverse bridge increased by 8.0% and 9.1%,so we decided to increase the cable system by the wind cable.At the same time,the characteristic buckling problem of arch ribs in the process of swivel is analyzed to ensure the safety of the stability problem in the process of swivel.Finally,the finite element model is established with Midas Civil,and the boom tensioning scheme of the main bridge is studied and analyzed.The minimum strain energy method is used to determine the reasonable bridging force of the Inner Lake Bridge,and the minimum strain energy method is used to calculate the tensioning method.The influence matrix method is used to calculate the post-tuning work,The amount of the method to control the cable construction,given the two methods to calculate the amount of anchor cup pull out,and its application in the Inner Lake Bridge boom construction,obtained in line with the requirements of the cable The results of the method demonstrate the accuracy of the method. |
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