| Due to it's magnificent appearance, long span and good stability, the Long span steel truss arch bridge has become frequently used in many bridges structure. But at present, litte literrature availabed about construction contral of Long-span steal truss arch bridge,especially the load analysis of a bridge operation stage and the bridge load test.As a steel truss arch bridge, witch belongs to the special bridge,it's load test has a special sighnificance,and also has technical complexity and difficulty to some degrees.So in this article,take the Yihe bridge as the engineering background,the main contents are as follows:(1) This paper summarizes the development and the current research status of construction monitoring of through steel truss arch bridge at home and abroad.the finite element method basic analysis theory of steel truss arch bridge. According to the bridge's design file, summed up the bridge structure characteristics and construction process.Using the Midas civil software to establish the model of the Yihe bridge, simulating the four key construction stages and analyze the internal force of the bridge in each stage,witch includes the Bridge's side span assembling, cantilever acrossing,the main arch closing and the final closure for the bridge deck.(2)Using the software to simulate the process of Yihe bridge's alignment, stress and strain in four key construction stages, And compared with the actual measured data to ensure that the actual state of bridge can meet the design requirements.For the proposed lifting scheme,further study the derrick tensioning construction monitoring technology.(3)Analyzing the load of the bridge operation stages by using the Midas Civil software to calculate the structure's displacement and stress in the four key construction stages.Appling the results in the load test to study the steel truss arch bridge's load test technology,such as list out the dynamic parameter values for the bridge's later study. |
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