Research On The Test And Torsion Deformation Of Prestressed Concrete Curved Box-girder

In traffic engineering, the prestressed concrete curved girder is widely utilized withthe advantages of unique bridge type and strong adaptability to the terrain. Beinginsufficiency in the calculation theory and mechanical characteristics research, thecurved girder may appear some quality of diseases in the period of the construction andthe operation. The prestressed concrete curved box-girder in this paper was as theresearch object, and the mechanical characteristics、the torsion deformation were studiedwith the aid of finite element analysis software on platform of ANSYS、the integrateduse of experiment and numerical methods, during the whole process were involved inthe real bridge construction. The following shows the main reserch works andconclusions:1. Based on the finite element analysis software ANSYS platform, spatial3D-soildelement and the combination of other spatial elements were adopted in finite elementmethod, and numerical modeling was established for prestressed concrete curved girder.During the prestressed stretching of the box-girder, compared with the results of thetests and the theoretical values indicate that the offered numerical model has agood performance in space mechanical characteristics for the curved bridge, which hasa certain reliability.2. In this dissertation, the loading test and numerical analysis are appliedsynthetically, and the girder section stress、deformation and the section stressdistribution are studied, meanwhile, this paper explores the effect of the stressdistribution in the curved box-girder section from the shear lag of the box-girder sectionand curvature radius. The results of the tests indicate that values are less than thecalculation values in the simulation and the stress of the main girders are in the range ofthe design allowable values.3. Based on the numerical simulation, study the torsion deformation of prestressedconcrete curved box-girder when the asymmetric design about prestressed steels in bothsides webs. Through simulation of the asymmetric design about the tensioning stressand location of webs prestressed steels, we know torsion deformation of bridges will bereduced evidently with the tensioning stress increases of the prestressed steels in outside webs or the height decreases of the prestressed steels in inside webs.4. Based on the numerical simulation, study the section parameter effected torsiondeformation of curved box-girder. The results show that the torsion deformation ofbridges will the increase of box girder section height、 width of bottom flange andthickness of top flange. The section height and width of bottom flange have a significantimpact on torsion deformation. And the torsion deformation of the bridge will bereduced with the increases of curvature radius.