The Ultimate Bearing Capacity Analysis Of Long-span Reinforced Concrete Deck Arch Bridge

With the vigorous development of the traffic construction and the implementation of westerndevelopment strategy, long-span reinforced concrete arch bridge is wildly used in the westernregion of our country. It’s of great theoretical significance and practical value to study itsmechanical behavior during construction and ultimate bearing capacity under finished state.The recent research status of the ultimate bearing capacity of arch bridge at home and abroadis summarized, then the theory of stability, nonlinear analysis and nonlinear finite elementmethod is introduced in detail. Based on a reinforced concrete arch bridge named Ma Ti river,the cable force in cantilever construction process is optimized with the method of unknownload coefficient based on influence matrix provided by Midas/Civil, then, the sequence ofremoving the cables after the closure of main arch is studied, and its stability duringconstruction is also analyzed. With the use of software ANSYS, the first stability issue of thebridge under finished state, and the influence of different loading patterns, rise-span ratio andin-plane bending stiffness of arch ring is analyzed. The issue of elastic buckling, the secondstability (geometrically nonlinearity) and ultimate bearing capacity is also analyzed to studythe destroy process and failure mode of the bridge when its ultimate bearing capacity isreached. There are many factors affecting the ultimate bearing capacity of long-spanreinforced concrete arch bridge, which mainly include load patterns, structural designparameters, and initial geometric imperfections. Parameters analysis is conducted to find thekey factors affecting its’ ultimate bearing capacity and to provide great support to its’ designand construction.