The Research On Combined Construction Method Of Main Arch Ring Linear And Stress Control

Many long-span concrete arch bridges have been built by different construction meyhod, such as cast-in-situ method, erection woth cableway and stiff skeleton construction method in china in nearly 30 years. Since the 1960 s of the last century, most foreign long-span concrete arch bridges adopted cast-in-cantilever method and the combination method of cantilever pouring construction and stiff skeleton. At the beginning of this century, three reinforced concrete arch bridges have been built with the domestic by cantilever pouring construction, but research on cantilever pouring construction method combined with stiff skeleton has not been carried out. This dissertation relies on Guizhou Province Department of Transportation projects "hanging pouring steel arch bridge design and construction technology research concrete box"(2011-122-034), with a main span of 210 meters Yelang Lake Bridge as the object of this study, which will be carried out as the following research work:①Based on collecting and arranging the domestic and foreign research results, the author reference to the control method and theoretical calculation and analysis which the cable-stayed bridge, continuous beam bridge and other bridge cantilever casting construction adopt. It is beneficial to carry out the research of reinforced concrete arch bridge with cantilever casting construction control methods and establish a set of suitable for reinforced concrete arch bridge cantilever casting construction control system.②According the process of Yelang Lake Bridge with method of Cantilever Casting construction, combined with low concrete tensile performance characteristics, a deeper research will be carried out of "stress prediction mechanism of control with forward analysis algorithm", hanging on to the main arch concrete pouring segment and the lower edge of stress as bound variables, combined with the current shaped section of cable force. In this way, we can get the tensioning buckle cable force of the feasible region, which can automatically determine the buckle cable tension by means of the feasible region and tension force(reverse the cable tensioning buckle, the entire segment once pouring a tension, grade placement, graded tension). Using ANSYS APDL language to develop the analysis program with the calculation of reinforced concrete arch bridge by cantilever casting and stiff skeleton of combination construction.③Carry out the mechanical analysis of skeleton construction and concrete casting stage outsourcing, and discuss the influence of outsourcing concreting of the main arch alignment and stress.