Study Internal Force Of Curved Rigid Frame Bridge With Cantilever Construction Method

TAs the development of the mountain highway and road of urban, concrete curve rigid frame bridge has been rapid progress in recent years. And it can be well adapted to environmental constraint, smoothed the road and optimized the linear.TBased on introducing the development and theoretical calculation, as it commonly used cantilever construction method, this paper derives exact formulas of its internal force about construction phases in accordance with uniform cross-section beam and not equal one. The correctness of the formula is verified by using finite element method combined with practical examples. A curved rigid frame bridge is used as the background with the span arrangement (45m+75m+45m) of Qiaole road - Leshi line interchange project in Chancheng region of Foshan city. The whole construction process of curve rigid frame bridge is simulated and so the internal forces of curved bridge is drawn with the large space finite element program MidasT/Civil6.71T. As the bending-torsion coupling, the internal stress is about more complex, so stress complex section should be determined according to the associated literature and the method of finite element. On the basis of compared and selected method of applying the boundary force in the ansys10.0, solid element of Ansys10.0 is used to study stress complex area of pier beam joint region with the results of MidasT/Civil6.71T.The stress influence of the diaphragms and curvature radius is discussed and analyzed, then some universal and useful conclusions are appeared so as to guide the designation and construction. The important factors are analyzed such as the curving radiu, the ratio of side span and main span and the changes of pier height, which are significant impact on the internal force of curved rigid frame bridge in the completed status of the bridge. Consequently, we can accumulate some experience to choose the basic parameters for designing curve rigid frame bridge.