Experimental Research And Stability Analysis On Structure Of Concrete Thin Wall-High Pier Bridge

With the development of technology and transportation enterprise, the continuous rigid frame bridges develop rapidly and grow towards long span and more flexibility. Thin-walled high pier relevant aspects of the temperature field of theoretical analysis and experimental research is still relatively small, the general approach is the use of box girder temperature gradient model, but because the main beam of sunshine and the pier suffered radiation angle and the direction of different duration, simply copy the main beam temperature patterns do not reflect the true structure of high pier temperature distribution. On the other hand, with the increase of high pier, Span growth, its geometry and nonlinear material nonlinearity has become increasingly evident, the traditional linear elastic analysis method can not fully meet the construction needs.The text, aiming at the continuous rigid frame bridges, first displays the investigation status of the thin-walled and high-pier bridge at home and abroad, then introduces the stability theory and its finite element analysis, highlights the second stability issues and its nonlinearity finite element analysis. Beishan bridge, which was taken as an example in the paper, establishs the space nonlinearity finite element model of thin-wall and high-pier, combined concrete element with common reinforced element and prestress reinforced element by using the general program-Abaqus. Based on the experimental studies, the paper not only tests the temperature distribution of typical thin-wall and high-pier in the sunshine, but also initially studies the mode of temperature gradient of thin-wall and high-pier frame. After comparing the measured and standard propose temperature gradient mode on temperature effect of the thin-wall and high-pier. We get a result that the inner forced is less influced by the effects of measured temperature gradient mode. This article has carried on linear stability analysis and nonlinear stability analysis of the bridge largest cantilever. Which indicated that nonlinear of thin wall high pier structure is quite obvious, the common reinforced played the vital role in the concrete structure, the article has also explored the whole bridge to become under nonlinear stability analysis and study. The paper then analyses the nonlinearity stability influence of different usage of common reinforced and concrete material on thin-wall and high-pier. The conclusion is that the change of extremum stability coefficient nonlinearity was induced by the usage change of common reinforced, and the change of different concrete material results in the change of stability coefficient linearity. Finally, based on the volume data of high-pier bridge and the research results of this paper, it concludes achievements on the stability of concrete thin-wall and high-pier bridges, puts forward the safety coefficient propose when designing such kinds of high-pier bridge and gives some complementarity suggestions on the current design criterion.