Study Of Applied Arithmetic Of Ultimate Strength Of Concrete Filled Steel Tubular (Single Tube) Arches

Based on the summary of the completed four model tests of CFST ribbed arches, Through the method of analyze behavior of CFST (single tube) arch, Both the material and geometric nonlinear property are taken into account in the method, A fiber element model of stress-strain relation of CFST is used. Comparisons of numerical results with the test results indicate that, the method proposed herein can get out the basic mechanic behaviors of the steel tubular arch and CFST arch on the whole loading progress. The analyses of the nonlinear property of the CFST arch indicate that both the material and geometric nonlinearity take pole in the mechanic behaviors of CFST arch and the material nonlinear is more seriously than the geometric nonlinear.With the double non-linearity finite element program, whole behaviors of Concrete Filled Steel Tubular (CFST) arch bridges and their ultimate load-carrying capacity are analyzed. The parameters used in the analyses include rise to span ratio, slenderness ratio, steel ratio and load conditions. The results can be referred to put forward an applied arithmetic of the ultimate load-carrying capacity of CFST arch bridge and can be useful for practical engineering.Aim at the equivalent beam-column method to predict the planner ultimate load-carrying capacity of CFST (single) rib arch, The equivalent length, the applied load from which cross-section as the acted force and the calculation method of the ultimate load of CFST are discussed. Comparisons to the results from the dual-nonlinearity finite element method show that the predicted results by the equivalent beam-column method can follow basic rule of the ultimate loads in CFST (single) rib arch and can be refer to practice use.