Mechanical Properties And Stability Analyses Of Curved Continuous Rigid Frame Bridge

With the development of transportation industry and west-development, curvedcontinuous rigid frame bridge with high pier has been commonly used in highland andmountainous area. However, in practical construction and operation, because calculation forcurved continuous rigid frame bridge is even more complicated, as the result of the fact thatmechanical properties are more complicate than straight bridge owing to the existence ofcurvature radius, there are still practical problems come up, which is the new subject proposedby engineers. Therefore, this essay is about mechanical properties and stability researches ofcurved continuous rigid frame bridge and relative conclusions, via studying one main bridgeon high-speed way.Firstly, after analyzing loading features, loading factors and calculating theory of curvedcontinuous rigid frame bridge in literatures, it is clear that there have been no mature theoriesand solutions that we can refer to in order to solve problems curved continuous rigid framebridge facing. Thus, in order to achieve regulations of curved continuous rigid frame bridge,we will proceed model analyses by using infinite element software basing on finite element.Then, basing on engineering designing protocol and MIDAS/Civil finite elementsoftware, eight finite element analysis molds with eight different curvature radius are set toanalyze bearing reaction, internal force and deformation rules, from which we draw theconclusion that curvature radius has great effect on bearing reaction, torsion，horizontaldisplacement and torsion angle deformation, but rare influence on bending, shear force,vertical displacement. Besides, when supervising operation of curved continuous rigid framebridge, we should notice influences caused by horizontal displacement and torsion angledeformation. Forced displacement of main pier has great influence on vertical displacement ofmain beam, while forced displacement of side-span support has great influence on mainbeam torsion, on the contrary, horizontal displacement, vertical displacement and torsionangle change are not rarely influenced. Therefore, in practical construction, avoidingsedimentation of side-span support, in particular of inside support, should be emphasized andfocused on. The fact is under slow effect of contraction force, internal force change anddeformation of main beam is in exponential curve, changing from fast to slow.Finally, basing on engineering designing protocol, bridge models with different radiusand loading situation are set to analyze influence on bridge stability caused by radius andloading situation. In this case, it is clear that in comparison of straight bridge and curved continuous rigid frame bridge, that later one has better stability, besides, influence causedby dead load is greater effect than live load, influence by temperature load is not indispensibleand influence by wind load influences is small.