大跨徑波形鋼腹板連續(xù)剛構(gòu)橋受力性能研究
[Abstract]:The corrugated steel web bridge can greatly reduce the weight of the superstructure of the bridge, with the advantages of reasonable structure, beautiful shape and less engineering, etc., which has been accepted and applied more and more by the bridge engineers in our country. Qingxi Bridge (95 m 180 m 95 m),) is a continuous rigid frame bridge with extraordinarily large span waveform steel web plate. The research and construction of corrugated steel web bridges have been carried out in our country. However, due to the lack of systematic, perfect and scientific design theories and methods, the design and construction of corrugated steel web bridges are rare in China. Based on the actual design parameters of Qingxi Bridge in Guangdong Province, the static and dynamic analysis and calculation of continuous rigid frame bridge with large span waveform steel webs are carried out in this paper. The local fine finite element analysis of corrugated steel web was carried out. The results can be used for reference in the application of corrugated steel web in long span bridges. The main work of this paper is as follows: according to the relevant codes in China, the static analysis of Qingxi Bridge is carried out by using the finite element analysis method, and the dynamic characteristics of the whole bridge are analyzed, and compared with the common continuous rigid frame bridge. The results show that the static checking calculation of the whole bridge meets the requirements of the specification. Compared with the conventional continuous rigid frame bridge, the prestressed effect of the corrugated steel web continuous rigid frame bridge is higher, and the weight of the bridge is greatly reduced. This paper lists the first ten natural vibration periods and modes of the two types of bridges. By comprehensive comparison, it is concluded that the structural stiffness of the corrugated steel web bridges is lower, the natural vibration frequency is lower, and the seismic capacity of the structures is stronger, which is more suitable for the bridges with high seismic requirements. A detailed finite element analysis method is used to simulate the shear key. Shear bond is the basis of steel and concrete interaction, and is a very important component of composite structure. The shear bond of PBL is analyzed by nonlinear finite element method and compared with the code of composite structure in China. The results show that the PBL bond can fully guarantee the shear requirement, and has a high surplus degree, and the increase of span does not require the shear bond to be very high. Using single PBL bond and double PBL bond in different position of horizontal shear force can make the structural force more reasonable and economical. The nonlinear analysis of buckling of corrugated steel web was carried out based on simulation. The effects of geometry, beam height and web thickness on buckling mode and buckling stress were studied, and the results were compared with the theoretical formula. The results show that the theoretical formula is more safe when the plate reaches the elastic-plastic stage. The shear buckling strength of corrugated steel web is related to the shape of corrugation, and the influence of different factors on the buckling capacity of corrugated steel web is different. By setting the corrugated shape reasonably, the corrugated steel web can play an optimal working role.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:U441;U448.23
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