Stress Analysis And Stability Analysis Of Launching Nose Made Of Bailey Panels In Bridge Construction With The Incremental Launching Method

Bailey panel is a structural component of quick assembling, invented in the wartimeand mainly used for fast erecting and repairing of temporary bridge. It has thecharacteristics of simple structure, convenient transportation, fast setup, large loadingcapacity, good interchangeability and adaptability. Then it is widely used in nationaldefense, war preparation, traffic engineering, municipal water conservancy engineeringpractice. The continuous bridge needs to cross the existing lines, in order to ensure thenormal operation of the lines, facilitate the construction of main beam body, increase andthe spanning ability. The main beam adopts different cast-in-place, the incrementallaunching method, which requires setting the guide beam before and after. In the designphase, the actual situation of the construction site is taken into account, with Bailey panelassembling the guide beam. This is different from the past practical application of Baileypanel. The Bailey panel is mostly used in bearing structure, bridge erecting machine,support or temporary bridge structure. If the Bailey panel is made into the steel guide beamin the construction of the incremental launching method, the structural design andcalculation is very special.This paper built the structure calculation model by using the Midas/Civil finite elementanalysis software, discussed some problems in the process of modeling the guide beamstructure assembled by Bailey panel, reasonably simulated the erection joint between theguide beam and the main beam, the connection between the internal components of theguide beam and the constraint conditions of the guide beam, analyzed various load cases ofthe guide beam which are possibly encountered in the pushing process, more accurately,intuitively got the internal force, the stress of the Bailey panel the bar of the guide beam andstructural stress characteristics. Through the simulation analysis of the whole constructionprocess, this paper finds out the stress pattern and characteristics of the guide beamstructure, it further puts forward the reasonable design and recommendations forimprovement. At the same time, for the other loads that may exist in the pushingconstruction method, this paper analyzes its effect on the stability of Bailey panel beam. Byusing the buckling analysis module of Midas/Civil finite element analysis software, this paper analyzes and calculates the buckling eigenvalue of each load and the form of bucklinginstability modal. This can improve the reliability of Bailey panel guide beam and provide ascientific basis for the construction practice.Analysis shows that the stress and deformation of the guide beam are controlled byself-weight, and that the self-weight of the main girder beam is much larger than Baileypanel guide beam, so, when the cantilever of the main girder beam is larger, the end has alarger deflection and rotation, the end members of the guide beam have a larger internalforce and stress. With the increase of the bridge span ratio, the control effect of dead load ismore obvious. At the same time, the study finds that the joint force and coordinationdeformation of the two limbs of the guide beam are critical to ensure the sufficient strengthand stiffness of the two limbs of the guide beam with lateral connection.Currently, the relevant theory and research on the incremental launching method ofguiding beam assembled by Bailey panel is still relatively inadequate.This paper analyzesthe stress characteristics and stability of the Bailey panel guide beam, hoping that it may fillup the gap in its research and provide some reference for the design and constructionpractice.