Low temperature load limitation of long Span Concrete truss composite arch Bridge

In order to study the load limiting method of long-span concrete truss composite arch bridge at low temperature, the finite element analysis of the operating force of a 138m truss composite arch bridge at low temperature was firstly carried out, including the deflection change and stress distribution caused by temperature. Secondly, the load characteristics of trucks on the bridge are analyzed and the lower limit load is analyzed based on WIM data. Finally, the analysis results show that the long-term deformation of the truss composite arch bridge under the action of temperature is m-shaped, and the structure has a large tensile stress at the junction of empty and solid sides in the middle of span and at the lower chord position at the double columns. This kind of bridge is very sensitive to the effect of temperature. The influence of vehicle load on the structure under low temperature should be paid attention to and the relevant load limiting method is proposed to provide reference for this kind of bridge.