| Because of its strong spanning capacity and beautiful shape,concrete-filled steel tubular arch bridge has been widely applied.But because of the influence of the ambient temperature,the internal force of concrete-filled steel tubular arch bridge will change,which may cause the void damage of the main arch rib.At present,the standard formulation and theoretical calculation of the temperature effect on concrete-filled steel tubular arch bridge is relatively backward.Therefore,this paper research the temperature effect of this kind of bridge.The main contents of this thesis are as following:(1)On the basis of available data and research achievements,this paper summarizes the structural pattern,stress characteristics and applications of concrete filled steel tubular arch bridge of the Nelson System.(2)Taking two railroad concrete filled steel tubular arch bridges during operation as the research object,the finite element model is established.The simulation analysis of the temperature effect is conducted.The stress changes of each member of the bridge under the action of temperature are studied and compared with measured data.(3)The analysis of temperature effect on concrete-filled steel tubular arch bridge with separation problem is studied.(4)According to the analysis of the influence of temperature,the detection measures are proposed to improve the durability of concrete-filled steel tubular arch bridges. |
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