Analysis of Key Mechanical Properties of Rotating Construction of Ultra-Wide and Overweight Curved Viaduct
Taking the rotating construction of a curved T-frame beam with a single width of 36.5 meters and weight of 20 000 tons in Northwest China as the research object,a finite element model was established to study the deformation of the bridge superstructure,the load on the cap and the temperature effect of the cap under the condition of large temperature difference,and to conduct a reasonable assessment of the construction safety risk.The results show that the large horizontal pressure at the end of the circular contact surface of the upper and lower ball hinge will lead to the main tensile stress in some areas,and the tensile stress can be reduced or eliminated by increasing the radius of the ball joints or decreasing the height of the ball joints.The rotating ball hinge has a great influence on the deformation of the cantilever beam.When the unbalance weight is controlled within0.8%,the influence can be better reduced.The maximum tensile stress caused by the temperature stress of the cap meets the needs of the code limit.
ultra-wide and overweight T-framerotating constructionrotating ball hingelarge temperature differencedeformationnumerical analysis
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