Study On The Effect Of Defects On The Structural Performance Of Spherical Hinge And Study On The Wind Resistant Of Swing Bridges

The swivel construction has been favored by more and more builders because of its advantages of easy construction and uninterrupted traffic when it crosses the existing traffic line.It continues to improve the swivel construction process and analyzes the force of the swivel system during the swivel construction process Situation,the research on the wind resistance of the swivel system has become the research focus of many researchers.This article combines the construction of the Taihe Super Bridge across the Luofu Railway?60+100+60?m continuous beam swivel construction.The precision control,the effect of defects on the performance of the ball hinge and the wind resistance of the swivel bridge are studied as follows:?1?The precision control of the swivel system mainly includes the construction and installation precision control and the manufacturing and manufacturing precision control of the ball hinge.When the installation accuracy of the swivel system meets the specifications and construction requirements,the local depression of the lower ball hinge steel plate is established through the MIDAS FEA software Finite element model under four working conditions of 1/4,1/2,3/4 and defect-free,comparative analysis of the stress and deformation of the swivel system under the action of balanced load and eccentric load?eccentricity of 100mm?Situation:Under the effect of balanced load,when the lower ball hinged steel plate is partially depressed 1/2 or more,the contact position of the upper ball hinged steel plate with concrete,the main tensile stress of concrete is greater than 0.7f_ct=0.7×3.1=2.17MPa required by C50 concrete,not Meet the requirements of the code;under the eccentric load,the main tensile stress of some concretes is greater than 2.17MPa at the contact position of the spherical hinge steel plate and the concrete under the four working conditions.Under the balanced stress state and the eccentric load stress state,the stress of the steel plate of the ball hinge in the four working conditions is small,which can meet the requirements of the ball hinge.The maximum deformation of the swivel system is 1.02mm.It is reasonable to consider that the distance between the support foot and the slideway should not be less than 10mm,and should not exceed 20mm.?2?Study the adjustment of the elevation of the beam body after the completion of the swivel construction bridge.The analysis shows that when there is a certain angle tilt error in the installation of the lower ball joint,the elevation adjustment will be affected by the vertical rotation limit of the steel pin.The design proposes an improvement of the ball hinged steel casing—removal of the steel pin limit structure.Through the lifting of the steel pin limit,combined with the jack to lift the upper platform,the elevation of the beam body can be adjusted to meet the design and construction requirements.?3?The wind stability of the transverse bridge and the longitudinal bridge before the rotation of the swivel bridge?considering the static friction coefficient of the spherical hinge?and during the rotation?considering the dynamic friction coefficient of the spherical hinge?are studied.Considering that the friction coefficient of the ball hinge cannot be adjusted after the construction of the swivel system is completed,it is proposed to avoid the construction of the swivel bridge in windy weather?6 and above?to ensure the safety of the bridge against overturning.