| The PC composite box girder with corrugated steel webs uses corrugated steel webs instead of traditional concrete webs.The excellent tensile properties of steel effectively solve the problem of cracking of traditional concrete webs,and the self weight is lighter than that of reinforced concrete,which makes this kind of bridge have great spanning support capacity.With the increase of span,its economic benefits in bridge technology and application are more obvious.In recent years,the construction and reconstruction of the multi span box girder bridge with corrugated steel webs has developed rapidly.It has a clear bearing force,light and beautiful appearance,and has a good prospect of design and application.Based on the test and inspection project of Shanxi bridge(55+100×4+ 55)m in the wtzx-2 bid section of Wencheng Taishun(Zhejiang Fujian boundary)highway in Zhejiang Province,the deformation of the rigid frame continuous composite box girder bridge is analyzed from different perspectives,in order to provide some references for the construction of the multi span corrugated steel web rigid frame continuous composite box girder bridge:(1)This paper briefly introduces the technical development history,mechanical characteristics,mechanical research status at home and abroad and the construction method of the box girder bridge with corrugated steel webs.(2)Using the finite element software,two node beam element is used to simulate,in which the steel web mainly bears the shear force,using the share ratio of steel web and concrete in the lining concrete,the steel web is equivalent to the connection between the steel web and the top and bottom plate of the concrete treatment,and the spatial model of the bridge is established.Considering the internal force and the line shape,the closure sequence and the pier beam connection mode of the Shanxi bridge are compared Research and analysis,and find the weak position in the process of monitoring and measurement.(3)Before the construction,numerical simulation is used to check and analyze the triangle bracket,pouring condition,hanging basket and floor bracket structure in the process of cantilever pouring construction.The triangle bracket,hanging basket and floor bracket should not only consider the requirements of strength and rigidity in the construction process,but also weld the stiffener at the stress concentration position,and control its stress level through structural measures Provide basis and guidance for construction and monitoring measurement.(4)According to the specific characteristics of continuous cantilever box girder construction of corrugated steel deck bridge,MIDAS / civil method is used to analyze the finite element simulation data of monitoring and measurement.The finite element model is established to calculate and analyze the stress of the next section and the height data of formwork elevation,and the comparison between the simulated measured valueof each section and the measured value of the previous section is made,According to the results of calculation and analysis,the construction stress of the next section is predicted,which provides the basis and guidance for the construction stress of the steel web plate bridge on site and the design of the linear control system on site,and realizes the smooth construction of the steel web rigid frame continuous cantilever composite box girder steel web plate bridge.(5)Combined with the key points and difficulties in other projects,this paper puts forward some applicable methods for the monitoring and measurement of the corrugated steel web rigid frame composite box girder bridge. |
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