The Constrcture Control And Sensitivity Analysis Of Long-span Continuous Rigid Frame Bridge

Along with the rapid development of modern transportation industry in our country, the use of long-span continuous rigid frame bridge is more and more frequent, especially in the complex terrain of the western mountains.Because of using the cantilever construction method, long-span continuous rigid frame bridge can across valleys, rivers such as terrain well. But in its construction there are too much factors influencing the structure, lead to each construction stage of the structure and the design theory of state have deviation, eventually make all aspects of the construction not in conformity with the state of design, so the bridge construction monitoring is of great significance in the construction. This article main research content is as follows:First, a brief introduction to the concept, characteristics and construction methods of long-span continuous rigid frame bridge. At the same time discusses the importance of the construction control, as well as for bridge construction control research status at home and abroad.Second, briefly the content and the method for construction control, discuss the main parameters affecting the bridge structure construction at the same time, the introduction of the concept of sensitivity analysis.In the end, Moxigou bridge as an example, this paper discusses the Moxigou bridge construction monitoring content,methods and achievements, at the same time through the single factor sensitivity study various parameters on the sensitive degree of the structure’s linear, and determine the main parameters the secondary parameters to the design, according to the parameters of the single factor sensitivity analysis shows that the influence of bulk density of concrete to the influence of structure’s linear is very big, need to test each section analysis in the construction, make sure the real value of bulk density and make corresponding adjustment, ensure that the stress state and the linear of the bridge as same as the design state. The second impact on structure is the elastic modulus, compared with the concrete density and elastic modulus of the influence to the structure’s linear, Pipe friction coefficient, Deviation coefficient of pipe and Environmental humidity belong to secondary parameters design,have less influence to the structure’s linear. On the basis of single factor sensitivity analysis select Multiple composite to the double factor sensitivity analysis and exploratory research on the effect of each parameter combination on the influence degree of the structure’s linear.