| The distribution of soluble rock in China accounted for more than 1/3, especially in the eastern part of Guangxi, Guizhou and Yunnan. For decades, with the development of the western region to promote the development of China’s infrastructure continues to develop, Guangxi’s traffic construction is also by leaps and bounds, Guangxi has built a large number of steel tube concrete arch bridge. Due to its lightweight and beautiful appearance, the steel tube concrete arch bridge has many merits such as low cost, low cost, convenient construction, convenient maintenance, strong spanning ability and so on. Our country is located in the Pacific plate, the Eurasian continental plate and the Indian Ocean plate extrusion, resulting in China is one of the most affected by the earthquake in India. At present, the main design method of building arch bridge in karst foundation is still using conventional design method or the experience method, which can make a difference in the actual situation, especially the seismic analysis of the building, it will cause more errors. Therefore, it is very important to study the seismic analysis of karst foundation, foundation and concrete filled steel tube arch bridge.In this paper, based on the research of experts and scholars, through the method of numerical simulation on the basis of the interaction between the foundation and the concrete filled steel tube arch bridge, the seismic research of the following aspects:(1) Summarize the research status of the domestic and international research, and summarize the research in the field of bridge. By referring to the relevant literature, to understand the engineering geology of karst area, the most notable feature is that the karst area is widely distributed in a large number of carbonate rocks, in which the red clay is the most representative of the soil. Based on the characteristics of karst foundation and possible geological disasters, the geological hazard risk assessment of karst areas is carried out, and the effect of the foundation diseases on the superstructure is evaluated.(2) The theoretical analysis method and the model of the interaction between the foundation and the superstructure are described. The method of the arch bridge seismic response analysis is described in detail. Finally, the finite element method is used to establish the model.(3) Use the large finite element analysis software ANSYS to establish the model which does not consider the interaction and the consideration, the foundation soil of the ordinary carbonate rock, under the action of EL-CENTRO seismic wave, the displacement, acceleration, bending moment and axial force of the key part of the arch bridge, the results show that the dynamic response of CFST arch bridge considering the interaction will be more obvious.(4) In the foundation soil of red clay, the model of the interaction of karst cave and karst cave is established. The results show that the calculation results of the arch bridge are generally larger than those of non karst cave. |
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