Box Girder With Corrugated Steel Webs Of Large Cross Section Segment Model Test

Corrugated steel web plate combination of prestressed concrete girder bridge is one ofcommon style in the modern bridge structure, it has the advantage of the high efficientprestressed concrete, light weight, convenient construction, and attractive appearance, dueto its good mechanical performance, many countries have a wide range of application andresearch.Through literature search,we found that the relevant test of corrugated steel web PCcomposite girder bridge has been carried out both at home and abroad, including ofcorrugated steel web PC shear properties and flexural properties of composite bridge,torsional distortion performance, fatigue performance and the connection of the bearingcapacity of the shear connector, with the development of the corrugated steel web plate, thecross section width increases gradually, based on the research of corrugated steel web platebox girder bridge at home and abroad, the selection of a shearing section at the corrugatedsteel web plate box girder bridge with heavy section, top tray is16.05m wide,baseboard is9m wide, web space is the biggest in these bridge. Therefore, through the segment modeltest,we reasearch the transverse flexural bearing capacity.Based on the theory of model scale, the real bridge cross section in the model is madeby the proportion of1:5scale. for the convenience of the test data analysis, the experimentselected four corrugated section as the experimental study on the object. In order tofacilitate loading and at the same time to make real bridge stress state and stress modelfitting, the thesis carries out the concept of longitudinal effective distribution width of thecurrent specification given in the effective distribution width of the concrete box girder iscalculated by using the experiential formula, now has not formed specification, because ithas different constraints between the model support moment of corrugated steel web plateof bridge panel and concrete web, in this paper, effective distribution width is calculated bythe finite element model, it found that the specification exists obvious difference betweenformula results and the finite element results, then the real stress state of bridge undervehicle load is simplified finite element of effective distribution width value plate width onthe line load for the unit width, and use influence line principle will load into two lines loadmultiple line, so it is easy to test the symmetry of the load and control load value Respectively analysising on the two test model of middle-loaded and unbalanceloading condition, in the middle-loaded conditions, when load level at55kn, model cracksbegan to appear in the edge of roof, the wing plate and the roof across the displacement inthe absolute value of ratio of2.66, web plate stress and the maximum is66.6Mpa, webplate at the top, middle, bottom stress ratio is1.06/2.03/1.93, the maximum stress occurs onthe top of the web; Under unbalance loading condition, when the load level in the135kn,the model of load side top corner cracks began to appear, the wing plate and across the roofdisplacement in the absolute value of ratio of0.67, maximum stress reached to-40.3Mpa.Through static load test of the big cross section corrugated steel web plate section, forthe horizontal stress has carried on the theoretical and experimental analysis, the test loadshould be respect to the real bridge, the real bridge bridge panel in the three lanes of vehicleload under partial load working arrangement (not included in the coefficient of combinationwith other load), the bridge safety stock value4.2/4.8, respectively, the cross section oftransverse stress in the reserve is very sufficient, satisfies the requirement of bridgestructure normally using.