Research On Key Technology Of Stiffening Beam Erection Of Single Cable Plane Suspension Bridge

The single cable plane suspension bridge is a special structural form in the suspension bridge,which is different from the double main cable space suspender of the ordinary suspension bridge,and the stress characteristics are different from those of the ordinary suspension bridge.The single main cable is mounted on the longitudinal axis of the stiffened beam.Nor can a single suspender provide sufficient torsional constraints for stiffened beams.However,the single cable suspension bridge has been favored by the designers because of its beautiful shape,bright transmission force and simple form.With the continuous development of suspension bridge technology,single main cable suspension bridge is more and more appeared in people’s field of vision,and the related research is also improving.In this paper,the construction process of single cable plane suspension bridge is studied.The erection of stiffened beam of suspension bridge is the most important part in the construction process.Most of the stiffening beams of single cable plane suspension bridges built at home and abroad are jacking method and full hall support method,and the qu River landscape bridge is built on the qu River which needs to ensure navigation,so the jacking method and the full hall support method can not be used.In this paper,it is proposed that the stiffening beam can be divided into two kinds: tower span middle frame beam and span middle bridge tower beam by floating hoisting method,and the connection mode in the construction process of stiffening beam can be divided into rigid connection method,joint method and rigid joint method.The final state of the bridge will also be caused by a variety of reasons in the process of construction.The influence of elements.In this paper,the reasonable construction method of stiffened beam is analyzed from the following aspects:1、 the normal installation method is used to simulate the construction stage of single cable plane suspension bridge.2、 the finite element model of qu River landscape bridge is established by using MIDAS/CIVIL.Based on the reasonable bridge state,the whole construction process of the two schemes is simulated,which is from tower to span middle frame beam and from span middle to bridge tower beam,respectively.The changes of internal force of suspender,internal force of temporary connector,vertical displacement of main cable and stiffening beam,horizontal displacement of main cable saddle,inclination angle of main cable and distance between main cable and tower edge are analyzed.The wind stability of the main beam in construction is considered comprehensively,and the scheme of the middle frame beam from the bridge tower to the span is better.3、 for the better bridge tower span middle frame beam scheme,based on the error of sling length,the different cantilever length of stiffened beam,the influence of temperature,the temporary load in construction and so on,the factors such as the error of sling length,the different cantilever length of stiffened beam,the temporary load in construction and so on are further studied.Through the research of this paper,the optimal erection sequence of qu River landscape bridge is obtained.The research in this paper shows that the construction method of single cable plane suspension bridge is affected by many factors,and the most suitable construction method should be considered comprehensively.The effects of sling length error,cantilever length,temperature,temporary load and other factors on the construction process should be considered in the design and formulation of the construction scheme.