Analysis of mechanical characteristics of a new aluminum alloy pedestrian bridge structure
At present,the aluminum alloy bearing bridge is not widely used,taking the first aluminum alloy footbridge in Fuzhou as the back-ground,the finite element model of the bridge is established,and the structural stress characteristics of the new aluminum alloy footbridge are explored through the analysis of the stress conditions under various working conditions.The results show that the overall force of the structure can meet the standard requirements after the quality of machining and construction is strictly controlled.In a variety of working conditions,the axial force of the upper and lower chords at the middle span of the main span of the structure is larger than that at the middle span of the side span with small span is about 30 percent larger.At the same time,the bending moment of the lower chord at the support of the structure is larger than that at other positions under various working conditions,which should be paid more attention to in the later de-sign.When the structure is subjected to a variety of working conditions,the maximum displacement of the structure is only 13.4mm,which meets the requirements of the specification.At the same time,the displacement of the structure varies with different degrees when the load changes.The safety factor of the structure under the existing constant load and various live load distributions is greater than the specified value,which meets the safety requirements.